Publications des scientifiques de l'IRD

Van Wynsberge S., Andréfouët Serge, Gaertner-Mazouni N., Wabnitz C. C. C., Menoud M., Le Moullac G., Levy P., Gilbert A., Remoissenet G. (2017). Growth, survival and reproduction of the giant clama Tridacna maxima (Roding 1798, Bivalvia) in two contrasting lagoons in French Polynesia. Plos One, 12 (1), p. e0170565 [20 p.]. ISSN 1932-6203.

Titre du document
Growth, survival and reproduction of the giant clama Tridacna maxima (Roding 1798, Bivalvia) in two contrasting lagoons in French Polynesia
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000396160500028
Auteurs
Van Wynsberge S., Andréfouët Serge, Gaertner-Mazouni N., Wabnitz C. C. C., Menoud M., Le Moullac G., Levy P., Gilbert A., Remoissenet G.
Source
Plos One, 2017, 12 (1), p. e0170565 [20 p.] ISSN 1932-6203
Shell growth, reproduction, and natural mortality of the giant clam Tridacna maxima were characterized over a two-year-period in the lagoon of the high island of Tubuai (Austral Archipelago) and in the semi-closed lagoon of Tatakoto (Tuamotu Archipelago) in French Polynesia. We also recorded temperature, water level, tidal slope, tidal range, and mean wave height in both lagoons. Lower lagoon aperture and exposure to oceanic swells at Tatakoto than at Tubuai was responsible for lower lagoon water renewal, as well as higher variability in temperature and water level at Tatakoto across the studied period. These different environmental conditions had an impact on giant clams. Firstly, spawning events in the lagoon of Tatakoto, detected by gonad maturity indices in June and July 2014, were timed with high oceanic water inflow and a decrease in lagoon water temperature. Secondly, temperature explained differences in shell growth rates between seasons and lagoons, generating different growth curves for the two sites. Thirdly, local mortality rates were also found to likely be related to water renewal patterns. In conclusion, our study suggests that reef aperture and lagoon water renewal rates play an integral role in giant clam life history, with significant differences in rates of shell growth, mortality and fertility found between open versus semi-closed atoll lagoons in coral reef ecosystems.
Plan de classement
Ecologie, systèmes aquatiques [036] ; Ressources halieutiques [040]
Description Géographique
POLYNESIE FRANCAISE
Localisation
Fonds IRD [F B010069309]
Identifiant IRD
fdi:010069309
Contact