Concerning diversification processesSpeciationAlternative hypothesesRapid diversificationPhylogenyMorphological evolutionEvolutionaryLineageDivergenceShiftsLineagesEcologicalCoevolutionaryRadiationTropicsPutativeOrganismalMolecularFlowering plantsGenusEvolutionTraitsDynamicsPlioceneAdaptiveIncreasesTestMyrtaceaeRatesMajorSupportPatternsFamilyOrigin
Concerning diversification processes1
- My research on the California tarweeds and the Hawaiian silversword alliance (Compositae: Madiinae) has involved testing of hypotheses concerning diversification processes and rates, chromosomal and morphological evolution, ecological shifts, dispersal events, and the evolutionary importance of hybridization. (berkeley.edu)
Speciation3
- Here we build on these observations and hypothesize that selection in mixed-species animal societies, such as mixed-species bird flocks, may drive diversification, potentially leading to speciation. (nsf.gov)
- However, the hypothesis of host-driven speciation is seldom tested formally and must be weighed against overlooked explanations involving geographic isolation and non-ecological reproductive barriers in the process of speciation. (hal.science)
- Many hypotheses advanced by previous investigators proved to be correct, but some of the defining characteristics of orchids -- their tiny seeds, their requirement for fungi to germinate, and their fused pistils and anthers -- were not themselves responsible for the high rate of orchid speciation. (eurekalert.org)
Alternative hypotheses2
- We propose a series of steps that can be used to tease apart alternative hypotheses to build our understanding of the potential role of convergence in diversification in participants of mixed-species societies. (nsf.gov)
- Evaluating alternative hypotheses for the early evolution and diversification of ants. (antcat.org)
Rapid diversification1
- Reconstruction of phylogenetic relationships in diploids supported recent and rapid diversification accompanied by reticulation events. (trapa.cz)
Phylogeny3
- Pandanales, the pandans or screw-pines, is an order of flowering plants placed in the monocot clade in the Angiosperm Phylogeny Group and Angiosperm Phylogeny Web systems. (wikipedia.org)
- I propose to test these hypotheses by combining and analyzing existing databases that contain information on phylogeny, ploidy level, functional traits, and climate niches of angiosperms. (duke.edu)
- Phylogeny of the ants: diversification in the age of angiosperms. (antcat.org)
Morphological evolution2
- Morphological character mapping results suggest that the high Andean forest tree species are derived from shrubby páramo-puna ancestors, contradicting previous hypotheses about morphological evolution of the genus and documenting an atypical trend of downslope diversification in páramo plants. (bioone.org)
- The underlying hypothesis of my approaches has been that the polymorphism of regulatory factors is of primary importance for morphological evolution. (universite-paris-saclay.fr)
Evolutionary7
- We conducted maximum likelihood (ML), maximum parsimony (MP) and Bayesian (B) analyses on partial RNA polymerase largest (RPB1) and second largest subunit (RPB2) nucleotide sequences of 93 fusaria to infer the first comprehensive and well-supported phylogenetic hypothesis of evolutionary relationships within the genus and 20 of its near relatives. (usda.gov)
- However, empirical studies that focus on the potential for interaction between animal pollination and hybridization to affect and contribute to evolutionary diversification are rare. (nature.com)
- Whole genome duplication, or polyploidy, has occurred throughout the evolutionary history of angiosperms, with elevated chromosome numbers observed in at least 70% of all species. (duke.edu)
- This observation is consistent with the stress-dominance hypothesis if we assume ecological niches to be conserved within evolutionary niches. (scielo.br)
- Evolutionary history of aphid-plant associations and their role in aphid diversification. (hal.science)
- We are interested in testing competing hypotheses on the nature of organismal evolution using marine tetrapods as parallel natural evolutionary experiments from which to derive general nomothetic principles. (macrofun.es)
- Recently, more attention is focused on the role of ancient hybridization that has repeatedly been shown as triggers of evolutionary radiation, although in some cases, it can prevent further diversification. (trapa.cz)
Lineage3
- We found significant increases of diversification rates in the "Mediterranean lineage" associated with the Messinian Salinity Crisis, onset of Mediterranean climate, Plio-Pleistocene sea-level fluctuations, and apomixis. (uni-frankfurt.de)
- Positive shifts in diversification rate have occurred separately in each lineage, associated with a shift from dry to fleshy fruit. (edu.au)
- Ancient hybridization in Curcuma (Zingiberaceae)-Accelerator or brake in lineage diversifications? (trapa.cz)
Divergence3
- A phylogenetic hypothesis and estimate divergence times for Myrtaceae is developed as a basis to explore the evidence for, and drivers of, elevated diversification rates among the fleshy-fruited tribes of Myrtaceae. (edu.au)
