• This work is based on examinations of several hundred larvae of each species, with numerous observations of larvae in the act of moulting and pupating which confirmed the morphological indications of three larval instars. (cambridge.org)
  • Planktotrophic larvae of all four species fed on cultured phytoplankton ( Chaetoceros gracilis ) attained metamorphic competence within 22-24 days after fertilization. (hindawi.com)
  • Juveniles from larvae of all four species that metamorphosed soon after becoming competent tended to have higher growth rates (test diameter and length of spines) than juveniles from larvae that metamorphosed after a prolonged period of competence with progressively slower growth the longer the prolonged period. (hindawi.com)
  • Despite the adverse effects of delaying metamorphosis on growth parameters, competent larvae of all four species were able to survive up to 5 months and after metamorphosis grew into 1-month-old juveniles in lab condition. (hindawi.com)
  • Speciose marine taxa like echinoderms, molluscs, and polychaete annelids have many species with larvae that retain their competent stage for weeks or months in drifting currents [ 15 , 33 , 34 ] and travel over long distances [ 35 - 37 ]. (hindawi.com)
  • Results of this analysis demonstrate these two environmental vibrios, previously characterized as variant V. cholerae strains, are new species which have evolved from ancestral lineages of the V. cholerae and V. mimicus clade. (beds.ac.uk)
  • Results of this study suggest these two strains represent novel species and demonstrate evidence of horizontal gene transfer with their near-neighbors, V. cholerae and V. mimicus . (beds.ac.uk)
  • Identification of Mycobacterium avium complex strains and some similar species by high-performance liquid chromatography. (microbiologyresearch.org)
  • By studying a special group of closely-related fish species inhabiting the Great Lakes of Africa, researchers have uncovered clues to understanding how the components of color vision can undergo change over a relatively short period of evolutionary time. (innovations-report.com)
  • In spite of their relevance, there is a lack of evolutionary and genetic studies not only on these species, but on other species of the fraterculus group as well. (g3journal.org)
  • Rarely-introduced species tended to fare better in the presence of congeners, but it appears that this effect was generated because species introduced accidentally into highly invasible agricultural and ruderal habitats have many relatives in the region, due to common evolutionary origins. (nerc.ac.uk)
  • This species specificity is achieved by a differing importance of cuticular hydrocarbons (CHCs) and iridoids in the female mate recognition pheromones. (uni-regensburg.de)
  • Our results provide novel insights into pheromone evolution in insects by showing that selection on two completely different classes of chemical compounds may generate conditions where compounds from both classes contribute to a varying degree to the chemical communication of closely related species and that this variation also generates the species specificity of the signals. (uni-regensburg.de)
  • 0.5), and functional enrichment analysis revealed that significant proportions of the orthologs were in the categories DNA repair, stress resistance, which may provide some hints as to how the two closely related Primula species adapted differentially to extreme environments, such as habitats characterized by aridity, high altitude and high levels of ionizing radiation. (biomedcentral.com)
  • In recent years genome sequencing has been used to characterize new bacterial species, a method of analysis available as a result of improved methodology and reduced cost. (beds.ac.uk)
  • Nucleotide polymorphism at 12 nuclear loci and two mitochondrial gene fragments was studied in three closely related pine species from the Pinus mugo complex in populations across the species distributional range in Europe. (nerc.ac.uk)
  • For DArT array probe development population samples of 16 species of Pinus , 24 provenances of Pinus taeda L. and two mapping populations were used as starting material organized in pooled samples. (biomedcentral.com)
  • A total of 856 and 930 markers were found polymorphic across samples of 24 individuals of each one of two mapping populations, while 1,776 DArT markers were polymorphic in a panel of 16 species, two individuals per species and 16 Pinus taeda US provenances, one individual per provenance. (biomedcentral.com)
  • We obtained 55,284 and 55,011 contigs with N50 values of 938 and 1,085 for P. poissonii and P. wilsonii , respectively, and 6,654 pairs of putative orthologs were identified between the two species. (biomedcentral.com)
  • The presence of conserved integration loci for genomic islands as well as evidence of horizontal gene transfer between these two new species, V. cholerae , and V. mimicus suggests genomic islands and virulence factors are transferred between these species. (beds.ac.uk)
  • The members of this group are virtually indistinguishable by 16S rRNA sequence analysis, with as much variability present among the multiple rDNA operons of an individual species as among different isolates ( 4 ). (asm.org)
  • Cichlid fish of the East African Rift Lakes are renowned for their diversity: Owing to migrations of ancestor species out of Lake Tanganyika and into other lakes, such as Lake Malawi, it has been estimated that hundreds of new cichlid species have arisen in these lakes in the last 100,000 years. (innovations-report.com)
  • Tissues resolved into separate clusters in non-metric multidimensional scaling ordination analysis and samples from the two species generally clustered by tissue rather than by species. (diva-portal.org)
  • Multilocus enzyme electrophoresis and comparative DNA sequence analysis suggest that they may represent a single species ( 15 ). (asm.org)
  • Nuclear ribosomal DNA monophyly versus mitochondrial DNA polyphyly in two closely related mite species: the influence of life history and molecular drive. (semanticscholar.org)
  • Through the analysis of cytoplasmic incompatibility and similar mitochondrial DNA, it has been shown that D. simulans and D. mauritiana are more closely related to each other than to D. sechellia. (wikipedia.org)
  • Some species in this group have diverged recently, with evidence of introgression, showing similar morphological attributes that render their identification difficult, reinforcing the relevance of identifying new molecular markers that may differentiate species. (g3journal.org)
  • Delimiting Species-Poor Data Sets using Single Molecular Markers: A Study of Barcode Gaps, Haplowebs and GMYC. (semanticscholar.org)
  • Predicting community and species responses to disturbance is complicated by incomplete knowledge about species traits. (nih.gov)
  • Our data suggest that all GRD elements descend from a unique geminiviral integration event, most likely in a common ancestor of these Tomentosae species. (deepdyve.com)
  • Compared to DNA sequence evolution, relatively little is known about the character of gene expression evolution as species diverge. (diva-portal.org)
  • As a percentage of the total cumulative sequence in each species, LTR retrotransposons occupy 45.1% of the maize, 21.1% of the rice, and 3.7% of the sorghum regions. (biomedcentral.com)
  • This effect was independent of species richness, evenness, and abundance. (nih.gov)
  • Using general linear models, we attempted to explain the abundance of the species (as measured by the number of islands where recorded) from their congeneric status, and assessed whether the patterns could be alternatively accounted for by a range of biological, geographical and anthropogenic factors. (nerc.ac.uk)
  • Vision, like other biological attributes, is shaped by evolution through environmental pressures and demands, and even closely-related species that are in other ways very similar might respond to their particular environments by interpreting the visual world slightly differently, using photoreceptors that are attuned to particular wavelengths of light. (innovations-report.com)
  • This species was discovered by the fly geneticist Alfred Sturtevant in 1919, when he noticed that the flies used in Thomas Hunt Morgan's laboratory at the Columbia University were actually two distinct species: D. melanogaster and D. simulans. (wikipedia.org)
  • However, regional groups of P. mugo showed similar levels of LD and ρ/θ ratio to the other species. (nerc.ac.uk)
  • The study species, L. heterotoma, L. boulardi, and L. victoriae, occur sympatrically and have a similar ecology and life history. (uni-regensburg.de)
  • Presence or absence of congeners was assessed for all naturalized alien plants species at regional, local and habitat scales. (nerc.ac.uk)