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The role of the endolithic alga Ostreobium spp. during coral bleaching recovery
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The role of the endolithic alga Ostreobium spp. during coral bleaching recovery
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Journal Article
The role of the endolithic alga Ostreobium spp. during coral bleaching recovery
2022
Overview
In this study, we explore how the Caribbean coral
Orbicella faveolata
recovers after bleaching, using fragments from 13 coral colonies exposed to heat stress (32 °C) for ten days. Biological parameters and coral optical properties were monitored during and after the stress. Increases in both, the excitation pressure over photosystem II (
Qm
) and pigment specific absorption (a*
Chl
a
) were observed in the stressed corals, associated with reductions in light absorption at the chlorophyll
a
red peak (
D
e675
) and symbiont population density. All coral fragments exposed to heat stress bleached but a fraction of the stressed corals recovered after removing the stress, as indicated by the reductions in
Q
m
and increases in
D
e675
and the symbiont population observed. This subsample of the experimentally bleached corals also showed blooms of the endolithic algae
Ostreobium
spp. underneath the tissue. Using a numerical model, we quantified the amount of incident light reflected by the coral, and absorbed by the different pigmented components: symbionts, host-tissue and
Ostreobium
spp. Our study supports the key contribution of
Ostreobium
spp
.
blooms near the skeletal surface, to coral recovery after bleaching by reducing skeleton reflectance. Endolithic blooms can thus significantly alleviate the high light stress that affects the remaining symbionts during the stress or when the coral has achieved the bleached phenotype.
