Observations of migrant exchange and mixing in a coral reef fish metapopulation link scales of marine population connectivity

Horne, John B., van Herwerden, Lynne, Abellana, Sheena, and Mcilwain, Jennifer L. (2013) Observations of migrant exchange and mixing in a coral reef fish metapopulation link scales of marine population connectivity. Journal of Heredity, 104 (4). pp. 532-546.

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Much progress has been made toward understanding marine metapopulation dynamics, largely because of multilocus microsatellite surveys able to connect related individuals within the metapopulation. However, most studies are focused on small spatial scales, tens of kilometers, while demographic exchange at larger spatial scales remains poorly documented. Additionally, many small-scale demographic studies conflict with broad-scale phylogeographic patterns concerning levels of marine population connectivity, highlighting a need for data on more intermediate scales. Here, we investigated demographic recruitment processes of a commercially important coral reef fish, the bluespine unicornfish (Naso unicornis) using a suite of mitochondrial DNA (mtDNA) and microsatellite markers. Sampling for this study ranged across the southern Marianas Islands, a linear distance of 250 km and included 386 newly settled postlarval recruits. In contrast with other studies, we report that cohorts of recruits were genetically homogeneous in space and time, with no evidence of temporally stochastic sweepstakes reproduction. The genetic diversity of recruits was high and commensurate with that of the adult population. In addition, there is substantial evidence that 2 recruits, separated by 250 km, were full siblings. This is the largest direct observation of dispersal to date for a coral reef fish. All indications suggest that subpopulations of N. unicornis experience high levels of demographic migrant exchange and metapopulation mixing on a spatial scale of hundreds of kilometers, consistent with high levels of broad-scale genetic connectivity previously reported in this species.

Item ID: 28518
Item Type: Article (Research - C1)
ISSN: 1465-7333
Keywords: Acanthuridae, kinship, Micronesia, population connectivity, demographic recruitment, metapopulation dynamics, microsatellite surveys, large spatial scales, Naso unicornis, mtDNA, post-larval recruit cohorts, genetically homogeneous, space and time, sweepstakes reproduction, high genetic diversity, high demographic migrant exchange, high genetic connectivity
Funders: US Fish and Wildlife’s Federal Assistance in Sportfish Resto- ration Program to the Guam Department of Agriculture, James Cook University
Date Deposited: 08 Aug 2013 22:04
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 80%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 20%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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