- However, understanding whether this is phenotypic matching driven by convergence, and whether this divergence has promoted biodiversity, requires testing multiple facets of this hypothesis. (nsf.gov)
- Even if our social convergence/divergence hypothesis is not supported, the testing at each step should help highlight alternative processes that may affect mixed-species flocks, trait evolution and possible convergence. (nsf.gov)
Shifts5
- At the global scale, we test whether the identified shifts in diversification rates are linked to specific geological and/or climatic events in the Mediterranean area and/or asexual reproduction (apomixis). (uni-frankfurt.de)
- Previous studies suggest that fleshy fruits have evolved separately in these lineages, whereas generally shifts in fruit morphology have been variously implicated in diversification rate shifts among angiosperms. (edu.au)
- Focusing on the fleshy-fruited tribes, a variety of statistical approaches were used to assess diversification rates and diversification rate shifts across the family. (edu.au)
- Conclusions Fleshy fruits have evolved independently in Syzygieae and Myrteae, and this is accompanied by exceptional diversification rate shifts in both instances, suggesting that the evolution of fleshy fruits is a key innovation for rainforest Myrtaceae. (edu.au)
- Noting the scale dependency of this hypothesis, more complex explanations may be required to explain diversification rate shifts occurring within the fleshy-fruited tribes, and the suggested phylogenetic hypothesis provides an appropriate framework for this undertaking. (edu.au)
Lineages5
- WebThus, it is suggested here that the multitude of resources available on the terminal branches of the newly evolved angiosperm, rain forest trees led to the morphological adaptations of 35 - Based on genetic analysis of living primates calibrated by the fossil record, it is estimated that apes and Old World monkeys diverged into separate lineages around: 36 - Which fossil group is characterized by an eye orbit fully enclosed by bone? (founderops.com)
- It is found that Syzygieae and Myrteae have experienced elevated diversification rates relative to other lineages of Myrtaceae. (edu.au)
- Here we retrieved 26,092 putative complete LTR-RTs from 10 lineages found in 10 fully sequenced angiosperm genomes and found putative vl-att sites that are a conserved structural landmark across these genomes. (biomedcentral.com)
- Moreover, this is the first identification of specific LTR-RT content and their amplification patterns in a large dataset of LTR-RT lineages and angiosperm genomes. (biomedcentral.com)
- The present study supports the existence of structural vl-att sites in nine out of 10 LTR-RT lineages of 10 angiosperm genomes. (biomedcentral.com)
Ecological1
- Taken together, these preliminary results expand our understanding of K-Pg mammals and our basis for testing ecological hypotheses of the K-Pg mass extinction and recovery. (palaeo-electronica.org)
Coevolutionary1
- Ficus (figs) and their agaonid wasp pollinators present an ecologically important mutualism that also provides a rich comparative system for studying functional co-diversification throughout its coevolutionary history (~75 million years). (nature.com)
Radiation4
- The angiosperm radiation hypothesis proposes that: - Q/A (Question and Answer) Sara Graham Test Answer Answer: certain primate traits were responses to the acquisition of fruit during the Cenozoic. (founderops.com)
- Carpolestes 6.8.2: Major Hypotheses About Primate Origins Social Sci LibreTexts, 8.who developed the visual predation hypothesis, 9.Anthro Chap 9 Flashcards.pdf 1 The arboreal hypothesis, the angiosperm radiation hypothesis proposes that, 10+ super 8 by wyndham fort mitchell cincinnati area most standard, 9+ immortal way of life game most standard, 9+ bed bath and beyond makeup organizer most standard. (founderops.com)
- Primarily Andean, the genus seems to have undergone an adaptive radiation indicated by its high number of species, broad morphological variation, and diversification primarily in an ecosystem (páramo) that formed within the last 2-5 my. (bioone.org)
- Phylogenetic studies conducted at different taxonomic levels show that, as in many phytophagous insect groups, the radiation of angiosperms has probably favoured the major Tertiary diversification of aphids. (hal.science)
Tropics3
- Only later, when the orchids acquired pollinia, started to grow in trees, and then colonized the cloud forests along extensive mountain ranges in the tropics, did the orchids' unrivalled diversification begin. (eurekalert.org)
- Give three hypotheses for explaining why tropics show greatest levels of species richness. (saralstudy.com)
- There are three different hypotheses proposed by scientists for explaining species richness in the tropics. (saralstudy.com)
Putative1
- Then, based on the numbers of species known in each of these groups today, the researchers were able to calculate the rate of species diversification in each and test the many putative causes of the explosion in orchid species. (eurekalert.org)
Organismal1
