Population Dynamics: The pattern of any process, or the interrelationship of phenomena, which affects growth or change within a population.Chytridiomycota: A phylum of fungi that was formerly considered a subdivision of Phycomycetes. They are the only fungi that produce motile spores (zoospores) at some stage in their life cycle. Most are saprobes but they also include examples of plant, animal, and fungal pathogens.Falconiformes: An order of diurnal BIRDS of prey, including EAGLES; HAWKS; buzzards; vultures; and falcons.Extinction, Biological: The ceasing of existence of a species or taxonomic groups of organisms.Conservation of Natural Resources: The protection, preservation, restoration, and rational use of all resources in the total environment.Endangered Species: An animal or plant species in danger of extinction. Causes can include human activity, changing climate, or change in predator/prey ratios.Amphibians: VERTEBRATES belonging to the class amphibia such as frogs, toads, newts and salamanders that live in a semiaquatic environment.Population Density: Number of individuals in a population relative to space.Otters: Fish-eating carnivores of the family MUSTELIDAE, found on both hemispheres.Ranavirus: A genus of IRIDOVIRIDAE which infects fish, amphibians and reptiles. It is non-pathogenic for its natural host, Rana pipiens, but is lethal for other frogs, toads, turtles and salamanders. Frog virus 3 is the type species.Ranidae: The family of true frogs of the order Anura. The family occurs worldwide except in Antarctica.Ecosystem: A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)Birds: Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.Bufonidae: The family of true toads belonging to the order Anura. The genera include Bufo, Ansonia, Nectophrynoides, and Atelopus.Sea Lions: A group comprised of several species of aquatic carnivores in different genera, in the family Otariidae. In comparison to FUR SEALS, they have shorter, less dense hair.Anura: An order of the class Amphibia, which includes several families of frogs and toads. They are characterized by well developed hind limbs adapted for jumping, fused head and trunk and webbed toes. The term "toad" is ambiguous and is properly applied only to the family Bufonidae.Nesting Behavior: Animal behavior associated with the nest; includes construction, effects of size and material; behavior of the adult during the nesting period and the effect of the nest on the behavior of the young.Geography: The science dealing with the earth and its life, especially the description of land, sea, and air and the distribution of plant and animal life, including humanity and human industries with reference to the mutual relations of these elements. (From Webster, 3d ed)Animal Migration: Periodic movements of animals in response to seasonal changes or reproductive instinct. Hormonal changes are the trigger in at least some animals. Most migrations are made for reasons of climatic change, feeding, or breeding.Climate Change: Any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). It may result from natural factors such as changes in the sun's intensity, natural processes within the climate system such as changes in ocean circulation, or human activities.MycosesAnimals, Wild: Animals considered to be wild or feral or not adapted for domestic use. It does not include wild animals in zoos for which ANIMALS, ZOO is available.Fisheries: Places for cultivation and harvesting of fish, particularly in sea waters. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Genetic Variation: Genotypic differences observed among individuals in a population.Urodela: An order of the Amphibia class which includes salamanders and newts. They are characterized by usually having slim bodies and tails, four limbs of about equal size (except in Sirenidae), and a reduction in skull bones.Environment: The external elements and conditions which surround, influence, and affect the life and development of an organism or population.Trees: Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches.Reproduction: The total process by which organisms produce offspring. (Stedman, 25th ed)Microsatellite Repeats: A variety of simple repeat sequences that are distributed throughout the GENOME. They are characterized by a short repeat unit of 2-8 basepairs that is repeated up to 100 times. They are also known as short tandem repeats (STRs).Seasons: Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Biodiversity: The variety of all native living organisms and their various forms and interrelationships.Species Specificity: The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.Genetics, Population: The discipline studying genetic composition of populations and effects of factors such as GENETIC SELECTION, population size, MUTATION, migration, and GENETIC DRIFT on the frequencies of various GENOTYPES and PHENOTYPES using a variety of GENETIC TECHNIQUES.DNA, Mitochondrial: Double-stranded DNA of MITOCHONDRIA. In eukaryotes, the mitochondrial GENOME is circular and codes for ribosomal RNAs, transfer RNAs, and about 10 proteins.Phylogeny: The relationships of groups of organisms as reflected by their genetic makeup.Bayes Theorem: A theorem in probability theory named for Thomas Bayes (1702-1761). In epidemiology, it is used to obtain the probability of disease in a group of people with some characteristic on the basis of the overall rate of that disease and of the likelihood of that characteristic in healthy and diseased individuals. The most familiar application is in clinical decision analysis where it is used for estimating the probability of a particular diagnosis given the appearance of some symptoms or test result.Time Factors: Elements of limited time intervals, contributing to particular results or situations.EuropeModels, Biological: Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.Aging: The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.Cognition Disorders: Disturbances in mental processes related to learning, thinking, reasoning, and judgment.Longitudinal Studies: Studies in which variables relating to an individual or group of individuals are assessed over a period of time.Neuropsychological Tests: Tests designed to assess neurological function associated with certain behaviors. They are used in diagnosing brain dysfunction or damage and central nervous system disorders or injury.Cognition: Intellectual or mental process whereby an organism obtains knowledge.Age Factors: Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time.Disease Progression: The worsening of a disease over time. This concept is most often used for chronic and incurable diseases where the stage of the disease is an important determinant of therapy and prognosis.Alzheimer Disease: A degenerative disease of the BRAIN characterized by the insidious onset of DEMENTIA. Impairment of MEMORY, judgment, attention span, and problem solving skills are followed by severe APRAXIAS and a global loss of cognitive abilities. The condition primarily occurs after age 60, and is marked pathologically by severe cortical atrophy and the triad of SENILE PLAQUES; NEUROFIBRILLARY TANGLES; and NEUROPIL THREADS. (From Adams et al., Principles of Neurology, 6th ed, pp1049-57)Dementia: An acquired organic mental disorder with loss of intellectual abilities of sufficient severity to interfere with social or occupational functioning. The dysfunction is multifaceted and involves memory, behavior, personality, judgment, attention, spatial relations, language, abstract thought, and other executive functions. The intellectual decline is usually progressive, and initially spares the level of consciousness.Follow-Up Studies: Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.Cohort Studies: Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesized to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics.Risk Factors: An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.United StatesProspective Studies: Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.Memory Disorders: Disturbances in registering an impression, in the retention of an acquired impression, or in the recall of an impression. Memory impairments are associated with DEMENTIA; CRANIOCEREBRAL TRAUMA; ENCEPHALITIS; ALCOHOLISM (see also ALCOHOL AMNESTIC DISORDER); SCHIZOPHRENIA; and other conditions.Glomerular Filtration Rate: The volume of water filtered out of plasma through glomerular capillary walls into Bowman's capsules per unit of time. It is considered to be equivalent to INULIN clearance.Activities of Daily Living: The performance of the basic activities of self care, such as dressing, ambulation, or eating.Brain: The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.Linear Models: Statistical models in which the value of a parameter for a given value of a factor is assumed to be equal to a + bx, where a and b are constants. The models predict a linear regression.
