Evolutionary Significant Units within Populations of Neotropical Broad-Snouted Caimans (Caiman latirostris, Daudin, 1802)

2018 ◽  
Vol 52 (3) ◽  
pp. 282-288
Author(s):  
Vitor S. Borges ◽  
Pamela C. Santiago ◽  
Nathália G. S. Lima ◽  
Marcos E. Coutinho ◽  
Paula C. Eterovick ◽  
...  
Keyword(s):  
Evolutionary Significant Units

scholarly journals Uncovering hidden specific diversity of Andean glassfrogs of theCentrolene buckleyispecies complex (Anura: Centrolenidae)

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5856 ◽  
Author(s):  
Luis Amador ◽  
Andrés Parada ◽  
Guillermo D’Elía ◽  
Juan M. Guayasamin
Keyword(s):  
Species Delimitation ◽  
Species Complex ◽  
Behavioral Data ◽  
Nuclear Markers ◽  
Evolutionary Significant Units ◽  
Candidate Species

The glassfrogCentrolene buckleyihas been recognized as a species complex. Herein, using coalescence-based species delimitation methods, we evaluate the specific diversity within this taxon. Four coalescence approaches (generalized mixed Yule coalescents, Bayesian general mixed Yule-coalescent, Poisson tree processes, and Bayesian Poisson tree processes) were consistent with the delimitation results, identifying four lineages within what is currently recognized asC. buckleyi. We propose three new candidate species that should be tested with nuclear markers, morphological, and behavioral data. In the meantime, for conservation purposes, candidate species should be considered evolutionary significant units, in light of observed population crashes in theC. buckleyispecies complex. Finally, our results support the validity ofC. venezuelense, formerly considered as a subspecies ofC. buckleyi.

scholarly journals New insights of zoogeographical distribution of Himalayan goral (Naemorhedus goral) from Indian Himalayan Region

2020 ◽  
Author(s):  
Bheem Dutt Joshi ◽  
Vinay Kumar Singh ◽  
Hemant Singh ◽  
Ashutosh Singh ◽  
Sujeet Kumar Singh ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Comparative Analysis ◽  
The Other ◽  
Valid Species ◽  
Central Himalaya ◽  
Indian Himalayan Region ◽  
Evolutionary Significant Units ◽  
Wide Range ◽  
Conservation And Management

ABSTRACTIn the present study, we explored the intraspecific genetic variation and phylogeographic relationship among all the reported species in the genus Naemorhedus distributed in a wide range of habitats. The Bayesian based phylogeny demonstrated that Himalayan goral, is a highly diverged species from the other reported species of gorals. We claim the presence of two valid sub-species of Himalayan goral, i.e. N. g. bedfordi and N. g. goral, distributed in the western and central Himalaya, respectively. The comparative analysis with the inclusion of data available from different ranges, suggests the presence of plausibly six species of gorals across the distribution with a few valid subspecies. Further, we report that N. griseus is a valid species and not the synonyms of N. goral considering the observed discrepancy in the available sequences. We recommend all the sub-species present at distant locations may be considered as Evolutionary Significant Units (ESUs) and, therefore, appeal to provide them special attention for long term conservation and management.

Divergent lineages in the heath mouse (Pseudomys shortridgei) are indicative of major contraction to geographically isolated refugia on the eastern and western sides of Australia during the early Pleistocene

2009 ◽  
Vol 57 (1) ◽  
pp. 41 ◽  
Author(s):  
Maria Salinas ◽  
Michael Bunce ◽  
Damien Cancilla ◽  
Deryn L. Alpers ◽  
Peter B. S. Spencer
Keyword(s):  
Genetic Diversity ◽  
Western Australia ◽  
Early Pleistocene ◽  
Evolutionary Significant Units ◽  
Australian Continent ◽  
D Loop ◽  
Nuclear Microsatellite ◽  
Genetic Clusters ◽  
Significant Divergence ◽  
Nuclear Loci

