Parallels between two geographically and ecologically disparate cave invasions by the same species, Asellus aquaticus (Isopoda, Crustacea)

Journal of Evolutionary Biology
M KonecP Trontelj

Abstract

Caves are long-known examples of evolutionary replications where similar morphologies (troglomorphies) evolve independently as the result of strong natural selection of the extreme environment. Recently, this paradigm has been challenged based on observations that troglomorphies are inconsistent across taxa and different subterranean habitats. We investigated the degree of replicated phenotypic change in two independent cave invasions by the freshwater isopod Asellus aquaticus; the first in a sulphidic aquifer in Romania, the second in a sinking river in the Dinaric Karst in Slovenia. Both ancestral surface populations still live alongside the subterranean ones. Phylogenetic analyses show independence of the two colonization events, and microsatellite analysis shows no evidence of ongoing genetic exchange between surface and subterranean ecomorphs. The overall morphology has changed dramatically at both sites (50 of 62 morphometric traits). The amount of phenotypic change did not reflect differences in genetic diversity between the two ancestral populations. Multivariate analyses revealed divergent evolution in caves, not parallel or convergent as predicted by the current paradigm. Still, 18 traits changed in a parallel fashion...Continue Reading

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Citations

Jan 14, 2016·Die Naturwissenschaften·Žiga FišerCene Fišer
Aug 10, 2016·Arthropod Structure & Development·Miloš VittoriJasna Štrus
Dec 9, 2017·BMC Evolutionary Biology·Jorge L Pérez-MorenoHeather D Bracken-Grissom
May 24, 2018·Integrative and Comparative Biology·Cassandra ReMeredith E Protas
Jun 23, 2018·Integrative and Comparative Biology·Jorge L Pérez-MorenoHeather D Bracken-Grissom
Aug 26, 2020·Biological Reviews of the Cambridge Philosophical Society·Stefano MammolaPedro Cardoso
Aug 24, 2021·Journal of Evolutionary Biology·Ester PremateCene Fišer

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