Warm‐adapted sponges resist thermal stress by reallocating carbon and nitrogen resources from cell turnover to somatic growth - Université de la Nouvelle-Calédonie Accéder directement au contenu
Article Dans Une Revue Limnology and Oceanography Année : 2024

Warm‐adapted sponges resist thermal stress by reallocating carbon and nitrogen resources from cell turnover to somatic growth

Résumé

Abstract Ocean warming will affect the functioning of coral reef ecosystems with unknown cascading effects. Any perturbation in the ability of sponges to recycle the dissolved organic matter released by primary producers and make it available to higher trophic levels, might have unknown consequences for the reef trophic chain. Biogeochemical processes were measured in the sponge Rhabdastrella globostellata from the semi‐enclosed lagoon of Bouraké, where temperatures reach 33.8°C and fluctuates by 6.5°C on a daily basis, and from a control reef (28°C). Using 13 C‐ and 15 N‐labeled coral mucus, we experimentally investigated to what extent high temperature affected the carbon (C) and nitrogen (N) resources allocation in the sponge tissue and detritus. Sponges from Bouraké maintained at 32°C incorporated more 13 C‐ and 15 N‐labeled coral mucus in the tissue and showed less detritus release when compared with sponges maintained at 28°C. In contrast, at 32°C control sponges showed lower 13 C‐ and 15 N‐labeled coral mucus incorporation in tissue and higher release of detritus. Our results suggest that sponges adapted to extreme temperatures of Bouraké were able to reallocate C and N resources from cell turnover to somatic growth and reduce tissue damage. In contrast, non‐adapted sponges at the control reef lack this mechanism and underwent tissue disintegration, highlighting the lethal effect of future warming. The change in C and N allocation in adapted sponges suggests a potential adaptation mechanism that allows R. globostellata to survive under thermal stress, but it could alter the availability of essential sources of energy with unknown consequences on the future reef trophic interactions.
Fichier principal
Vignette du fichier
Maggioni-etal-LimnolOcean-2024.pdf (4.08 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04493181 , version 1 (07-03-2024)

Identifiants

Citer

Maggioni Federica, Raimbault Patrick, Chateau Olivier, Pujo‐pay Mireille, Letourneur Yves, et al.. Warm‐adapted sponges resist thermal stress by reallocating carbon and nitrogen resources from cell turnover to somatic growth. Limnology and Oceanography, 2024, ⟨10.1002/lno.12542⟩. ⟨hal-04493181⟩
16 Consultations
6 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More