The heath mouse (Pseudomys shortridgei) is a locally rare species; it was considered extinct in Western Australia until its rediscovery 20 years ago. It is not often detected in faunal surveys and is confined to two ecologically distinct habitats on either side of the Australian continent. An important and immediate conservation question has been to determine the genetic diversity within each of its current habitats and to determine the differences between the geographically separate populations. Measures of genetic differentiation amongst P. shortridgei populations in their eastern (Victoria) and western (Western Australia) distribution were estimated using nuclear (microsatellite loci) and partial sequence of mitochondrial DNA (427 bp Cytochrome b gene and 637 bp of the D-loop). Both markers identified differences between the east- and west-coast populations. MtDNA data showed significant divergence between populations with monophyly within them, and nuclear loci investigated also showed two clear genetic clusters based on Bayesian inference. As a result of these findings, we suggest that the heath mouse comprises two highly divergent (but genetically diverse) lineages and the aridity of the Nullarbor Plain has clearly been a barrier for dispersal since the early Pleistocene (~1.43 million years ago). The populations either side of the Nullarbor Plain are genetically differentiated and should be defined as separate Evolutionary Significant Units (ESUs).

scholarly journals A Molecular Perspective on Systematics, Taxonomy and Classification Amazonian Discus Fishes of the Genus Symphysodon

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
Manuella Villar Amado ◽  
Izeni P. Farias ◽  
Tomas Hrbek
Keyword(s):  
Genetic Structure ◽  
Habitat Use ◽  
Bayesian Analysis ◽  
Microsatellite Markers ◽  
Cichlid Fishes ◽  
Genetic Groups ◽  
Evolutionary Significant Units ◽  
Nuclear Microsatellite ◽  
Biological Group ◽  
Mtdna Haplotype

With the goal of contributing to the taxonomy and systematics of the Neotropical cichlid fishes of the genus Symphysodon, we analyzed 336 individuals from 24 localities throughout the entire distributional range of the genus. We analyzed variation at 13 nuclear microsatellite markers, and subjected the data to Bayesian analysis of genetic structure. The results indicate that Symphysodon is composed of four genetic groups: group PURPLE—phenotype Heckel and abacaxi; group GREEN—phenotype green; group RED—phenotype blue and brown; and group PINK—populations of Xingú and Cametá. Although the phenotypes blue and brown are predominantly biological group RED, they also have substantial contributions from other biological groups, and the patterns of admixture of the two phenotypes are different. The two phenotypes are further characterized by distinct and divergent mtDNA haplotype groups, and show differences in mean habitat use measured as pH and conductivity. Differences in mean habitat use is also observed between most other biological groups. We therefore conclude that Symphysodon comprises five evolutionary significant units: Symphysodon discus (Heckel and abacaxi phenotypes), S. aequifasciatus (brown phenotype), S. tarzoo (green phenotype), Symphysodon sp. 1 (blue phenotype) and Symphysodon sp. 2 (Xingú group).

scholarly journals Genetic differentiation in the genus Characodon: implications for conservation and taxonomy

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11492
Author(s):  
Rosa G. Beltrán-López ◽  
Rodolfo Pérez-Rodríguez ◽  
Ofelia C. Montañez-García ◽  
Juan M. Artigas-Azas ◽  
Michael Köck ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Evolutionary History ◽  
Genetic Distances ◽  
Genetic Groups ◽  
Evolutionary Significant Units ◽  
Significant Genetic Structure ◽  
D Loop ◽  
History Of ◽  
The Subject ◽  
Phylogeographic Study

The subfamily Goodeinae is a group of fishes endemic to the Mexican highlands. Most of the species are restricted to small and isolated streams or springs. Within this subfamily, the genus Characodon is the earliest diverging lineage of which three species have been described: C. lateralis, C. audax, and C. garmani, with the latter, considered extinct. Characodon lateralis and C. audax are classed as endangered, and have been the subject of taxonomic controversy since their description: previous studies have recognized a genetic differentiation in two groups separated by the El Salto waterfall, but morphological analyses contradict these genetic results. We perform a phylogeographic study using the mitochondrial cytb gene and d-loop region to elucidate the evolutionary history of C. lateralis and C. audax. The results with both markers show the presence of two highly differentiated haplogroups; one distributed north and the other distributed south of the waterfall, with genetic distances of 1.7 and 13.1% with cytb and d-loop respectively, and divergence calculated to have occurred 1.41 Mya. Significant genetic structure was found within each haplogroup and suggests the existence of at least four Evolutionary Significant Units (ESUs) within the examined populations. The possible processes identified as contributing to the formation of differentiated genetic groups are isolation, low population size, recurrent bottlenecks, and the strong sexual selection exhibited by the genus.

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