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Poster (Scientific congresses and symposiums)
Heterogeneity of zooxanthellae density in the coral Acropora globiceps around Moorea (French Polynesia)
Ladrière, Ophélie; van Lierde, Elodie; Penin, Lucie et al.
200815th Benelux Congress of Zoology
 

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Abstract :
[en] Understanding the natural heterogeneity of coral zooxanthellae density appears as very important to understand variations in coral survival due to bleaching (the loss of these micro-algal symbionts). Heterogeneity of coral bleaching at different observation scales (within a colony, among neighbouring colonies of the same species or on a wider scale) remains largely misunderstood. The present work explores intracolonial, spatial and temporal variations of zooxanthellae density in the coral Acropora globiceps Dana 1846, over a period of three months on the forereef of Moorea, French Polynesia. In our study, intracolonial zooxanthellae densities did not vary significantly. However, zooxanthellae densities differed slightly between inner and outer branches but this trend was not significant at 6, 12 and 18 meters depth. On a wider scale, zooxanthellae densities also vary spatially : a positive correlation was observed between depth and symbiont density (density increases when light intensity decreases, so according to depth). Moreover, the location of colonies exposed to different hydrodynamical conditions was not a parameter controling the concentration of zooxanthellae. Finally, the temporal variation of zooxanthellae densities did not show significant variations even if it decreased slightly over the study period. The results of this study highlight the importance of accounting for variations within and among colonies to determine zooxanthellae densities and to assess the evolution of zooxanthellae populations.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Ladrière, Ophélie ;  Université de Liège - ULiège > R&D : Direction
van Lierde, Elodie
Penin, Lucie
Vidal-Dupiol, Jérémie
Adjeroud, Mehdi
Poulicek, Mathieu ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie animale et écotoxicologie
Language :
English
Title :
Heterogeneity of zooxanthellae density in the coral Acropora globiceps around Moorea (French Polynesia)
Publication date :
2008
Event name :
15th Benelux Congress of Zoology
Event organizer :
ULg - Université de Liège
Event place :
Liège, Belgium
Event date :
30-31/10/2008
Audience :
International
Available on ORBi :
since 24 January 2013

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