Heat stress reduces the contribution of diazotrophs to coral holobiont nitrogen cycling
| Autor: | Florian Roth, Jean-Baptiste Raina, Jeremy Bougoure, Nils Rädecker, Christian R. Voolstra, Mathieu Pernice, Laura Geißler, Gabriela Perna, Anny Cárdenas, Ulrich Struck, Hagen M. Gegner, Christian Wild, Claudia Pogoreutz, Paul Guagliardo, Anders Meibom |
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| Přispěvatelé: | Tvärminne Zoological Station, Biological stations |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
STYLOPHORA-PISTILLATA
Nutrient cycle Nitrogen Coral DIVERSITY Biology Stylophora pistillata Microbiology Heat stress Microbial ecology nitrogen cycling Symbiosis ddc:570 FIXING CYANOBACTERIA Nitrogen Fixation Animals natural sciences DINITROGEN FIXATION Nitrogen cycle Ecology Evolution Behavior and Systematics SYMBIOSES Coral Reefs Ecology fungi Climate-change ecology REEF CORALS technology industry and agriculture coral bleaching 500 Naturwissenschaften und Mathematik::570 Biowissenschaften Biologie::570 Biowissenschaften Biologie PERFORMANCE Nitrogen Cycle biochemical phenomena metabolism and nutrition Anthozoa biology.organism_classification ETHYLENE Holobiont coral microbiome 1181 Ecology evolutionary biology Nitrogen fixation ENDOLITHIC ALGAE 05 Environmental Sciences 06 Biological Sciences 10 Technology Diazotroph ENRICHMENT Heat-Shock Response geographic locations |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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