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Heat-tolerant coral may trade fast growth for resilience

November 17, 2023
in Science
Heat-tolerant coral may trade fast growth for resilience
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Heat tolerant coral may trade fast growth for resilience

Mariah Opalek at water tanks tending to coral experiments. Credit: Shayle Matsuda

Algae living within the soft tissue of coral supply much of the energy needed by their hosts, and some symbiotic algae help coral withstand warmer water better than others. In a recently published study led by the University of Hawai’i at Mānoa, researchers have found that there was a tradeoff for corals dominated by the thermally sensitive algae—they have higher growth, but only in cooler water.

The findings are published in the journal Coral Reefs.

“As the ocean continues to warm, understanding how symbionts and environmental factors affect coral growth and health will help predict reef futures and inform conservation interventions where coral stocks are selected for specific traits or symbionts,” said Shayle Matsuda, a doctoral student at the Hawai’i Institute of Marine Biology in the UH Mānoa School of Ocean and Earth Science and Technology at the time of the research.

The study was co-led by Matsuda, now a postdoctoral fellow at the Shedd Aquarium, and Mariah Opalek, who conducted the experiment for her undergraduate thesis at UH Mānoa. The research team investigated whether rice corals hosting symbiotic algae that can tolerate warmer water may grow more slowly, which could impact survivorship and competition for space on the reef, compared to coral hosting symbionts that are more susceptible to bleaching when ocean waters warm.

Over a two-month study period, the researchers measured the growth of rice corals dominated by heat-tolerant or heat-sensitive symbiotic algae. Additionally, they tested growth across decreasing light levels to see if the tradeoff between growth and tolerance to warm water would be affected by light, which is a major driver of the distribution of these symbionts in Kāneʻohe Bay, Hawai’i.

Heat tolerant coral may trade fast growth for resilience

Rice coral showing healthy coloration (left) and bleached portions (left). Credit: Shayle Matsuda

“This research shows us the complexity of coral growth on a reef,” said Opalek, who is now a grant support assistant at Kaua’i Community. “A coral’s competitive advantage could be lost in a matter of a few degrees depending on what type of symbiont they associate with.”

During the first month, when water temperatures were warmer, the symbiont present did not affect growth. However, over the cooler second month, corals with heat sensitive algae grew up to 77% faster than corals dominated by heat-tolerant algae, and this growth advantage increased in higher light treatments, which correlates to shallower depths on a reef.

“This means that the growth advantage associated with the thermally sensitive corals may only occur during a handful of the cooler months,” said Matsuda. “As ocean warming continues, it is likely that the advantage of hosting thermally tolerant symbionts outweighs any growth advantage hosting the thermally sensitive species might.”

More information:
Shayle B. Matsuda et al, Symbiont-mediated tradeoffs between growth and heat tolerance are modulated by light and temperature in the coral Montipora capitata, Coral Reefs (2023). DOI: 10.1007/s00338-023-02441-0

Citation:
Heat-tolerant coral may trade fast growth for resilience (2023, November 16)
retrieved 17 November 2023
from https://phys.org/news/2023-11-heat-tolerant-coral-fast-growth-resilience.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Tags: coralHeat-tolerantscience
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