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Objectives and background to the 1994 Franco-Australian expedition to Taiaro Atoll (Tuamotu Archipelago, French Polynesia) |
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| Authors: | R Galzin S Planes M Adjeroud C Chauvet P J Doherty J Poupin |
| Institution: | Centre de Biologie et d’Ecologie Tropicale et Mediterraneenne, Ecole Pratique des Hautes Etudes, URA CNRS 1453, Universite de Perpignan, 66860 Perpignan Cedex, France; Centre de Recherches Insulaires et Observatoire de l’Environnement, BP 1013, Moorea, Polynesie Fran?aise, FR Université Fran?aise du Pacifique, BP 4477, Noumea, New Caledonia, NC Australian Institute of Marine Science, PMB 3, Townsville, Q 4810, Australia, AU Service Mixte de Surveillance Radiologique et Biologique, B.P. 208, 91311 Monthlery Cedex, France, FR |
| Abstract: | The 9 km2 uplifted lagoon of Taiaro Atoll (15°45′S, 144°38′W) is hypersaline due to its isolation from the ocean, yet it contains a high diversity of fish. The question unifying our expedition was to discover whether these assemblages could be self-sustaining despite very limited contact with the ocean. Although we were constrained by time, collections of fish larvae showed that some species can complete their life-cycle within the lagoon, while others differed genetically between the lagoon and the ocean, consistent with restricted gene flow. The lagoon contained few oceanic species of zooplankton, confirming its general isolation, but nevertheless some fish species may depend upon infrequent colonisation from the ocean (when large waves drive water over the normally dry reef crest). Isotopic signatures in fish otoliths suggest the basis for a more definitive and inclusive test of the sources of the lagoonal assemblage. Accepted: 28 August 1997 |
| Keywords: | Coral reef fishes Surveys Life cycle Hydrodynamics Larval dispersal |
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