Observations of migrant exchange and mixing in a coral reef fish metapopulation link scales of marine population connectivity
MetadataShow full item record
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. © The American Genetic Association. 2013. All rights reserved.
Showing items related by title, author, creator and subject.
Chabanne, D.; Pollock, K.; Finn, Hugh; Bejder, L. (2017)Population structure must be considered when developing mark-recapture (MR) study designs as the sampling of individuals from multiple populations (or subpopulations) may increase heterogeneity in individual capture ...
Isolation of 15 new polymorphic microsatellite markers from the blue-spine unicornfish Naso unicornisHorne, J.; McIlwain, Jennifer; van Herwerden, L. (2010)The blue-spine unicornfish Naso unicornis is a widely distributed reef herbivore that is highly prized in tropical Indo-Pacific fisheries. Appropriate management for N. unicornis and other exploited reef fishes requires ...
Thomas, L.; Kennington, W.; Stat, Michael; Wilkinson, S.; Kool, J.; Kool, J.T.; Kendrick, G.; Kendrick, G. (2015)A detailed understanding of the genetic structure of populations and an accurate interpretation of processes driving contemporary patterns of gene flow are fundamental to successful spatial conservation management. The ...