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By observing the phenotypic response of fragments from 101 Acropora hyacinthus colonies based in Palau to short-term heat stress, we tested the reliability of short-term heat stress resistance, assays, and related resistance and recovery assays. Coral fragments were found to be in the yellow hues 16 hours post-heat stress for the next seven days, indicating that symbiont population sizes within corals can rapidly restore post-heat stress. Following short-term heat stress, rapid assays of the phenotypic response assays were useful measures of the total heat treatment effect, according to bleaching and mortality. These results help ease rapid, widespread heat sensitivity in Acropora hyacinthus by demonstrating that standardized short-term experiments can be safely assayed after 16 hours, and that bleaching sensitivity can be attributed to subsequent survival using experimental methods.
Source link: https://doi.org/10.1371/journal.pone.0269206
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