Cryptic diversity shapes coral symbioses, physiology, and response to thermal challenge
Aichelman, H. E.; Benson, B. E.; Gomez-Campo, K.; Martinez-Rugerio, M. I.; Fifer, J. E.; Tsang, L.; Hughes, A. M.; Bove, C. B.; Nieves, O. C.; Pereslete, A. M.; Stanizzi, D.; Kriefall, N. G.; Baumann, J. H.; Rippe, J. P.; Gondola, P.; Castillo, K. D.; Davies, S. W.
Show abstract
Coral persistence in the Anthropocene is shaped by interactions among holobiont partners (coral animals, microbial symbionts) and their environment. Cryptic coral lineages-genetically distinct yet morphologically similar groups-are critically important as they often exhibit functional diversity relevant to thermal tolerance. Additionally, environmental parameters such as thermal variability may promote tolerance, but how variability interacts with holobiont partners to shape responses to thermal challenge remains unclear. Here, we identified three cryptic lineages of Siderastrea siderea in Bocas del Toro, Panama that differ in distributions across inshore and offshore reefs, microbial associations, holobiont phenomes, and skeleton morphologies. A thermal variability experiment failed to increase thermal tolerance, but subsequent thermal challenge and recovery revealed one lineage maintained elevated energetic reserves, photochemical efficiency, and growth. Lastly, coral cores highlighted that this lineage also exhibited faster growth historically. Functional variation among cryptic lineages highlights their importance in predicting coral reef responses to climate change. TeaserCryptic host diversity drives coral phenotypes relevant to climate change.
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