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

Villacorta-Rath, Cecilia, Souza, Carla A., Murphy, Nicholas P., Green, Bridget S., Gardner, Caleb, and Strugnell, Jan M. (2018) Temporal genetic patterns of diversity and structure evidence chaotic genetic patchiness in a spiny lobster. Molecular Ecology, 27 (1). pp. 54-65.

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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 ID: 56109
Item Type: Article (Refereed Research - C1)
Keywords: chaotic genetic patchiness, genetic diversity, lobster, population structure, postsettlement selection
Copyright Information: © 2017 John Wiley & Sons Ltd
ISSN: 1365-294X
Funders: Australian Research Council (ARC), Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil (CNPq)
Projects and Grants: ARC LP120200164, ARC DP150101491
Date Deposited: 12 Nov 2018 03:29
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 75%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050199 Ecological Applications not elsewhere classified @ 25%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830206 Wild Caught Rock Lobster @ 100%
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