Concordant geographic and genetic structure revealed by genotyping-by-sequencing in a New Zealand marine isopod

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Authors
Pearman, W. S.
Wells, Sarah
Silander, O. K.
Freed, N. E.
Dale, J.
Author ORCID Profiles (clickable)
Degree
Grantor
Date
2020-08-26
Supervisors
Type
Journal Article
Ngā Upoko Tukutuku (Māori subject headings)
Keyword
New Zealand
Isocladus armatus
marine isopoda
genomics
evolution
genotyping by sequencing (GBS)
isolation-by-adaptation
isolation-by-distance
population genomics
isopods
RADseq
Citation
Pearman, W. S., Wells, S. J., Silander, O. K., Freed, N. E., & Dale, J. (2020). Concordant geographic and genetic structure revealed by genotyping-by-sequencing in a New Zealand marine isopod. Ecology and Evolution, Open access, 1-16. doi:10.1002/ece3.6802
Abstract
Population genetic structure in the marine environment can be influenced by lifehistory traits such as developmental mode (biphasic, with distinct adult and larval morphology, and direct development, in which larvae resemble adults) or habitat specificity, as well as geography and selection. Developmental mode is thought to significantly influence dispersal, with direct developers expected to have much lower dispersal potential. However, this prediction can be complicated by the presence of geophysical barriers to dispersal. In this study, we use a panel of 8,020 SNPs to investigate population structure and biogeography over multiple spatial scales for a direct- developing species, the New Zealand endemic marine isopod Isocladus armatus. Because our sampling range is intersected by two well-known biogeographic barriers (the East Cape and the Cook Strait), our study provides an opportunity to understand how such barriers influence dispersal in direct developers. On a small spatial scale (20 km), gene flow between locations is extremely high, suggestive of an island model of migration. However, over larger spatial scales (600 km), populations exhibit a clear pattern of isolation-by-distance. Our results indicate that I. armatus exhibits significant migration across the hypothesized barriers and suggest that large-scale ocean currents associated with these locations do not present a barrier to dispersal. Interestingly, we find evidence of a north-south population genetic break occurring between Māhia and Wellington. While no known geophysical barrier is apparent in this area, it coincides with the location of a proposed border between bioregions. Analysis of loci under selection revealed that both isolation-by-distance and adaption may be contributing to the degree of population structure we have observed here. We conclude that developmental life history largely predicts dispersal in the intertidal isopod I. armatus. However, localized biogeographic processes can disrupt this expectation, and this may explain the potential meta-population detected in the Auckland region.
Publisher
John Wiley & Sons Ltd.
Link to ePress publication
DOI
DOI: 10.1002/ece3.6802
Copyright holder
© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
Copyright notice
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium,provided the original work is properly cited.
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