Genomic scale data shows that Parastacus nicoleti encompasses more than one species of burrowing continental crayfishes and that lineage divergence occurred with and without gene flow

Amador, Luís; Leaché, Adam D.; Victoriano, Pedro; Hickerson, Michael J.; D’Elı́a, Guillermo

doi:10.1016/j.ympev.2022.107443

Cited by 3 publications

(1 citation statement)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While substantial differences may exist between germ‐line mutation and long‐term substitution rates, this issue has not been evaluated in‐depth and recent studies have used values of 6e‐9–1e‐8 for amphibians and reptiles (see Burbrink, Bernstein, et al., 2022; Gehara et al., 2017 and references therein). Similarly, recent authors using GADMA employed rates of ~1–4e‐9 for analyses of butterflies, crustaceans, molluscs, and rodents (Agwamba & Nachman, 2023; Amador et al., 2022; Pazhenkova & Lukhtanov, 2021; Peluso et al., 2023). To account for this range of variation, we ran additional analyses with mutation rates of 2e‐9 and 1e‐8 to provide a range of parameter estimates under plausible empirical variation in substitution dynamics.…”

Section: Methodsmentioning

confidence: 99%

Discerning structure versus speciation in phylogeographic analysis of Seepage Salamanders (Desmognathus aeneus) using demography, environment, geography, and phenotype

Pyron,

Kakkera,

Beamer

et al. 2023

Molecular Ecology

View full text Add to dashboard Cite

Numerous mechanisms can drive speciation, including isolation by adaptation, distance, and environment. These forces can promote genetic and phenotypic differentiation of local populations, the formation of phylogeographic lineages, and ultimately, completed speciation. However, conceptually similar mechanisms may also result in stabilizing rather than diversifying selection, leading to lineage integration and the long‐term persistence of population structure within genetically cohesive species. Processes that drive the formation and maintenance of geographic genetic diversity while facilitating high rates of migration and limiting phenotypic differentiation may thereby result in population genetic structure that is not accompanied by reproductive isolation. We suggest that this framework can be applied more broadly to address the classic dilemma of “structure” versus “species” when evaluating phylogeographic diversity, unifying population genetics, species delimitation, and the underlying study of speciation. We demonstrate one such instance in the Seepage Salamander (Desmognathus aeneus) from the southeastern United States. Recent studies estimated up to 6.3% mitochondrial divergence and four phylogenomic lineages with broad admixture across geographic hybrid zones, which could potentially represent distinct species supported by our species‐delimitation analyses. However, while limited dispersal promotes substantial isolation by distance, microhabitat specificity appears to yield stabilizing selection on a single, uniform, ecologically mediated phenotype. As a result, climatic cycles promote recurrent contact between lineages and repeated instances of high migration through time. Subsequent hybridization is apparently not counteracted by adaptive differentiation limiting introgression, leaving a single unified species with deeply divergent phylogeographic lineages that nonetheless do not appear to represent incipient species.

show abstract