As indicator for population decline[edit]. A research study, published in 2012, on impacts of overfishing and maritime traffic ... Culling marine mammal populations threatens the nutrient supply and the productivity of fishing grounds.[1] ... The hormone levels decline as the animals arrive in the study area, plateau during the time of fish availability and decline ... "Causes of decline among Southern Resident killer whales : Research overview". Center for Conservation Biology. University of ...
... populations have declined dramatically, primarily as a result of overfishing and habitat destruction. In ... Zebra mussels are an invasive species well adapted for explosive population growth as a result of high rates of fecundity and ... Poaching has been a contributing factor to declining populations of American paddlefish in the states where they are ... American paddlefish populations have declined dramatically primarily because of overfishing, habitat destruction, and pollution ...
... but they will become problematic if the population continues to decline.[57] In addition, because porpoise population growth ... In small populations where genetic variability is low, individuals are more genetically similar. When the genomes of mating ... By November 2016, according to a report released in February 2017, the population had declined to about 30, and it was judged ... This represents a 92% decline from the 1997 population level. In March 2016 alone, at least three vaquitas drowned after being ...
Decline in population[edit]. Chinese giant salamanders for sale in a restaurant in Hongqiao Town (虹桥镇) in Zhejiang, China: The ... In recent years populations have also declined with an epizootic Ranavirus infection. The disease causes severe hemorrhaging in ... Despite this, the population continues to decline with the salamanders becoming increasingly difficult to find. In a recent ... But the salamander populations have continued to decline. The domestic demand for salamander meat and body parts greatly ...
Other causes of population decline[edit]. *Normal disease: Wyoming toads have a shorter life span than other toad species, and ... This rate of infection is even seen with in captive breed populations. Survival of the chytrid infection is possible if toads ... Before this sharp decline in population, Wyoming toads were commonly found in the floodplains, ponds, shallow lakes, and ... The chytrid fungus is a major part of the decline of the boreal toad in the Rocky Mountains and is thought to have also played ...
Decline in amphibian populations "Iridoviridae". ICTV Online (10th) Report. Whittington, RJ; Becker, JA; Dennis, MM (2010). " ... "Susceptibility of Italian agile frog populations to an emerging strain of Ranavirus parallels population genetic diversity". ... Ranavirus infections in amphibians have been implicated as a contributing factor in the global decline of amphibian populations ... Ranaviruses have been isolated from wild populations of amphibians in Australia, but have not been associated with mass ...
Populations have therefore suffered considerable decline. Haworthia bayeri - MBB Haworthia Revisited Haworthia truteriorum ... An outlying population of similar plants in the Rooinek Pass, south of Laingsburg, is now usually classed as a separate species ...
Populations are declining. Some sources say that this species is critically endangered. Recently there has been some human ... population studies and evidence of a Batesian-Müllerian situation". Ecological Entomology. 4 (1): 83-93. doi:10.1111/j.1365- ... However, with the decline in these environments, the species is also vanishing from many of these regions. Because of changing ... However, after observing populations in the Czech Republic, it was found that this species was found during quick flying events ...
Dramatic declines in amphibian populations, including population crashes and mass localized extinction, have been noted since ... McCallum, M. L. (2007). "Amphibian decline or extinction? Current declines dwarf background extinction rate". Journal of ... in recent decades there has been a dramatic decline in amphibian populations for many species around the globe. ... Any decline in amphibian numbers will affect the patterns of predation. The loss of carnivorous species near the top of the ...
Population dynamics of subdivided populations tend to vary asynchronously. In an unfragmented landscape a declining population ... Simberloff, Daniel (1 January 1998). "Small and Declining Populations". Conservation Science and Action. Blackwell Publishing ... As the remaining habitat patches are smaller, they tend to support smaller populations of species. Small populations are at an ... limiting a populations capacity to supplement the reduced genetic diversity of the remnant populations. With lower migration, ...
