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60 results for “incipient speciation”
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: Inferring the degree of incipient speciation in secondary contact zones of closely related lineages of Palearctic green toads (Bufo viridis subgroup)
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Data from: Divergence is focused on few genomic regions early in speciation: incipient speciation of sunflower ecotypes
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Data from: Incipient speciation driven by hypertrophied lips in Midas cichlids fish?
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Data from: Post-glacial habitat release and incipient speciation in the genus Delphinus
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Data from: A probable case of incipient speciation in Schizocosa wolf spiders driven by allochrony, habitat use and female mate choice
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Incipient speciation and the impact on taxonomic decision: a case study using a sky island sister species pair of stag beetle (Lucanus; Lucanidae)
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Incipient speciation and secondary contact in a fossorial island endemic, the São Tomé caecilian
<p>Secondary contact of lineages in the early stages of divergence can result in lineage fusion or promote reproductive isolation through reinforcement. While these processes are well studied in many taxonomic groups, we know little about their contribution to diversification of the secretive and enigmatic caecilians (Amphibia: Gymnophiona). Here, we combine genetic (mtDNA and genome-wide SNPs) and phenotypic data to investigate the divergence history of caecilians endemic to the oceanic island of São Tomé in the Gulf of Guinea archipelago. Consistent with a previous mtDNA study, we find two phenotypically and genetically distinct lineages that occur along a north-to-south axis with extensive admixture in the centre of the island. Demographic modelling supports divergence in allopatry (~300 kya) followed by secondary contact (~95 kya). Contrary to a morphological study that interpreted latitudinal phenotypic variation in these caecilians as a cline within a single widespread species, our analyses suggest a history of allopatric lineage divergence and subsequent hybridization that may have blurred species boundaries. We propose that late Pleistocene volcanic activity favoured allopatric divergence between these lineages with local adaptation to climate maintaining a stable hybrid zone in the centre of São Tomé Island.</p>
Data from: The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks
Ecology can play a major role in species diversification. As individuals are adapting to contrasting habitats, reproductive barriers may evolve at multiple levels. While pre-mating barriers have been extensively studied, the evolution of post-mating reproductive isolation during early stages of ecological speciation remains poorly understood. In diverging three-spined stickleback ecotypes from two lakes and two rivers, we observed differences in sperm traits between lake and river males. Interestingly, these differences did not translate into ecotype-specific gamete precedence for sympatric males in competitive in vitro fertilization experiments, potentially owing to antagonistic compensatory effects. However, we observed indirect evidence for impeded development of inter-ecotype zygotes, possibly suggesting an early stage of genetic incompatibility between ecotypes. Our results show that pre-zygotic post-copulatory mechanisms play a minor role during this first stage of ecotype divergence, but suggest that genetic incompatibilities may arise at early stages of ecological speciation.
Data from: Experimental swap of Anopheles gambiae's assortative mating preferences demonstrates key role of X-chromosome divergence island in incipient sympatric speciation.
Although many theoretical models of sympatric speciation propose that genes responsible for assortative mating amongst incipient species should be associated with genomic regions protected from recombination, there are few data to support this theory. The malaria mosquito, Anopheles gambiae, is known for its sympatric cryptic species maintained by pre-mating reproductive isolation and its putative genomic islands of speciation, and is therefore an ideal model system for studying the genomic signature associated with incipient sympatric speciation. Here we selectively introgressed the island of divergence located in the pericentric region of the X chromosome of An. gambiae s.s. into its sister taxon An. coluzzii through 5 generations of backcrossing followed by two generations of crosses within the introgressed strains that resulted in An. coluzzii-like recombinant strains fixed for the M and S marker in the X chromosome island. The mating preference of recombinant strains was then tested by giving virgin recombinant individuals a choice of mates with X-islands matching and non-matching their own island type. We show through genetic analyses of transferred sperm that recombinant females consistently mated with matching island-type males thereby associating assortative mating genes with the X-island of divergence. Furthermore, full-genome sequencing confirmed that protein-coding differences between recombinant strains were limited to the experimentally swapped pericentromeric region. Finally, targeted-genome comparisons showed that a number of these unique differences were conserved in sympatric field populations, thereby revealing candidate speciation genes. The functional demonstration of a close association between speciation genes and the X-island of differentiation lends unprecedented support to island-of-speciation models of sympatric speciation facilitated by pericentric recombination suppression.
Fig. 6 in Incipient sympatric speciation via host race formation in Phengaris arion (Lepidoptera: Lycaenidae)
Fig. 6 Morphometric studies: a morphometric measurements – close curve on valva of male genitalia; b the results of morphometric analyses: the CVA scatterplots represent the group centroids of the samples; c box plots indicating the distribution of the centroid size. The abbreviations are the same as in Suppl. Table S1. The letter 'T' in the sample codes refers to spring arion, the letter 'N' indicates summer arion
Fig. 4 in Incipient sympatric speciation via host race formation in Phengaris arion (Lepidoptera: Lycaenidae)
Fig. 4 The number of effective migrants (Nm) between populations. Only those connections are shown where the number of migrants is greater than two. Thicker arrows indicate higher number of migrants. The abbreviations are the same as in Suppl. Table S1. The letter 'T' in the sample codes refers to spring arion, the letter 'N' indicates summer arion
Fig. 3 in Incipient sympatric speciation via host race formation in Phengaris arion (Lepidoptera: Lycaenidae)
Fig. 3 Results of the Bayesianclustering Structure analysis based on 9 microsatellite loci. Nm– the number of effective migrants between the syntopic sample pairs using private alleles. The abbreviations are the same as in Suppl. Table S1. The letter 'T' in the sample codes refers to spring arion, the letter 'N' indicates summer arion
Data from: Experimental swap of Anopheles gambiae's assortative mating preferences demonstrates key role of X-chromosome divergence island in incipient sympatric speciation.
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Data from: The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks
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Incipient speciation by divergent adaptation and antagonistic epistasis in yeast
GEO Series GSE6870. Saccharomyces cerevisiae. 8 samples. Type: Expression profiling by array.
The role of plasticity and adaptation on in the incipient speciation of a fire salamander population
GEO Series GSE139590. Salamandra salamandra. 72 samples. Type: Expression profiling by array.
Fig. 1 in Incipient sympatric speciation via host race formation in Phengaris arion (Lepidoptera: Lycaenidae)
Fig. 1 Syntopic sampling sites of spring and summer arion in the Aggtelek Karst region of Hungary
FIGURE 7 in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 7. Example of variable lateral blotch pigmentation within a single population of Etheostoma rupestre (Caffee Creek, Cahaba River watershed).
FIGURE 5. Wireframe diagrams for E. r. rupestre, E. r in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 5. Wireframe diagrams for E. r. rupestre, E. r. piersoni, and E. r. uphapeense.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.