Publications des scientifiques de l'IRD

Bell J. J., Shaffer M., Luter H. M., Mana R., Rodolfo-Metalpa Riccardo. (2022). Phototrophic sponge productivity may not be enhanced in a high CO2 world. Global Change Biology, [Early access], p. [12 p.]. ISSN 1354-1013.

Titre du document
Phototrophic sponge productivity may not be enhanced in a high CO2 world
Année de publication
2022
Type de document
Article référencé dans le Web of Science WOS:000806188000001
Auteurs
Bell J. J., Shaffer M., Luter H. M., Mana R., Rodolfo-Metalpa Riccardo
Source
Global Change Biology, 2022, [Early access], p. [12 p.] ISSN 1354-1013
Sponges are major components of benthic communities across the world and have been identified as potential "winners" on coral reefs in the face of global climate change as result of their tolerance to ocean warming and acidification (OA). Previous studies have also hypothesised that photosymbiont-containing sponges might have higher productivity under future OA conditions as a result of photosymbionts having increased access to CO2 and subsequently greater carbon production. Here we test this hypothesis for a widespread and abundant photosymbiont-containing sponge species Lamellodysidea herbacea at a CO2 seep in Papua New Guinea simulating OA conditions. We found seep sponges had relatively higher cyanobacterial abundance, chlorophyll concentrations and symbiont photosynthetic efficiency than non-seep sponges, and a three-fold higher sponge abundance at the seep site. However, while gross oxygen production was the same for seep and non-seep sponges, seep sponge dark respiration rates were higher and instantaneous photosynthesis: respiration (P:R) ratios were lower. We show that while photosymbiont containing sponges may not have increased productivity under OA, they are able to show flexibility in their relationships with microbes and offset increased metabolic costs associated with climate change associated stress.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Limnologie biologique / Océanographie biologique [034]
Description Géographique
PAPOUASIE NOUVELLE GUINEE
Localisation
Fonds IRD [F B010085224]
Identifiant IRD
fdi:010085224
Contact