Populations of amphibians, including the Panamanian golden frog, suffered major declines possibly due to the fungal infection ... which caused the El Copé population to rapidly collapse in 2004. Vital habitat is lost each year to small farms, commercialized ... Decline in amphibian populations Ecnomiohyla rabborum Karen Lips; Frank Solís; Roberto Ibáñez; César Jaramillo; Querube ... Although captive populations seem to thrive well, reintroducing them to an area will not stop the threat of chytridiomycosis. ...
Populations went into sharp decline as contact intensified. Imported diseases, to which the islanders had no immunity, ... The Great Andamanese population was large till 1858 when it started declining ... In 1901, their number was reduced to only 600 ... Once the most numerous of the five major groups in the Andaman Islands with an estimated population between 2,000 and 6,600, ... When the British established a permanent settlement and penal colony on Great Andaman in the 1860s, the population was ...
However, some of these populations are in decline. In 1930, G.V. Hudson described the Cook Strait click beetle as "confined to ... It is thought that the lack of decomposing logs on Stephens Island may limit the population size there. Since 1980 A. ... The relict populations on Marlborough Sounds islands are probably due to the introduction of mammalian predators on the ... The presence of five separate populations of the beetle on islands in the Outer Marlborough Sounds probably helps protect it ...
... populations are rapidly declining. The species is listed as Near Threatened on the IUCN Red List. The loss of parts of ... more detailed study confirmed the predicted population structure within jaguar populations in Colombia.[15] ... Baker, Protection and Population Status, p. 4. *^ Soisalo, M. K.; Cavalcanti, S. M. C. (2006). "jaguar "Estimating the density ... It is listed as Near Threatened on the IUCN Red List; and its numbers are declining. Threats include loss and fragmentation of ...
The population is thought to decline continuously. The Arabian leopard is one of the smallest leopard subspecies. It was ... Since local people reduced ungulates to small populations, leopards are forced to alter their diet to smaller prey and ... This captive population comprised fourteen founders that have an unequal number of descendants. Sinai leopard Persian leopard ... The population is severely fragmented. Subpopulations are isolated and not larger than 50 mature individuals. ...
The population is declining dramatically. Current bycatch levels are unsustainable and bycatch reduction measures as well as ... These populations are genetically different. Mortality rates are 1.6% for FMU 4 and 3.3% for FMU 3 but it is unknown whether ... Hunting, until 1996, reduced the population and contributed to its decline. Now hunting has been replaced with eco-tourism. It ... or population decline. Large scale range contractions are considered indicative of impending extinction. A similar form of ...
Its population is in decline. Brust, Mathew Louis; Hoback, William Wyatt; Skinner, Kerri Farnsworth; Knisley, Charles Barry ( ... "Differential Immersion Survival by Populations ofCicindela hirticollis(Coleoptera: Cicindelidae)". Annals of the Entomological ...
"Kerala Census: Child population declines". The Hindu. 2013-05-18. Retrieved 2016-12-01. "Election 2016: Can Kerala learn to ... Latehar and West Singhbhum are concentration areas of tribal populations. Families from Jharkhand worked in several plantations ... The child population growth is currently negative at -8.44%. In less than a decade, the Keralite population is set to decrease ... Kerala has the lowest population growth rate in the country and is set to become the first state with zero population growth, ...
The Galilee is home to a large Arab population, comprising a Muslim majority and two smaller populations, of Druze and Arab ... Ofer Petersburg (December 12, 2007). "Jewish population in Galilee declining". Ynet. Archived from the original on December 9, ... Israel Central Bureau of Statistics (2013). "LOCALITIES(1) AND POPULATION, BY POPULATION GROUP, DISTRICT, SUB-DISTRICT AND ... Israel Central Bureau of Statistics (2013). "SOURCES OF POPULATION GROWTH, BY DISTRICT, POPULATION GROUP AND RELIGION". ...
Ofer Petersburg (December 12, 2007). "Jewish population in Galilee declining". Ynetnews. Retrieved October 15, 2014. חזון מועצה ... There are now substantial Arab populations in several new Galilee towns, including Upper Nazareth (about 20%) and Carmiel (10 ... The Arab population, largely decimated by the war, still formed the majority in the area. Israel's independence meant that the ... An unexpected effect of the government's efforts to attract Jewish population to the Galilee has been the growth of mixed Arab- ...
... found that the population of Dickcissels declined by 40% between the years of 1960 and 1980. The declines were primarily due to ... Many populations of migratory birds are in serious decline. Anthropogenic reasons for this include deforestation and habitat ... If the farmers had been better informed of how small of an impact Dickcissels had on their crops, the population declines of ... Increased predation at stopover sites could lead to drastic declines in migratory bird populations. The study done by Lank and ...
The populations of a third of the land mammal species are thought to be in decline due to factors including environmental ... In 2002 the Scottish grey seal population was estimated at 120,600 adult animals, which is around 36% of the world population ... Hardie, Alison (20 January 2007). "Dramatic decline in island common seal populations baffles experts". Edinburgh: The Scotsman ... and populations are likely to decline if warmer weather brings competitors into their restricted ranges. Mammals and other ...
Their populations are in decline due to habitat destruction. Like all lemurs, they are protected against commercial trade under ... Before this assessment, it was assumed that their population was in decline due to habitat destruction for the creation of ... clustered populations with an overall low population density. As with all lemurs, fork-marked lemurs were first protected in ... Measures of their population density vary widely, from 50 to 550 individuals per square kilometer (250 acres), but these ...
