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Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster

Citation

Villacorta-Rath, C and Souza, CA and Murphy, NP and Green, BS and Gardner, C and Strugnell, JM, Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster, Molecular Ecology, 27, (1) pp. 54-65. ISSN 0962-1083 (2018) [Refereed Article]

Copyright Statement

© 2017 John Wiley

DOI: doi:10.1111/mec.14427

Abstract

Population structure of many marine organisms is spatially patchy and varies within and between years, a phenomenon defined as chaotic genetic patchiness. This results from the combination of planktonic larval dispersal and environmental stochasticity. Additionally, in species with bi-partite life, postsettlement selection can magnify these genetic differences. The high fecundity (up to 500,000 eggs annually) and protracted larval duration (12–24 months) and dispersal of the southern rock lobster, Jasus edwardsii, make it a good test species for chaotic genetic patchiness and selection during early benthic life. Here, we used double digest restriction site-associated DNA sequencing (ddRADseq) to investigate chaotic genetic patchiness and postsettlement selection in this species. We assessed differences in genetic structure and diversity of recently settled pueruli across four settlement years and between two sites in southeast Australia separated by approximately 1,000 km. Postsettlement selection was investigated by identifying loci under putative positive selection between recently settled pueruli and postpueruli and quantifying differences in the magnitude and strength of the selection at each year and site. Genetic differences within and among sites through time in neutral SNP markers indicated chaotic genetic patchiness. Recently settled puerulus at the southernmost site exhibited lower genetic diversity during years of low puerulus catches, further supporting this hypothesis. Finally, analyses of outlier SNPs detected fluctuations in the magnitude and strength of the markers putatively under positive selection over space and time. One locus under putative positive selection was consistent at both locations during the same years, suggesting the existence of weak postsettlement selection.

Item Details

Item Type:Refereed Article
Keywords:chaotic genetic patchiness, genetic fiversity, lobster, population structure, postsettlement selectionrock lobster, recruitment, Jasus
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fish Physiology and Genetics
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Rock Lobster
Author:Villacorta-Rath, C (Ms Cecilia Villacorta Rath)
Author:Green, BS (Associate Professor Bridget Green)
Author:Gardner, C (Professor Caleb Gardner)
ID Code:123017
Year Published:2018 (online first 2017)
Funding Support:Australian Research Council (LP120200164)
Web of Science® Times Cited:1
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2017-12-11
Last Modified:2018-03-20
Downloads:0

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