Reference : Morphological alterations of zooxanthellae in bleached cnidarian hosts
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/6020
Morphological alterations of zooxanthellae in bleached cnidarian hosts
English
[fr] Altérations morphologiques de zooxanthelles d'hôtes cnidaires atteints de blanchissement
Ladrière, Ophélie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Ecologie animale et écotoxicologie >]
Compère, Philippe mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement >]
Decloux, Nicole mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement >]
Vandewalle, Pierre mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Morphologie fonctionnelle et évolutive >]
Poulicek, Mathieu mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Ecologie animale et écotoxicologie >]
2008
Cahiers de Biologie Marine
CNRS - Cahiers de Biologie Marine
49
3
215-227
Yes (verified by ORBi)
International
0007-9723
Roscoff
France
[en] ultrastructure ; alterations ; symbiosis ; coral bleaching ; cnidarians ; zooxanthellae
[en] Studying the morphological changes of zooxanthellae in the host gastroderm is essential to understand the mechanisms of bleaching. Transmission electron microscopy was used to observe samples from four coral species-three collected from a barrier reef in Madagascar (Acropora digitifera (Dana, 1846), Echinopora hirsutissima Milne-Edwards & Haime, 1849 and Porites (Synaraea) rus Forskal, 1775)) and one cut from an aquarium-grown coral (Pocillopora damicornis (Linnaeus, 1758)-and from the hermatypic (zooxanthellae-containing) sea anemone Aiptasia pulchella (Carlgren, 1943). Zooxanthellae from bleached animals showed different stages of degradation or disorganization. Some were free, detached from the host gastroderm, associated or not with host-cell remains. Others were vacuolated, with abundant reserve material globules and angular holes probably created by the loss of crystalline material during cutting. Experimentally heat-shocked P. damicornis harboured, moreover, a greater number of dividing algae. Bleached individuals were found to vary as regards their response to stress, and zooxanthellae expelled from heat-shocked anemones showed a greater mitotic index and a higher survival rate than algae extracted or naturally externalized from healthy individuals. We propose a combination of morphological criteria for use in diagnosing the health state of algae-cnidarian symbiosis, so vulnerable in the case of bleaching.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/6020
also: http://hdl.handle.net/2268/93398

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