Scientists have now concluded that the decline in duck populations was due to the decline in SAV acreage. Today the population ... Loss of nesting habitat has caused populations to decline. The canvasback usually takes a new mate each year, pairing in late ... Redheads, which also feed on SAV tubers, have not been able to adapt, and their population remains low. Populations have ... By 1985, there were only 50,000 ducks wintering there, or one-tenth of the population. Canvasbacks were extensively hunted ...
Adult populations decline through June and disappear by July. Mating and egg laying occur from the time adults emerge in mid- ... Since annual population surveys began in 1998, the population reached a peak of 2944 in 2002 and a minimum of 558 in 2005. ... In 2012, the population of C. albissima was estimated to be 1786 individuals, up from 1116 in 2011. ... It was previously considered a subspecies of Cicindela limbata, but it is over 370 miles (600 km) from any other populations of ...
There are few official figures available, but the disease has caused a large-scale decline of ash trees across Poland,[19] and ... Bengtsson, S. B. K.; Vasaitis, R.; Kirisits, T.; Solheim, H.; Stenlida, J. (2012). "Population structure of Hymenoscyphus ... A Lithuanian trial based on the planting of trees derived from both Lithuanian and foreign populations of European ash found 10 ... "Ash decline in Nordic and Baltic countries". Metla. 3 July 2007. Retrieved 6 November 2012.. ...
... studies that indicate the overall quality of prey that has been available to Steller sea lions in the declining population ... Metals as chemical tracers to discriminate ecological populations of threatened Franciscana dolphins (Pontoporia blainvillei) ... 1. The decline of Steller sea lions Eumetopias jubatus in the Gulf of Alaska and Aleutian Islands between the late 1970s and ... The decline of Steller sea lions Eumetopias jubatus in Alaska: a review of the nutritional stress hypothesis. Authors. *. A. W ...
In this study, we addressed the molecular population genetics of a global collection of fungal strains from both declining and ... is enigmatic because it occurs globally in both declining and apparently healthy (non-declining) amphibian populations. This ... The widespread occurrence of the same lineage in both healthy and declining populations suggests that the outcome of the ... Rapid Global Expansion of the Fungal Disease Chytridiomycosis into Declining and Healthy Amphibian Populations. ...
But did you know there are also Steller sea lions along the Pacific Coast? These sea lions are facing startling declines. Here ... But did you know there are also Steller sea lions along the Pacific Coast? These sea lions are facing startling declines. Here ... But did you know there are also Steller sea lions along the Pacific Coast? These sea lions are facing startling declines. ... Not all populations of Steller sea lions have been affected equally by the decline. The eastern population (southeast Alaska ...
There has been a rapid decline in the Steller Sea Lion population throughout its historic range. The western population ... Historically Steller Sea Lion populations were threatened by hunting for their meat, fur, and oil. They were killed by bounty ... In 2013, the eastern population segment of Steller Sea Lions was federally delisted but the western population is still ... The population is divided into two distinct segments, the Eastern (East of Cape Suckling, AK) and the Western (West of Cape ...
The population has stabilized in the Gulf of Alaska, but continues to decline in the western and central Aleutian Islands. ... Scientists are currently researching why Steller sea lion populations are declining. Possible reasons for this include an ... In 1993 the North Pacific Universities Marine Mammal Research Consortium, began to study the declining population of Steller ... More than 80% of the Steller sea lion population disappeared from Russian and most Alaskan waters (Gulf of Alaska and Bering ...
Population tendency (growth or declining). S2f. Migration trends. S2g. Settlement patterns. S3. Political stability - Eventual ... Then, White, Cerri and Monte Hermoso are urban populations, while Villa del Mar and Pehuén Co are still rural populations, ... Population density (S2b). Medium degree of population density. Last census shows a density of population by municipality about ... Ratios of dependence (population between 0-14 years old and 65 or more years old with respect to the total population) are 51.8 ...
The decline of the honey bee population in the United States is not something new but has caught the attention of a lot of ... These sea lions are being seen as a threat, but human fishing practices take more than 16% of the fish populations per year. ... The number of salmon consumed by sea lions below the dam has declined in the past two years, but predation rates are still in ... Sea lions are predators and naturally prey on fish, but despite this fact, they eat only 4% of the fish population. In 2010, ...
... is a fungal pathogen and a major contributor to the decline of amphibian populations around the world, threatening many species ... DAPTF - The Declining Amphibian Population Task Force. *PDF document on the transfer of Chytrid Fungus via the hands. ... It is causing a huge amount of extinction and disease within amphibian populations. ...
... declined to a low of 67 in 1971, then rose to about 100 individuals in 1995 (Baird 2001b). By 2001 the population had declined ... and unexplained declines in other populations to the north and west of BC .The closest rookeries to Race Rocks are on the Scott ... decline by up to 20% and still be above the maximum net productivity level for the population.. Harbour seals are known to move ... Demographic consequences include: population. decline, extirpation and extinction.. Marine birds and pinnipeds at Race Rocks ...
... as populations have shifted from rural areas to cities and people have adopted urban lifestyles, and the drop has perhaps ... The European population is declining, and I dont see that you can do much about that. But the real question is: How necessary ... Or better said, it is one part of the best overall strategy one that embraces population decline. For there are those who argue ... "We have to look for new ways to deal with it." According to some, a declining population presents certain opportunities: to ...
