Population genetic analysis of Hypoplectrus coral reef fishes Provide evidence that local process are operating during the early stages of marine adaptive radations

Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Ancon, Panama.
Molecular Ecology (Impact Factor: 6.49). 04/2008; 17(6):1405-15. DOI: 10.1111/j.1365-294X.2007.03654.x
Source: PubMed


Large-scale, spatially explicit models of adaptive radiation suggest that the spatial genetic structure within a species sampled early in the evolutionary history of an adaptive radiation might be higher than the genetic differentiation between different species formed during the same radiation over all locations. Here we test this hypothesis with a spatial population genetic analysis of Hypoplectrus coral reef fishes (Serranidae), one of the few potential cases of a recent adaptive radiation documented in the marine realm. Microsatellite analyses of Hypoplectrus puella (barred hamlet) and Hypoplectrus nigricans (black hamlet) from Belize, Panama and Barbados validate the population genetic predictions at the regional scale for H. nigricans despite the potential for high levels of gene flow between populations resulting from the 3-week planktonic larval phase of Hypoplectrus. The results are different for H. puella, which is characterized by significantly lower levels of spatial genetic structure than H. nigricans. An extensive field survey of Hypoplectrus population densities complemented by individual-based simulations shows that the higher abundance and more continuous distribution of H. puella could account for the reduced spatial genetic structure within this species. The genetic and demographic data are also consistent with the hypothesis that H. puella might represent the ancestral form of the Hypoplectrus radiation, and that H. nigricans might have evolved repeatedly from H. puella through ecological speciation. Altogether, spatial genetic analysis within and between Hypoplectrus species indicate that local processes can operate at a regional scale within recent marine adaptive radiations.

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Available from: Frédéric Guichard
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    • "Adaptive radiations need to fulfill three requirements: multiplication of species and common descent, adaptation, and extraordinary diversification (Glor, 2010). There are relatively few described cases in marine fishes, such as the New Zealand triplefins (Hickey et al., 2009), California Sebastes rockfish (Johns and Avise, 1998), Antarctic notothenioids (Janko et al., 2011), Caribbean hamlets (Puebla et al., 2008) and South African clinids (von der Heyden et al., 2011). The paucity of adaptive radiations in marine fishes may be due to a number of factors including life history characteristics that are conducive to panmixia (Bernardi, 2013). "
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    • "Sampling locations were selected a priori based on predictions of biophysical models of larval dispersal (Cowen et al. 2006, Galindo et al. 2006) and genetic studies (Galindo et al. 2006, Acosta et al. Proceedings of the 65 th Gulf and Caribbean Fisheries Institute November 5 – 9, 2012 Santa Marta, Colombia 2008, Puebla et al. 2008, Landínez-García et al. 2009, Salas et al. 2010) across four regions: Region I. Colombian coastal areas (San Bernardo and Rosario archipelagos, and Tortugas Bank); Region II. San Andres archipelagosouthern section (South-South-West and East-South-East atolls); Region III. "
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