Genetic structure of juvenile cohorts of bicolor damselfish (Stegastes partitus) along the Mesoamerican barrier reef: chaos through time

Hepburn, R. I.; Sale, Peter F.; Dixon, Brian; Heath, Daniel D.

doi:10.1007/s00338-008-0423-2

Cited by 24 publications

(34 citation statements)

References 42 publications

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“…A recent study of our populations showed that there were significant differences in allele frequency distributions among all of our sites, and weak but significant levels of genetic differentiation (Hogan et al 2010). Other studies support this, showing weak to strong genetic differentiation among populations of S. partitus in the MRBS region (Hepburn et al 2009;Salas et al 2010;VillegasSanchez et al 2010). Furthermore, our exclusion-assignment procedure is highly stringent and excludes individuals that have very common genotypes (those more likely to cause a false assignment).…”

Section: Discussionsupporting

confidence: 68%

“…At smaller spatial scales, Ospina-Guerrero et al (2008) found genetic homogeneity among sites within the Columbian Caribbean (*400 km), suggesting high levels of gene flow at this scale. However, three studies found weak (Hepburn et al 2009;Hogan et al 2010) to strong (Villegas-Sanchez et al 2010) genetic structuring at a similar scale in the MBRS, showing evidence of more restricted or variable gene flow. Christie et al (2010) found direct evidence of larval retention (i.e., self-recruitment) in Bahamian populations of S. partitus, on a backdrop of high gene flow among sites (*250 km).…”

Section: Introductionmentioning

confidence: 97%

“…Christie et al (2010) found direct evidence of larval retention (i.e., self-recruitment) in Bahamian populations of S. partitus, on a backdrop of high gene flow among sites (*250 km). Furthermore, two studies found that genetic structure among populations was temporally unstable at the scale of seasons (Hepburn et al 2009) and years (Hogan et al 2010), and this was attributed to fluctuations in connectivity among reefs (Hogan et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish

et al. 2011

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The persistence and resilience of marine populations in the face of disturbances is directly affected by connectivity among populations. Thus, understanding the magnitude and pattern of connections among populations and the temporal variation in these patterns is critical for the effective management and conservation of marine species. Despite recent advances in our understanding of marine connectivity, few empirical studies have directly measured the magnitude or pattern of connections among populations of marine fishes, and none have explicitly investigated temporal variation in demographic connectivity. We use genetic assignment tests to track the dispersal of 456 individual larval fishes to quantify the extent of connectivity, dispersal, self-recruitment and local retention within and among seven populations of a coral reef fish (Stegastes partitus) over a three-year period. We found that some larvae do disperse long distances (*200 km); however, self-recruitment was a regular phenomenon. Importantly, we found that dispersal distances, self-recruitment, local retention and the pattern of connectivity varied significantly among years. Our data highlight the unpredictable nature of connectivity, and underscore the need for more, temporally replicated, empirical measures of connectivity to inform management decisions.

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish

et al. 2011

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“…These discrepancies have several possible explanations related to the power of genetic analyses to resolve ecologically meaningful patterns. If genetic structure is present, but weak, then deciding whether populations are open or closed at the scale in question can be difficult (Hepburn et al, 2009). Moreover, though some of the factors producing population genetic structure are intimately related to demographic processes, others are not.…”

Section: The Double-edged Sword Of Molecular Ecologymentioning

confidence: 99%

“…When considering the pronounced variation in the biotic and abiotic factors determining dispersal, it is unsurprising that published estimates of connectivity and dispersal in coral reef fishes vary widely Purcell et al, 2006;Gerlach et al, 2007;Hepburn et al, 2009) and that no general relationship between spatial scale and the likelihood of populationlevel genetic divergence has emerged (Hepburn et al, 2009). Given the complexities and simplifying assumptions involved in equating gene flow with dispersal, this variability is partly a relic of the genetics methods used to estimate dispersal.…”

Section: How Do We Account For This Variability? a Model Of Passive Amentioning

confidence: 99%

Biogeography and Population Connectivity of Coral Reef Fishes

Morrison¹,

Sandin²

2011

Changing Diversity in Changing Environment

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Evidence of stable genetic structure across a remote island archipelago through self‐recruitment in a widely dispersed coral reef fish

Priest¹,

Halford²,

McIlwain³

2012

Ecology and Evolution

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We used microsatellite markers to assess the population genetic structure of the scribbled rabbitfish Siganus spinus in the western Pacific. This species is a culturally important food fish in the Mariana Archipelago and subject to high fishing pressure. Our primary hypothesis was to test whether the individuals resident in the southern Mariana Island chain were genetically distinct and hence should be managed as discrete stocks. In addition to spatial sampling of adults, newly-settled individuals were sampled on Guam over four recruitment events to assess the temporal stability of the observed spatial patterns, and evidence of self-recruitment. We found significant genetic structure in S. spinus across the western Pacific, with Bayesian analyses revealing three genetically distinct clusters: the southern Mariana Islands, east Micronesia, and the west Pacific; with the southern Mariana Islands being more strongly differentiated from the rest of the region. Analyses of temporal samples from Guam indicated the southern Mariana cluster was stable over time, with no genetic differentiation between adults versus recruits, or between samples collected across four separate recruitment events spanning 11 months. Subsequent assignment tests indicated seven recruits had self-recruited from within the Southern Mariana Islands population. Our results confirm the relative isolation of the southern Mariana Islands population and highlight how local processes can act to isolate populations that, by virtue of their broad-scale distribution, have been subject to traditionally high gene flows. Our results add to a growing consensus that self-recruitment is a highly significant influence on the population dynamics of tropical reef fish.

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Genetic structure of juvenile cohorts of bicolor damselfish (Stegastes partitus) along the Mesoamerican barrier reef: chaos through time

Cited by 24 publications

References 42 publications

Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish

Local retention, dispersal and fluctuating connectivity among populations of a coral reef fish

Biogeography and Population Connectivity of Coral Reef Fishes

Evidence of stable genetic structure across a remote island archipelago through self‐recruitment in a widely dispersed coral reef fish

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