... while the populations of 12 have significantly increased. But the nightingale population fell by an alarming 95 percent over ... UK Survey Shows Steep Declines In Woodland Bird Populations. by Sam Savage ... Hewson said the surveys results illustrate that whole suites of migrants are declining, but the species of migrant in decline ... The populations of collared doves in the woodlands increased by 1052 percent, and the stock dove and wood pigeon by 359 percent ...
... are in decline in northern Wisconsin lakes, according to a UC Davis study. ... Feeding a Growing Population Connecting our research and expertise to the effort to feed a growing population under a changing ... Walleye Fish Populations Are in Decline Study a Warning Signal for Popular Game Fish. ... Lakes experiencing declines are often stocked with walleye to make up for a loss in natural production. However, the data show ...
Further examination reveals why the population of some countries are becoming smaller and smaller. ... While many countries have populations that are increasing, whether it be gradual or quick, there are a handful of countries ... Is Japans Population Declining?. In recent years, the alarming rate at which Japans population has been declining has been ... Countries With The Biggest Population Decline. Population is declining in select countries. Further examination reveals why the ...
The temporal stability of the density effect indicated that the negative density-dependence and the population decline are ... the population growth rate tended to decline over time. The negative time effect is probably linked to the host plant (i.e. ... Here, we showed that the overwintering population exhibited a negative density-dependence (i.e. a negative effect on growth ... milkweed) decline in North America. A negative density-dependence was also found in the time series of both egg density per ...
Production, not predation, drives turkey populations. *With high population densities, a significant number of hens wont ... If the habitat conditions decline across multiple counties and states, then birds have no choice but to decline with it. ... It seems that in some areas birds have reached carrying capacity and have declined as the capacity of the habitat to support a ... Why has the overall turkey count dropped 15 percent? These recent declines may not be long-term, but they do warrant close ...
Population Research Institute, Pennsylvania State University, University Park 16802, USA. [email protected] ... Declining fecundity and ovarian ageing in natural fertility populations.. OConnor KA1, Holman DJ, Wood JW. ... Fecundability, on the other hand, does not begin to decline until the early 40s. We hypothesize that this is also a result of ... The results indicate that much of the decline in fecundity can be attributed to an increasing risk of fetal loss with maternal ...
To investigate the long-term biodiversity capacity of agricultural countryside, we quantified bird population trends in Costa ... More bird populations (69) were declining than were stable (39) or increasing (4). Declines were common in resident, ... Long-term declines in bird populations in tropical agricultural countryside. Çağan H. Şekercioğlu, Chase D. Mendenhall, ... Long-term declines in bird populations in tropical agricultural countryside. Çağan H. Şekercioğlu, Chase D. Mendenhall, ...
Are humanoid robots or androids a solution to declining and aging populations? Countries are increasingly turning to advanced ... Population. Robots: A Solution to Declining and Aging Populations?. By Joseph Chamie Reprint , , Print , ... Are humanoid robots or androids a solution to declining and aging populations? Given the prospects of demographic decline and ... Facing declining and aging populations coupled with resistance to immigration, countries are increasingly turning to and ...
The first response to reports of declining amphibian populations was the formation of the Declining Amphibian Population Task ... Symptoms of stressed populationsEdit. Amphibian populations in the beginning stages of decline often exhibit a number of signs ... disease and climate change are thought to be responsible for the drastic decline in populations in recent years.[8] Declines ... Declines in amphibian populations were first widely recognized in the late 1980s[citation needed], when a large gathering of ...
It was clearly not intended to be the solution to remedying the current decline in the bee population. It is fascinating ... Honey bee populations around the world are in decline due to causes ranging from "super mites" to Colony Collapse Disorder (CCD ... Honey bee populations around the world are in decline due to causes ranging from "super mites" to Colony Collapse Disorder (CCD ... 17 thoughts on "Scientists develop flying "robo-bees" to pollinate flowers as bee populations decline" * ...
... but is also responsible for long-term population declines. We need to understand more about this virus if we are to minimise ... Emerging Frog Virus Responsible for 80 Percent Decline in UK Populations. David DeFranza (@ddefranza). Science / Natural ... Ranavirus was responsible for an 81 percent decline in adult frog populations over the last 12 years. ...
The muskox population has declined sharply on the N.W.T.s Banks Island and the Nunavut side of Victoria Island in past years, ... Muskoxen populations have been in sharp decline in both areas affected by the bacteria. The Banks Island muskox population has ... Unusual bacteria could be key to Northern muskox populations decline. The muskox population has declined sharply on the N.W.T ... Researchers figure bacteria, climate change among main factors causing decline in N.W.T., Nunavut population. CBC News · Posted ...
Asian hornets in Europe and the polyphagous shot hole borer in South Africa tend to show rapid population rises as they invade ... As Insect Populations Decline, Scientists Are Trying to Understand Why. The real story behind reports of an "insect Armageddon ... "We do know we have some declines, some very worrisome declines," echoes David Wagner, professor of ecology and evolutionary ... "The vast majority of studies that have come out in the last decade are showing a decline in populations or insect species or ...
A study by the World Wildlife Fund and the Zoological Society of London projects that by 2020 vertebrate species populations ... The rate of decline shows no sign of slowing. Between 1970 and 2012, a span of 42 years, the overall vertebrate population ... Vertebrate species populations in dramatic decline. By Philip Guelpa 1 November 2016 An alarming new study, the Living Planet ... Vertebrate populations are clearly under tremendous stress, as indicated by the substantial decreases in population sizes. The ...
