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- W4297460249 abstract "The endosymbiosis between most corals and their photosynthetic dinoflagellate partners begins early in the host life history, when corals are larvae or juvenile polyps. The capacity of coral larvae to buffer climate-induced stress while in the process of symbiont acquisition could come with physiological trade-offs that alter behaviour, development, settlement and survivorship. Here we examined the joint effects of thermal stress and symbiosis onset on colonization dynamics, survival, metamorphosis and host gene expression of Acropora digitifera larvae. We found that thermal stress decreased symbiont colonization of hosts by 50% and symbiont density by 98.5% over 2 weeks. Temperature and colonization also influenced larval survival and metamorphosis in an additive manner, where colonized larvae fared worse or prematurely metamorphosed more often than noncolonized larvae under thermal stress. Transcriptomic responses to colonization and thermal stress treatments were largely independent, while the interaction of these treatments revealed contrasting expression profiles of genes that function in the stress response, immunity, inflammation and cell cycle regulation. The combined treatment either cancelled or lowered the magnitude of expression of heat-stress responsive genes in the presence of symbionts, revealing a physiological cost to acquiring symbionts at the larval stage with elevated temperatures. In addition, host immune suppression, a hallmark of symbiosis onset under ambient temperature, turned to immune activation under heat stress. Thus, by integrating the physical environment and biotic pressures that mediate presettlement event in corals, our results suggest that colonization may hinder larval survival and recruitment under projected climate scenarios." @default.
- W4297460249 created "2022-09-29" @default.
- W4297460249 creator A5014287253 @default.
- W4297460249 creator A5061164176 @default.
- W4297460249 creator A5064949885 @default.
- W4297460249 creator A5069250617 @default.
- W4297460249 creator A5076315642 @default.
- W4297460249 creator A5081284588 @default.
- W4297460249 date "2022-10-17" @default.
- W4297460249 modified "2023-10-17" @default.
- W4297460249 title "Coral larvae suppress heat stress response during the onset of symbiosis decreasing their odds of survival" @default.
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