In:
Frontiers in Marine Science, Frontiers Media SA, Vol. 9 ( 2022-5-20)
Abstract:
Thermal stress is now considered the major recent cause of coral reef degradation; yet few studies have been conducted describing those effects on Southwestern Atlantic (SWA) reefs. The SWA represents a coral endemism hotspot with low-functional redundancy and therefore high extinction risk. Recent research has suggested a “thermal refuge” potential for SWA; however, evidence could suggest a different trend. We report herein an unprecedented coral mortality on the largest coastal Brazilian Marine Protected Area (MPA) following the worst thermal stress event since 1985. Degree Heating Week (DHW) values over 4.0 were observed for 107 days, averaging 8.70 for the period, with a maximum of 12.1. Average live coral cover was reduced by 18.1% while average turf algae cover increase by 19.3%. Mortality was highest for three coral species, with a mean mortality of 50.8% per transect for Millepora braziliensis , 32.6% for Mussismilia harttii and 16.6% for Millepora alcicornis . Our unique data for SWA indicates that the populations of two Brazilian endemic species ( Millepora braziliensis and Mussismilia harttii ) are under severe threat from global warming and that overall coral cover has been dramatically reduced. Hence, the idea of a possible “thermal” refugia within the SWA must be taken with caution for this coral endemism hotspot.
Type of Medium:
Online Resource
ISSN:
2296-7745
DOI:
10.3389/fmars.2022.725778
DOI:
10.3389/fmars.2022.725778.s001
DOI:
10.3389/fmars.2022.725778.s002
DOI:
10.3389/fmars.2022.725778.s003
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2022
detail.hit.zdb_id:
2757748-X
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