The observed population declines were not uniform across the sexes (table 2) such that, with the exception of Z. longissimus ( ... Are snake populations in widespread decline?. C. J. Reading, L. M. Luiselli, G. C. Akani, X. Bonnet, G. Amori, J. M. Ballouard ... Are snake populations in widespread decline?. C. J. Reading, L. M. Luiselli, G. C. Akani, X. Bonnet, G. Amori, J. M. Ballouard ... also exhibited large and surprisingly similar patterns of decline. Most of the declining populations exhibited a tipping point ...
  • The eastern population (southeast Alaska and down the west coast to California) have rebounded and were removed from the Endangered Species Ac t threatened listing in 2013. (nature.org)
  • The western population (from just east of Prince William Sound and to the Aleutian Islands) threatened listing was elevated to "Endgangered" in 1997 because of continued decline. (nature.org)
  • That's concerning because, even though juveniles in various colonies have been recorded staying with their mother and suckling for up to three years, in areas where the population is doing well, most pups wean by the end of their first winter. (nature.org)
  • The first assumes non-stationarity and tries to investigate whether carrying capacity is declining due to environmental changes (e.g. host plant, pesticides, climate change) or to find other demographic factors than can bring the population close to extinction. (nature.com)
  • The genetic study shows that there is a high risk of extinction of the orangutan in Sabah in the near future if this decline goes on unabated," says Marc Ancrenaz, who also participated in the study. (innovations-report.com)
  • We observed strong evidence that Barred Owls negatively affected Spotted Owl populations, primarily by decreasing apparent survival and increasing local territory extinction rates. (abcbirds.org)
  • The United Nations projects that the world's population will reach 9.7 billion by 2050 before peaking at 11.2 billion by 2100. (worldatlas.com)
  • As many people are stunned by these figures, the truth is that the world's population growth is not evenly distributed. (worldatlas.com)
  • As quality of life in Andorra is excellent - the country's life expectancy is one of the world's longest - the major factor behind its population shrinkage is actually a low birth rate. (worldatlas.com)
  • In addition to this birth rate, which is among the world's lowest, Andorra is difficult to immigrate too, which leaves the population with little ways to grow outside of birth rate. (worldatlas.com)
  • The Eurasian country of Georgia has the world's fourth largest population decline, with the country having lost -1.21% of its population between 2010 and 2015. (worldatlas.com)
  • No reference is made to the fact that decisions regarding industrial growth, resource exploitation, the development of more efficient technologies, and a whole range of other economic issues that affect the environment are made by the financial and corporate elites, a tiny minority of the world's population, to protect their own interests. (wsws.org)
  • In the largest study on the genetics of whale sharks conducted to date, researchers found that the world's biggest fish likely exist in 2 distinct populations with minimal connectivity between the Indo-Pacific and the Atlantic Ocean. (brightsurf.com)
  • A combination of a low birth rate and a high migration rate are to blame for the population decrease in Georgia. (worldatlas.com)
  • In livestock populations, fitness may decrease due to inbreeding depression or as a negatively correlated response to artificial selection. (nih.gov)
  • In the absence of a correlated response due to artificial selection, the critical population size at which the increase due to natural selection and the decrease due to inbreeding depression balance each other is approximately D/2σwa (2), where D=the inbreeding depression of fitness with complete inbreeding, and σwa (2)=the additive genetic variance of fitness. (nih.gov)
  • The study predicts that this population decrease will hit some countries harder than others, with Spain, Portugal, and Thailand expected to have their populations drop by more than half by the end of the century. (unknowncountry.com)
  • Although a decrease in the world population would appear to be a good thing in regards to the planet's overburdened resources, this trend has sociological consequences, with fewer young people coming into the world to provide for older generations. (unknowncountry.com)
  • If that age-specific mortality pattern continues, it will not only decrease the overall population, but also increase the amount of those dependent on the social system, as there will be fewer people working, Cromartie says. (kmuw.org)
  • Continued efforts are needed to decrease the prevalence of NLEA risk factors and to improve foot care among certain subgroups within the U.S. diabetic population that are at higher risk. (diabetesjournals.org)
  • The trend towards a decrease in adult height and a general reduction of overall health during times of subsistence change remains valid, with the majority of studies finding stature to decline as the reliance on agriculture increased. (blogspot.com)
  • The impact of agriculture, accompanied by increasing population density and a rise in infectious disease, was observed to decrease stature in populations from across the entire globe and regardless of the temporal period during which agriculture was adopted, including Europe, Africa, the Middle East, Asia, South America, and North America. (blogspot.com)
  • A new study published in the open-access journal PLoS Biology shows strong genetic evidence of a catastrophic collapse in orangutan populations living in the fragmented forests of the Kinabatangan Wildlife Sanctuary in Sabah, Malaysia. (innovations-report.com)
  • That's the reason that Manu Saunders, a research fellow in ecosystem services, believes that the claims of catastrophic decline made by Dr Sanchez-Bayo are overstated. (abc.net.au)
  • The study does not pinpoint the exact causes for the decline, though it suggests it is likely a combination of factors, including climate change , habitat degradation and harvest rates that might at times outpace production levels if not monitored closely. (ucdavis.edu)
  • Kutz suggests that climate warming, more predators and melting sea ice could be other factors in the muskoxen population decline, though more research needs to be done. (cbc.ca)
  • This dramatic decline is mainly attributed to a combination of climate change, environmental pollution, the human-facilitated spread of diseases, over-exploitation, and habitat destruction. (wsws.org)
