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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Global drivers of recent diversification in a marine species complex
Molecular Ecology, Volume 30, No. 5, Year 2021
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Description
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. © 2020 John Wiley & Sons Ltd
Authors & Co-Authors
Silva, Catarina Nunes Soares
Australia, Townsville
James Cook University
Murphy, Nicholas P.
Australia, Melbourne
La Trobe University
Bell, James J.
New Zealand, Wellington
Victoria University of Wellington
Green, Bridget S.
Australia, Hobart
University of Tasmania
Duhamel, Guy
France, Paris
Borea - Research Unit Biology of Aquatic Organisms and Ecosystems
Cockcroft, Andrew C.
Unknown Affiliation
Strugnell, Jan M.
Australia, Townsville
James Cook University
Australia, Melbourne
La Trobe University
Statistics
Citations: 7
Authors: 7
Affiliations: 7
Identifiers
Doi:
10.1111/mec.15780
ISSN:
09621083
Research Areas
Genetics And Genomics
Sexual And Reproductive Health