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Complex genetic structure revealed in the circum-Antarctic broadcast spawning sea urchin Sterechinus neumayeri

Miller, Karen J, Baird, Helena P, Van Oosterom, Jake, Mondon, Julie and King, Catherine K 2018, Complex genetic structure revealed in the circum-Antarctic broadcast spawning sea urchin Sterechinus neumayeri, Marine ecology progress series, vol. 601, pp. 153-166, doi: 10.3354/meps12648.

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Title Complex genetic structure revealed in the circum-Antarctic broadcast spawning sea urchin Sterechinus neumayeri
Author(s) Miller, Karen J
Baird, Helena P
Van Oosterom, Jake
Mondon, JulieORCID iD for Mondon, Julie orcid.org/0000-0002-0643-7540
King, Catherine K
Journal name Marine ecology progress series
Volume number 601
Start page 153
End page 166
Total pages 14
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2018-08-09
ISSN 0171-8630
Keyword(s) gene flow
larval dispersal
migration
chaotic genetic patchiness
microsatellites
echinoid
science & technology
life sciences & biomedicine
physical sciences
ecology
marine & freshwater biology
oceanography
environmental sciences & ecology
Summary Patterns and mechanisms of gene flow and larval dispersal in the Antarctic marine environment are still poorly understood, despite the current threat of rapid climate change and the need for such information to inform conservation and management efforts. Studies on Antarctic brooding marine invertebrates have demonstrated limited connectivity, concurrent with life history expectations; however, no equivalent data are available for broadcast spawning species for which we might expect a higher capacity for larval dispersal. Here, we have used microsatellite DNA markers and mitochondrial DNA sequence data to explore patterns of genetic structure and infer larval dispersal patterns across spatial scales of <500 m to 1400 km in the broadcast spawning sea urchin Sterechinus neumayeri. We show genetic differentiation at small spatial scales (<1 km), but genetic homogeneity over moderate (1-25 km) and large spatial scales (1000 km), consistent with patterns described as chaotic genetic patchiness. Self-recruitment appears common in S. neumayeri, and genotypes of larvae collected from the water column provide preliminary evidence that the adult population structure is maintained through variability among larval cohorts. Genetic similarity at large spatial scales may represent evolutionary connectivity on a circum-Antarctic scale, and likely also reflects a history of shelf recolonisation after isolation in glacial refugia.
Language eng
DOI 10.3354/meps12648
Field of Research 0602 Ecology
0608 Zoology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2018, The authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30113329

Document type: Journal Article
Collections: School of Life and Environmental Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.