  • Although the causes of these declines are currently unknown, we suspect that they are multi-faceted (such as habitat quality deterioration, prey availability), and with a common cause, e.g. global climate change, at their root. (royalsocietypublishing.org)
  • If you live in the tropics it's most likely to be deforestation and climate change [that are responsible for declining insect populations], but in Europe - where deforestation is no longer a problem - it's use of chemical fertilisers and pesticides, and the reduction of other elements that used to be present in the agricultural landscape, such as hedge rows, trees, flowers, weeds. (abc.net.au)
  • The rate at which our climate is warming was found to be the best explanation for the observed rate of population declines . (phys.org)
  • Birds were one of the worst affected by rapid climate warming, with effects being twice as strong in birds over mammals, as well as populations located outside of protected areas being more severely impacted. (phys.org)
  • Senior co-author, Dr Robin Freeman head of the Indicators and Assessment Unit at ZSL's Institute of Zoology said: "Our research shows that in areas where the rate of climate warming is worse, we see more rapid bird and mammal population declines. (phys.org)
  • Importantly, our finding does not suggest that human land-use changes, such as for agriculture, development or deforestation do not play a role in the decline of birds and mammals, or that because the decline is climate change related, it's somehow something for future generations to deal with. (phys.org)
  • The Audubon Society and other conservationist groups have recently been getting publicity for the idea that bird populations in the United States are declining and that the cause of the decline is Climate Change or Global Warming. (wattsupwiththat.com)
  • Some seabird populations are recovering from prior declines, though threats remain from fishing operations, offshore energy development, and climate change. (wattsupwiththat.com)
  • It's a trend which David Egan-Robertson, an applied demographer at the University of Wisconsin's Applied Population Laboratory, can be traced back to the Great Recession between 2007 and 2009. (badgerherald.com)
  • Continuing longtime trends, rural areas are still seeing declining populations, the rebound from the Great Recession is slow and poverty remains a persistent problem, according to the USDA's " Rural America at a Glance ," released Thursday. (kmuw.org)
  • In attempting to explain the forces driving these dramatic animal population declines, the Living Planet Report refers only to empirical trends such as human population growth, increases in carbon dioxide emissions and fertilizer consumption and the like, and offers only vague remedies such as the adoption of an "Earth system perspective. (wsws.org)
  • Feathers from museum specimens of rockhopper penguins are helping to throw light on the dramatic population decline of this bird in New Zealand's sub-Antarctic islands since the 1940s. (niwa.co.nz)
  • Due to low fertility rates and increased longevity, population age structures are becoming older than ever before. (ipsnews.net)
  • Although some regions are still experiencing population growth, the overall downward trend is being fueled by the increased availability of education for women around the world, allowing them to enter the workforce, along with the improved accessibility of contraception and declining fertility rates, making for fewer deliveries by the stork every year. (unknowncountry.com)
  • These recent declines may not be long-term, but they do warrant close monitoring. (nwtf.org)
  • Recent (2007) research indicates the reemergence of varieties of chrytid fungi may account for a substantial fraction of the overall decline. (wikipedia.org)
  • This is the first time that a recent and alarming decline of a great ape population-brought about by man-has been demonstrated, dated, and quantified using genetic information," says Goossens, a wildlife geneticist at Cardiff University who conducted the genetic study. (innovations-report.com)
  • The case studies feature four remote territories with the following common characteristics: they have undergone significant socio-economic transformations over the past decade, they face a population decline with an alarming outmigration of youth combined with an increasing ageing population, and central governments have channelled recent immigration and asylum seekers to peripheral areas to counterbalance negative demographic trends. (oecd-ilibrary.org)
  • We review recent research on the pathology, ecology, and biogeography of two emerging infectious wildlife diseases, chytridiomycosis and ranaviral disease, in the context of host-parasite population biology. (cdc.gov)
  • Recent advances in theoretical and experimental host-parasite ecology have demonstrated a major role for infectious agents in the population biology of wild animals ( 10 , 11 ). (cdc.gov)
  • (20) . These data, along with recent findings of amphibian mass deaths in these areas, suggest that such local extinctions are not normal population fluctuations or metapopulation dynamics. (cdc.gov)
  • According to a recent study, reports of Evening Grosbeaks at FeederWatch sites declined by fifty percent between 1988 and 2006. (feederwatch.org)
  • Although results of several recent studies ( 6 - 9 ) have shown encouraging trends in rates of NLEA in various populations and evidence of subgroup disparities among people with diabetes, no comprehensive studies have examined trends in NLEA rates or characteristics associated with diabetes-related NLEAs in the overall U.S. population. (diabetesjournals.org)
  • Eventually, the team hopes to not only conclusively identify the cause of the decline, but come up with a solution. (cbc.ca)
  • The rate of decline shows no sign of slowing. (wsws.org)
  • But the rate of animal population drop-off is 100 to 1,000 times the rate of decline before human activity was a factor, the report found, accelerating the disappearance of not just life but the ecosystems it inhabits. (washingtonpost.com)
  • (Washington, DC, December 10, 2015) The Northern Spotted Owl is in decline across its entire range, and its rate of decline is increasing-that is the conclusion of a major demographic study produced by federal scientists, published Wednesday, December 9, 2015, in the journal "The Condor. (abcbirds.org)
  • That growth rate dipped to 73.9 million in 2003, saw a somewhat smaller peak of 84.8 million in 2013, but has been on the decline since then, with 81.3 million people being born in 2019. (unknowncountry.com)
