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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Mar. Sci. | doi: 10.3389/fmars.2019.00691

The future of reef ecosystems in the Gulf of Mexico: insights from coupled climate model simulations and ancient hot-house reefs

 Sylvia G. Dee1*, Mark A. Torres1, Rowan C. Martindale2,  Anna M. Weiss2 and  Kristine L. DeLong3
  • 1Department of Earth, Environmental and Planetary Sciences, Rice University, United States
  • 2Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, United States
  • 3Department of Geography & Anthropology, College of Humanities & Social Sciences, Louisiana State University, United States

Shallow water coral reefs and deep sea coral communities are sensitive to current and future environmental stresses, such as changes in sea surface temperatures (SST), salinity, carbonate chemistry, and acidity. Over the last half-century, some reef communities have been disappearing at an alarming pace. This study focuses on the Gulf of Mexico, where the majority of shallow coral reefs are reported to be in poor or fair condition. We analyze the RCP8.5 ensemble of the Community Earth System Model v1.2 to identify monthly-to-decadal trends in mean Gulf of Mexico SST. Secondly, we examine projected changes in ocean pH, carbonate saturation state, and salinity in the same coupled model simulations. We find that the joint impacts of predicted higher temperatures and changes in ocean acidification will severely degrade Gulf of Mexico reef systems by the end of the 21st century. SSTs are likely to warm by 2.5 to 3C; while corals do show signs of an ability to evolve toward higher temperatures, current coral species and reef systems are likely to suffer major bleaching events in coming years. We contextualize future changes with ancient reefs from paleoclimate analogues, periods of Earth's past that were also exceptionally warm, specifically rapid ``hyperthermal" events. Ancient analogue events are often associated with extinctions, reef collapse, and significant ecological changes, yet reef communities managed to survive these events on evolutionary timescales. Finally, we review research which discusses the adaptive potential of the Gulf of Mexico's coral reefs, meccas of biodiversity and oceanic health. We assert that the only guaranteed solution for long-term conservation and recovery is substantial, rapid reduction of anthropogenic greenhouse gas emissions.

Keywords: Climate Change, coral reefs, Gulf of Mexico, Coral Bleaching, Paleoclimate analog, adaptation, ocean acidfication

Received: 24 Jul 2019; Accepted: 28 Oct 2019.

Copyright: © 2019 Dee, Torres, Martindale, Weiss and DeLong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Sylvia G. Dee, Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, 77005, Texas, United States, sylvia.dee@rice.edu