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Communication Dans Un Congrès Année : 2008

Genetic parental analysis reveals both local retention and large scale connectivity of clownfish in Kimbe bay

G. Jones
  • Fonction : Auteur
S.R. Thorrold
  • Fonction : Auteur

Résumé

Many marine species produce larvae that can be pelagic for weeks or months and the potential for long distance dispersal by prevailing currents is extremely high. Marine populations have, in turn, been assumed to be demographically “open”, consisting of many sub-populations that are connected by larval dispersal. However recent work has consistently demonstrated high levels of self-recruitment in reef fish populations. Because of the technical difficulty of tracking larvae, direct measures of dispersal have not previously been obtained. We report on the potential of genetic parental analysis to estimate local self-recruitment and connectivity among distant areas by identifying the parent (and their location) of a new recruit settling at a certain location. We sampled (fin-clip) the entire adult population of clown fish (Amphiprion percula) from the reef around a small island, Kimbe Island, Papua New Guinea, together with new recruits from Kimbe Island and several other locations throughout Kimbe Bay. Parental analysis demonstrated significant self-recruitment (about 50%) to the Kimbe Island sub-population, but also significant connectivity among three distant locations within Kimbe Bay. As many as 10% of new recruits at these distant locations - up to 50km from Kimbe Island - were spawned by Kimbe Island adults. At small spatial scale, we observe strong retention (up to 50%) within small lagoon around Kimbe island that question about the ability of the species to achieve the pelagic larval phase within these lagoon. Finally, we demonstrate that some parents at specific sites within Kimbe Island were more efficient in producing self-recruitmenting juveniles than adults at other sites. Genetic parental analysis opens the possibility for new perspectives in understanding success of the larval phase and investigating process determining connectivity in the perspective of better management of marine populations
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Dates et versions

halsde-00329980 , version 1 (13-10-2008)

Identifiants

  • HAL Id : halsde-00329980 , version 1

Citer

S. Planes, G. Jones, S.R. Thorrold. Genetic parental analysis reveals both local retention and large scale connectivity of clownfish in Kimbe bay. 11th International Coral Reef Symposium, Jul 2008, Fort Lauderdale, United States. ⟨halsde-00329980⟩
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