- The 'adaptationist program', by contrast, is an often pejorative term for the combination of the tendency to explain all organismal features as adaptations, protecting adaptive hypotheses from rejection with ad-hoc explanations, reluctance to entertain non-adaptive hypotheses and the willingness to accept any plausible sounding adaptive story [2]. (coek.info)
Molecular1
- Our results reveal that similarities between the cuticular biochemical signatures of major plant groups (extant and fossil) are mostly consistent with recent phylogenetic hypotheses based on molecular and morphological data. (nature.com)
Flowering plants1
- Major modern groups of flower-pollinating insects radiated synchronously to angiosperms (flowering plants) in the mid-Cretaceous as a result of one the most formative episodes of coevolution in the history of life. (macrofun.es)
Genus1
- Here, we investigate the impact of both species-intrinsic and -extrinsic factors on diversification in the species-rich, cosmopolitan Limonium, an angiosperm genus with center of diversity in the Mediterranean. (uni-frankfurt.de)
Evolution5
- Which of the following hypotheses is/are related to the evolution of unique primate traits? (founderops.com)
- This work will provide insight into whether there are general consequences of genome duplication, and help determine whether polyploidy influences the niche evolution and diversification of angiosperms. (duke.edu)
- 2011. Phylogenetic perspectives on diversification, biogeography, and floral evolution of Collinsia and Tonella (Plantaginaceae). (berkeley.edu)
- The fossil record is therefore crucial to inform on early vertebrate evolution by revealing the timing and tempo of character acquisition and testing hypotheses on the driving factors. (macrofun.es)
- Hybridization is a widespread phenomenon in the evolution of plants and exploring its role is crucial to understanding diversification processes of many taxonomic groups. (trapa.cz)
Traits1
- I chose these traits because they have evolved several times independently during angiosperm diversification, most probably as a result of convergent selective pressures for pollination efficiency. (universite-paris-saclay.fr)
Dynamics1
- We then estimate ancestral ranges and diversification dynamics at both global and regional scales. (uni-frankfurt.de)
Pliocene1
- Our results support a late Paleogene origin in the proto-Mediterranean area for Limonium, followed by extensive in situ diversification in the Mediterranean region during the late Miocene, Pliocene, and Pleistocene. (uni-frankfurt.de)
Adaptive1
- finding that empty space morphologies can be readily produced in development helps reject constraint and lends support to adaptive hypotheses. (coek.info)
Increases1
- The stress-dominance hypothesis postulates that the importance of competition in plant communities declines with increasing environmental stress while the importance of environmental filters increases. (scielo.br)
Test2
- At the regional scale, we infer the biogeographic origins of insular endemics in the oceanic archipelagos of Macaronesia, and test whether woodiness in the Canarian Nobiles clade is a derived trait linked to insular life and a biotic driver of diversification. (uni-frankfurt.de)
- To test this hypothesis for campo rupestre vegetation, we analyzed phylogenetic diversity and community structure of angiosperm communities at two study sites within the Itacolomi State Park, Minas Gerais, Brazil. (scielo.br)
Myrtaceae2
- Background and Aims The angiosperm family Myrtaceae comprises 17 tribes with more than half of the estimated 5500 species being referred to the fleshy-fruited and predominantly rainforest associated Syzygieae and Myrteae. (edu.au)
- Key Results Analyses of the sequence data provide a strongly supported phylogenetic hypothesis for Myrtaceae. (edu.au)
Rates1
- We find that Limonium species diversity on the Canary Islands and Cape Verde archipelagos is the product of multiple colonization events followed by in situ diversification, and that woodiness of the Canarian endemics is indeed a derived trait but is not associated with a significant shift to higher diversification rates. (uni-frankfurt.de)
Major2
- Geo-climatic changes and apomixis as major drivers of diversification in the Mediterranean sea lavenders (Limonium Mill. (uni-frankfurt.de)
- This is based on Anacardiaceae being pantropical in distribution with North and South America representing major diversification centers of the family including the geographical distribution of Pistacia. (scialert.net)
Support1
- Our novel chemotaxonomic data also support the hypothesis that the extinct Nilssoniales and Bennettitales are closely allied, but only distantly related to Cycadales. (nature.com)
Patterns1
- Our mutation rate estimates will be vitally important to testing hypotheses concerning the origin and migration patterns of modern humans. (ukri.org)
Family1
- Looking at the orchids as a family, Givnish finds "not one spark for their extraordinary diversification, but many. (eurekalert.org)
Origin2
- Diversification time estimates date the origin of the TFC to the middle Cretaceous 91.3 million years ago (Mya) (95% highest posterior density [HPD] interval: 44.7, 149.3). (usda.gov)
- 2010. Hawaiian angiosperm radiations of North American origin. (berkeley.edu)