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Dataset results
6 results for “speciation pump”
Data from: A low-latitude species pump: Peripheral isolation, parapatric speciation and mating-system evolution converge in a marine radiation
<p><span>Geologically recent radiation can shed light on speciation processes, but incomplete lineage sorting and introgressive gene flow render accurate evolutionary reconstruction and interpretation challenging. Independently evolving metapopulations of low-dispersal taxa may provide an additional level of phylogeographic information, given sufficiently broad sampling and genome-wide sequencing. Evolution in the marine brown algal genus </span><span>Fucus</span><span> in the south-eastern Atlantic was shaped by Quaternary climate-driven range shifts. Over this timescale, divergence and speciation occurred against a background of expansion-contraction cycles from multiple refugia, together with mating-system shifts from outcrossing (dioecy) to selfing hermaphroditism. We tested the hypothesis that peripheral isolation of range edge (dioecious) </span><span>F. vesiculosus</span><span> led to parapatric speciation and radiation of hermaphrodite lineages. Species tree methods using 876 single-copy nuclear genes and extensive geographic coverage produced conflicting topologies with respect to geographic clades of </span><span>F. vesiculosus</span><span>. All methods, however, revealed a new and early diverging hermaphrodite species, </span><span>Fucus macroguiryi</span><span> sp. Nov. Both the multispecies coalescent and polymorphism-aware models (in contrast to concatenation) support sequential paraphyly in </span><span>F. vesiculosus</span><span> resulting from distinct evolutionary processes. Our results support 1) peripheral isolation of the southern </span><span>F. vesiculosus</span><span> clade prior to parapatric speciation and radiation of hermaphrodite lineages – a "low latitude species pump". 2) Directional introgressive gene flow into </span><span>F. vesiculosus</span><span> around the present-day secondary contact zone (sympatric-allopatric boundary) between dioecious/hermaphrodite lineages as hermaphrodites expanded northwards, as supported by concordance analysis and statistical tests of introgression. Species boundaries in the extensive sympatric range are likely maintained by reproductive system (selfing in hermaphrodites) and reinforcement.</span></p>
Data from: A low-latitude species pump: Peripheral isolation, parapatric speciation and mating-system evolution converge in a marine radiation
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Data from: Genomic tests of the species-pump hypothesis: recent island connectivity cycles drive population divergence but not speciation in Caribbean crickets across the Virgin Islands
Harnessing the power of genomic scans, we test the debated 'species pump' hypothesis that implicates repeated cycles of island connectivity and isolation as drivers of divergence. This question has gone understudied given the limited resolution of past molecular markers for studying such dynamic phenomena. With an average of 32000 SNPs from the genome of 136 individuals from ten populations of a Caribbean flightless ground cricket species (Amphiacusta sanctaecrucis) and a complementary set of statistical approaches, we infer a stepping-stone colonization model and high levels of genetic differentiation across the Virgin Islands, which have been periodically inter-connected until 8 ka. Estimates of divergence times from models based on the site frequency spectrum coincide with a period of repeated connection and fragmentation of the islands at 75–130 ka. These results are consistent with a role of island connectivity cycles in promoting genomic divergence and indicate that the genetic distinctiveness of island populations has persisted despite subsequent and extended interisland connections identified from bathymetric data. We discuss these findings in the broader context of Caribbean biogeography, and more specifically why high levels of genomic divergence across the Virgin Islands associated with repeated connectivity cycles do not actually translate into species diversification.
Data from: Genomic tests of the species-pump hypothesis: recent island connectivity cycles drive population divergence but not speciation in Caribbean crickets across the Virgin Islands
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Data from: Glacial cycles as an allopatric speciation pump in North Eastern American freshwater fishes
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Data and code from: Amphibian speciation rates support a general role of mountains as biodiversity pumps
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