Titre :

In situ assessment of the daily primary production of the temperate symbiotic coral Cladocora caespitose.

Auteur(s) :

Ferrier-Pagès, Christine [Auteur]
Gevaert, Francois [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Reynaud, S. [Auteur]
Beraud, E. [Auteur]
Menu, Dominique [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Janquin, Marie-Andrée [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Cocito, S. [Auteur]
Peirano, A. [Auteur]

Titre de la revue :

Limnology and Oceanography

Pagination :

1409-1418

Éditeur :

Association for the Sciences of Limnology and Oceanography

Date de publication :

2013

ISSN :

0024-3590

Discipline(s) HAL :

Planète et Univers [physics]/Sciences de la Terre/Océanographie

Résumé en anglais : [en]

We assessed the in situ daily primary production, photosynthetic efficiency, and xanthophyll cycling of a temperate coral, Cladocora caespitosa, during the summer using an in situ incubation chamber equipped with temperature, ...
Lire la suite >We assessed the in situ daily primary production, photosynthetic efficiency, and xanthophyll cycling of a temperate coral, Cladocora caespitosa, during the summer using an in situ incubation chamber equipped with temperature, oxygen, light, salinity, and pH sensors. During sunny days, photosynthetic carbon (C) production rates of C. caespitosa can be as high as those measured for tropical corals and rapidly follow changes in natural irradiance (from 200 to 1000 µmol photons m−2 s−1 within 2 h). As a consequence, daily production rates varied by a factor of 2 (from 150 and 260 µg C cm−2 d−1) depending on the irradiance received. Under high irradiance levels, corals can suffer from photoinhibition (light-induced reduction in the photosynthetic capacity), especially temperate species, which do not experience high irradiance levels most of the year. However, in C. caespitosa, photoinhibition at irradiances higher than 1000 µmol photons m−2 s−1 was reduced as a result of the involvement of the xanthophyll cycle, with a degree comparable to those measured for tropical species (de-epoxidation ratio of 0.12), that allowed C. caespitosa to maintain high production rates and a maximal autotrophic carbon acquisition during sunny days. However, as soon as irradiance conditions decreased below 200 µmol photons m−2 s−1 because of cloudy weather, autotrophically acquired carbon could not sustain respiratory needs, indicating that C. caespitosa has to rely on other sources, such as heterotrophy, to meet its energetic needs.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL