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Seasonal variation modulates coral sensibility to heat-stress and explains annual changes in coral productivity
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Seasonal variation modulates coral sensibility to heat-stress and explains annual changes in coral productivity
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Seasonal variation modulates coral sensibility to heat-stress and explains annual changes in coral productivity
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Journal Article
Seasonal variation modulates coral sensibility to heat-stress and explains annual changes in coral productivity
2017
Overview
The potential effects of seasonal acclimatization on coral sensitivity to heat-stress, has received limited attention despite differing bleaching thresholds for summer and winter. In this study, we examined the response of two contrasting phenotypes, termed winter and summer, of four Caribbean reef corals to similar light and heat-stress levels. The four species investigated were categorized into two groups: species with the ability to harbour large number of symbionts,
Orbicella annularis
and
O
.
faveolata
, and species with reduced symbiont density (
Montastraea cavernosa
and
Pseudodiploria strigosa
). The first group showed higher capacity to enhance photosynthetic rates per area (P
max
), while P
max
enhancement in the second group was more dependent on
Symbiodinium
performance (P
sym
). In summer all four species presented higher productivity, but also higher sensitivity to lose coral photosynthesis under heat-stress. In contrast, corals in winter exhibit symbionts with higher capacity to photoacclimate to the increased levels of light-stress elicited by heat-stress. Overall, our study supports the importance of the acclimatory coral condition in addition to the previous thermal history, to determine the severity of the impact of heat-stress on coral physiology, but also the dependence of this response on the particular structural and functional traits of the species.
