Heat stress reduces the contribution of diazotrophs to coral holobiont nitrogen cycling.
Journal
The ISME journal
ISSN: 1751-7370
Titre abrégé: ISME J
Pays: England
ID NLM: 101301086
Informations de publication
Date de publication:
04 2022
04 2022
Historique:
received:
28
06
2021
accepted:
16
11
2021
revised:
11
11
2021
pubmed:
4
12
2021
medline:
13
4
2022
entrez:
3
12
2021
Statut:
ppublish
Résumé
Efficient nutrient cycling in the coral-algal symbiosis requires constant but limited nitrogen availability. Coral-associated diazotrophs, i.e., prokaryotes capable of fixing dinitrogen, may thus support productivity in a stable coral-algal symbiosis but could contribute to its breakdown when overstimulated. However, the effects of environmental conditions on diazotroph communities and their interaction with other members of the coral holobiont remain poorly understood. Here we assessed the effects of heat stress on diazotroph diversity and their contribution to holobiont nutrient cycling in the reef-building coral Stylophora pistillata from the central Red Sea. In a stable symbiotic state, we found that nitrogen fixation by coral-associated diazotrophs constitutes a source of nitrogen to the algal symbionts. Heat stress caused an increase in nitrogen fixation concomitant with a change in diazotroph communities. Yet, this additional fixed nitrogen was not assimilated by the coral tissue or the algal symbionts. We conclude that although diazotrophs may support coral holobiont functioning under low nitrogen availability, altered nutrient cycling during heat stress abates the dependence of the coral host and its algal symbionts on diazotroph-derived nitrogen. Consequently, the role of nitrogen fixation in the coral holobiont is strongly dependent on its nutritional status and varies dynamically with environmental conditions.
Identifiants
pubmed: 34857934
doi: 10.1038/s41396-021-01158-8
pii: 10.1038/s41396-021-01158-8
pmc: PMC8941099
doi:
Substances chimiques
Nitrogen
N762921K75
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1110-1118Subventions
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (Swiss National Science Foundation)
ID : 200021_179092
Organisme : Deutsche Forschungsgemeinschaft (German Research Foundation)
ID : 433042944
Organisme : Deutsche Forschungsgemeinschaft (German Research Foundation)
ID : 458901010
Informations de copyright
© 2021. The Author(s).
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