  • Northern's numbers mirror declining prison populations across the state, but the maximum-security correctional institution stands out because its average daily population count is the lowest of Connecticut's 15 prisons so far in 2019. (ctmirror.org)
  • In Paleopathology at the Origins of Agriculture (Cohen and Armelagos, 1984), this trend towards declining health was observed for 19 of 21 societies undergoing the agricultural transformation. (blogspot.com)
  • the second suggested that the raising of the Loskop Dam resulted in flooding of basking and nesting areas making these unusable by crocodiles and thus reducing recruitment into the population (Jacobsen, 1984). (scielo.org.za)
  • Jacobsen (1984) warned that should the decline in crocodile numbers in the Loskop Dam be a result of pollution, then recovery was unlikely and re-introduction of crocodiles into the system would be pointless. (scielo.org.za)
  • Of particular concern are population declines in ecologically pristine areas, such as the montane tropical rain forests of Australia and Central America, where human impact from agriculture, deforestation, or pollution is thought to be negligible. (cdc.gov)
  • The negative population growth is mainly due to a very low birth rate (there are around 8 births per 1,000 Japanese women) and an even lower rate of immigration to the country. (worldatlas.com)
  • Facing declining and aging populations coupled with resistance to immigration, countries are increasingly turning to and investing in advanced robotic technology to meet their labor needs and also increase productivity, reduce labor costs and improve goods and services. (ipsnews.net)
  • A reduction over time in a region's population can be caused by several factors including sub-replacement fertility (along with limited immigration), heavy emigration, disease, famine, and war. (wikipedia.org)
  • Some of these have been applied in Russia, Armenia, and many Western European nations which have used immigration and other policies to suspend or slow population decline. (wikipedia.org)
  • Many nations in Western Europe (and the EU as a whole) would today have declining populations if it were not for immigration. (wikipedia.org)
  • The "best of times" story is that Canada's urban centres are strengthening in population, boosted in no small part by significant immigration numbers in major cities like Toronto and Vancouver. (dal.ca)
  • New approaches will be needed to both cope with and compensate for this disparity, including more open immigration policies-a measure already being taken by some countries that are experiencing a decline in natural population growth . (unknowncountry.com)
  • A relic from an era of high crime, long sentences and harsh punishment, Northern has housed inmates since 1995, when the state's prison population was much greater and officials were having a hard time managing behavioral infractions occurring throughout the prison system. (ctmirror.org)
  • Data submitted by participants over the eighteen-year period indicate that reports of Evening Grosbeaks at FeederWatch sites have declined by fifty percent. (feederwatch.org)
  • We found that adult survival rates for both populations were as high as those observed for most other protected brown bear populations. (plos.org)
  • Adult breeding sex ratio was male-biased in the Western population and female-biased in the Central population. (plos.org)
  • Our results exclude high anthropogenic mortality as a cause for population decline in the West but support low reproductive success, which could result from sexually selected infanticide induced by a male-biased adult sex ratio or inbreeding depression. (plos.org)
  • On the other, neonicotinoids used to control other insect pests are also being applied in agriculture fields and, as the report indicates, "negatively affect larval monarch populations. (inhabitat.com)
  • While some declines are clearly due to habitat destruction, others are not associated with obvious environmental factors. (cdc.gov)
  • But the nightingale population fell by an alarming 95 percent over the study period. (redorbit.com)
  • Bass like warmer waters, and unlike walleye, their populations have increased over the study period. (ucdavis.edu)
  • We undertook an 11 month prospective endocrinological study in a natural fertility (non-contracepting) population (rural Bangladesh) to estimate the contributions of fetal loss and fecundability (the probability of conception) to declining fecundity with age. (nih.gov)
  • And they provide sustenance for a spectrum of other animals-in fact, the Puerto Rico study showed a decline in density of insect-eating frogs, birds and lizards that paralleled the insect nosedive. (scientificamerican.com)
  • In particular, the study zeroed in on the Mummy herd, which experienced a severe population crash in the mid-1990s and has been especially slow to recover. (innovations-report.com)
  • He'll be spending much of the next year at the Woodrow Wilson International Center for Scholars in Washington, D.C., working on a comparative study of population trends between Canada and the United States. (dal.ca)
  • A new study published in The Lancet is forecasting a "jaw-dropping" decline in the planet's population by 2100, with the number of people in 23 countries expected to drop by half by the end of the century. (unknowncountry.com)
  • most of the world is transitioning into natural population decline," explains study co-author Christopher Murray, at the University of Washington. (unknowncountry.com)
  • In fact, the study projects that Nigeria will become the second most populous country on the planet by 2100, with a population of 791 million. (unknowncountry.com)
  • In this study, we used data from two nationally representative surveys to assess trends in NLEA hospital discharge rates by patients' diabetes status and to determine whether disparities in NLEA rates within the diabetic population persist. (diabetesjournals.org)
  • Subjects with mild COPD and those from a high-risk COPD population were recruited from a community-based COPD epidemiological study after obtaining consent. (dovepress.com)
  • The vast majority have minorities increasing, in many cases either slowing or reversing overall population decline," says Kelly Pohl, researcher and co-author of the study. (fortmorgantimes.com)
  • The apparent decline in the number of Nile crocodiles present in the Loskop Dam prompted a study to determine the number, size and distribution of Nile crocodiles now present in the reservoir. (scielo.org.za)
  • I would say the insect decline in biomass and diversity is real because we see things repeated across different sites across different groups," says Weller. (scientificamerican.com)