Global drivers of recent diversification in a marine species complex

Silva, Catarina N.S., Murphy, Nicholas P., Bell, James J., Green, Bridget S,, Duhamel, Guy, Cockcroft, Andrew C., Hernández, Cristián E., and Strugnell, Jan M. (2021) Global drivers of recent diversification in a marine species complex. Molecular Ecology. (In Press)

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View at Publisher Website: http://doi.org/10.1111/mec.15780
 
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Abstract

Investigating historical gene flow in species complexes can indicate how environmental and reproductive barriers shape genome divergence during speciation. The processes influencing species diversification under environmental change remain one of the central focal points of evolutionary biology, particularly for marine organisms with high dispersal potential. We investigated genome‐wide divergence, introgression patterns and inferred demographic history between species pairs of all six extant rock lobster species (Jasus spp.), which have a long larval duration of up to two years and have populated continental shelf and seamount habitats around the globe at approximately 40oS. Genetic differentiation patterns reflected geographic isolation and the environment (i.e. habitat structure). Eastern Pacific species (J. caveorum and J. frontalis) were geographically more distant and genetically more differentiated from the remaining four species. Species associated with continental shelf habitats shared a common ancestry, but are geographically distant from one another. Similarly, species associated with island/seamount habitats in the Atlantic and Indian Oceans shared a common ancestry, but are also geographically distant. Benthic temperature was the environmental variable that explained most of the genetic differentiation (FST), while controlling for the effects of geographic distance. Eastern Pacific species retained a signal of strict isolation following ancient migration, whereas species pairs from Australia and Africa, and seamounts in the Indian and Atlantic oceans, included events of introgression after secondary contact. Our results reveal important effects of habitat and demographic processes on the recent divergence of species within the genus Jasus, providing one of the first empirical studies of genome‐wide drivers of diversification that incorporates all extant species in a marine genus with long pelagic larval duration.

Item ID: 65778
Item Type: Article (Research - C1)
ISSN: 1365-294X
Keywords: demographic inference; environmental association; genomics; Jasus spp.; lobsters; speciation with gene flow
Copyright Information: © 2020 John Wiley & Sons Ltd. The Author Accepted Manuscript is available from ResearchOnline@JCU from 21 December 2021. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Funders: Australian Research Council (ARC), Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
Projects and Grants: ARC grant DP150101491, FONDECYT grant 1170815
Date Deposited: 27 Jan 2021 09:35
FoR Codes: 31 BIOLOGICAL SCIENCES > 3104 Evolutionary biology > 310412 Speciation and extinction @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830206 Wild Caught Rock Lobster @ 100%
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