Multi-scale distribution and dynamics of bivalve larvae in a deep atoll lagoon (Ahe,French Polynesia) |
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| Institution: | 1. Department of Geological Sciences, University of Missouri, Columbia, MO, USA;4. Fachgruppe PaläoUmwelt, GeoZentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany;1. Institut de Recherche pour le Développement, UMR 9220 ENTROPIE (Institut de Recherche Pour le Développement, Université de la Réunion, IFREMER, Université de la Nouvelle-Calédonie, Centre National de la Recherche Scientifique), BP A5, 98848 Nouméa cedex, New Caledonia;2. Institut de Recherche pour le Développement, UMR 050 HydroSciences Montpellier, Université de Montpellier, France;3. Institut de Recherche pour le Développement, UMR 7329 Géoazur (Université de Nice Sophia Antipolis, Centre National de la Recherche Scientifique, Institut de Recherche Pour le Développement, Observatoire de la Côte d''Azur), BP A5, 98848 Nouméa cedex, New Caledonia;4. Ifremer, UMR 9220 ENTROPIE (Institut de Recherche Pour le Développement, Université de la Réunion, IFREMER, Université de la Nouvelle-Calédonie, Centre National de la Recherche Scientifique), BP A5, 98848 Nouméa cedex, New Caledonia;5. Geopolynésie, BP 44041, 98713 Papeete, French Polynesia;6. Georesources, Energy and Maritime Division, Pacific Community, Private Mail Bag, GPO, Suva, Fiji;7. Smith Geoscience Consultancy, Suva, Fiji;8. Direction des Ressources Marines, BP 20, 98713 Papeete, French Polynesia |
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| Abstract: | Bivalve larvae and hydrographic parameters were sampled over a range of spatio-temporal scales in a deep atoll lagoon. Bivalve larvae abundances were very high throughout the year: 18,550 m?3 in average. Larvae were (i) concentrated at mid-depth with nocturnal ascent and diurnal descent, (ii) heterogeneously dispersed at the lagoon scale, (iii) subject to day-to-day variation in abundance and (iv) transferred between different parts of the lagoon providing evidence of intra-lagoonal connectivity. The primacy of physical factors was seen on large spatial scale with the diluting effect of water renewal and transfers by hydrodynamics. On smaller spatial scale, the primacy of biological processes was recognised, with larval swimming activity leading to dial vertical migration correlated with food concentration. Variations in larval abundance were driven by bivalve reproductive activity correlated with meteorological conditions (i.e. windy periods). Finally, relationship between bivalve larvae patterns and pearl oyster (Pinctada margaritifera) settlement structuring is discussed. |
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