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67 results for “Speciation: genetics”
Data from: The quantitative genetics of incipient speciation: heritability and genetic correlations of skeletal traits in populations of diverging Favia fragum ecomorphs.
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Data from: Timeframes of speciation, reticulation, and hybridization in the Bulldog bat explained through phylogenetic analyses of all genetic transmission elements
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Data from: Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads
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Data from: Completing the hybridization triangle: the inheritance of genetic incompatibilities during homoploid hybrid speciation in ragworts (Senecio).
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Data from: The genetic basis of speciation in the Giliopsis lineage of Ipomopsis (Polemoniaceae)
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Data from: Genetic coupling of female mate choice with polygenic ecological divergence facilitates stickleback speciation
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Data from: The genetic architecture of reproductive isolation during speciation-with-gene-flow in lake whitefish species pairs assessed by RAD sequencing
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Data from: Genetic variability, local selection and demographic history: genomic evidence of evolving towards allopatric speciation in Asian seabass
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Data from: Hybrid speciation in sparrows I: phenotypic intermediacy, genetic admixture and barriers to gene flow
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Data from: A linkage disequilibrium perspective on the genetic mosaic of speciation in two hybridizing Mediterranean white oaks
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Data from: New SNPs for population genetic analysis reveal possible cryptic speciation of eastern Australian sea mullet (Mugil cephalus)
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Data from: Ecological speciation in sympatric palms: 3. genetic map reveals genomic islands underlying species divergence in Howea
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Data from: Interspecific genetics of speciation phenotypes: song and preference coevolution in Hawaiian crickets
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Data from: Population genetics and speciation of yellow-bellied, red-naped, and red-breasted sapsuckers (Sphyrapicus varius, S. nuchalis, and S. ruber)
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Data from: Are sympatrically speciating Midas cichlid fish special? Patterns of morphological and genetic variation in the closely related species Archocentrus centrarchus
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Data from: Speciation with gene flow and the genetics of habitat transitions
Whether speciation can advance to completion in the face of initially high levels of gene flow is a very controversial topic in evolutionary biology. Extensive gene exchange is generally considered to homogenize populations and counteract divergence. Moreover, the role of introgressive hybridization in evolution remains largely unexplored in animals, particularly in freshwater zooplankton in which allopatric speciation is considered to be the norm. Our work investigates the genetic structure of two young ecological species: the pond species, Daphnia pulex and the lake species, Daphnia pulicaria. Phylogenetic and population genetics analyses were conducted on mitochondrial NADH dehydrogenase 5 (ND5) gene, the nuclear Lactate dehydrogenase (Ldh) gene, and 21 nuclear microsatellite markers in 416 individuals from habitats with various degrees of permanence. The strong and consistent phylogenetic discordance between nuclear and mitochondrial markers suggests a complex evolutionary history of multiple independent habitat transition events that involved hybridization and introgression between lake and pond Daphnia. On the other hand, the low level of contemporary gene flow between adjacent populations indicates the presence of effective habitat isolating barriers. The Daphnia system provides strong evidence for a divergence-with-gene flow speciation model that involves multiple habitat transition events.
Data from: Genetic divergence and the number of hybridizing species affect the path to homoploid hybrid speciation
Hybridization is often maladaptive, and in some instances has led to the loss of biodiversity. However, hybridization can also promote speciation, such as during homoploid hybrid speciation, thereby generating biodiversity. Despite examples of homoploid hybrid species, the importance of hybridization as a speciation mechanism is still widely debated, and we lack a general understanding of the conditions most likely to generate homoploid hybrid species. Here we show that the level of genetic divergence between hybridizing species has a large effect on the probability that their hybrids evolve reproductive isolation. We find that populations of hybrids formed by parental species with intermediate levels of divergence were more likely to mate assortatively, and discriminate against their parental species, than those generated from weakly or strongly diverged parental species. Reproductive isolation was also found between hybrid populations, suggesting differential sorting of parental traits across populations. Finally, hybrid populations derived from three species were more likely to evolve reproductive isolation than those derived from two, supporting arguments that hybridization-supplied genetic diversity can lead to the evolution of novel "adaptive systems" and promote speciation. Our results illustrate when we expect hybridization and admixture to promote hybrid speciation. Whether homoploid hybrid speciation is a common speciation mechanism in general, remains an outstanding empirical question.
Substantial genetic divergence and lack of recent gene flow support cryptic speciation in a colour polymorphic bumble bee (Bombus bifarius) species complex
<p>Phenotypic polymorphism can constitute an inherent challenge for species delimitation. This issue is exemplified in bumble bees (<i>Bombus</i>), where species can exhibit high colour variation across their range, but otherwise exhibit little morphological variation to distinguish them from close relatives. We examine the species status of one of the most abundant North American bumble bees, <i>Bombus bifarius</i> Cresson, which historically was comprised of two major taxa, <i>bifarius</i> <i>s.s.</i> (<i>sensu stricto</i>) and <i>nearcticus</i>. These sublineages are recognized primarily by red and black variation in their mid-abdominal coloration, however, a continuum from black (<i>nearcticus</i>) to red (<i>bifarius s.s.</i>) variation has led to their historic synonymisation. Integrating mitochondrial and nuclear data and whole-genome sequencing, we reveal a high level of both mitochondrial and nuclear divergence delimiting two morphologically cryptic species – the red <i>bifarius s.s.</i> and the color variable (black to red) <i>nearcticus</i>. Population genomic analysis supports an absence of recent genomic admixture and a strong population structure between the two clades even in sympatry. Species distribution models predict partially differentiated niches between the genetically-inferred clades with annual precipitation being a leading differentiating variable. The<i> bifarius</i> <i>s.s. </i>lineage also occupies significantly higher elevations, with regions of sympatry being among the highest elevations in <i>nearcticus</i>. Our data also support a subspecies-level divergence between the broadly distributed <i>nearcticus</i> and the island population <i>vancouverensis</i>. In this paper, we formally recognize the two species, <i>Bombus</i> <i>bifarius</i> Cresson and <i>Bombus</i> <i>vancouverensis </i>Cresson, the latter including the subspecies <i>B. vancouverensis vancouverensis</i> <b>comb. n.</b> and <i>B. vancouverensis nearcticus</i> <b>comb. n</b>., with <i>vancouverensis </i>the name bearer due to year priority.</p> <p> </p>
Substantial genetic divergence and lack of recent gene flow support cryptic speciation in a colour polymorphic bumble bee (Bombus bifarius) species complex
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Data from: Genetic dissection of adaptive form and function in rapidly-speciating cichlid fishes
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.