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1. Integration of population genetics with oceanographic models reveals strong connectivity among coral reefs across Seychelles

Author

April J. Burt, Noam Vogt-Vincent, Helen Johnson, Ashley Sendell-Price, Steve Kelly, Sonya M. Clegg, Catherine Head, Nancy Bunbury, Frauke Fleischer-Dogley, Marie-May Jeremie, Nasreen Khan, Richard Baxter, Gilberte Gendron, Christophe Mason-Parker, Rowana Walton, and Lindsay A. Turnbull

Subjects
Medicine, Science
Abstract

Abstract Many countries with tropical reef systems face hard choices preserving coral reefs in the face of climate change on limited budgets. One approach to maximising regional reef resilience is targeting management efforts and resources at reefs that export large numbers of larvae to other reefs. However, this requires reef connectivity to be quantified. To map coral connectivity in the Seychelles reef system we carried out a population genomic study of the Porites lutea species complex using 241 sequenced colonies from multiple islands. To identify oceanographic drivers of this connectivity and quantify variability, we further used a 2 km resolution regional ocean simulation coupled with a larval dispersal model to predict the flow of coral larvae between reef sites. Patterns of admixture and gene flow are broadly supported by model predictions, but the realised connectivity is greater than that predicted from model simulations. Both methods detected a biogeographic dispersal barrier between the Inner and Outer Islands of Seychelles. However, this barrier is permeable and substantial larval transport is possible across Seychelles, particularly for one of two putative species found in our genomic study. The broad agreement between predicted connectivity and observed genetic patterns supports the use of such larval dispersal simulations in reef system management in Seychelles and the wider region.

Published
2024
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2. The 2014-17 Global Coral Bleaching Event: The Most Severe and Widespread Coral Reef Destruction

Author

C. Mark Eakin, Denise Devotta, Scott Heron, Sean Connolly, Gang Liu, Erick Geiger, Jacqueline De La Cour, Andrea Gomez, William Skirving, Andrew Baird, Neal Cantin, Courtney Couch, Simon Donner, James Gilmour, Manuel Gonzalez-Rivero, Mishal Gudka, Hugo Harrison, Gregor Hodgson, Ove Hoegh-Guldberg, Andrew Hoey, Mia Hoogenboom, Terry Hughes, Meaghan Johnson, James Kerry, Jennifer Mihaly, Aarón Muñiz-Castillo, David Obura, Morgan Pratchett, Andrea Rivera-Sosa, Claire Ross, Jennifer Stein, Angus Thompson, Gergely Torda, T. Shay Viehman, Cory Walter, Shaun Wilson, Benjamin Marsh, Blake Spady, Noel Dyer, Thomas Adam, Mahsa Alidoostsalimi, Parisa Alidoostsalimi, Lorenzo Alvarez-Filip, Mariana Álvarez-Noriega, Keisha Bahr, Peter Barnes, José Barraza Sandoval, Julia Baum, Andrew Bauman, Maria Beger, Kathryn Berry, Pia Bessell-Browne, Lionel Bigot, Victor Bonito, Ole Brodnicke, David Burdick, Deron Burkepile, April Burt, John Burt, Ian Butler, Jamie Caldwell, Yannick Chancerelle, Chaolun Allen Chen, Kah-Leng Cherh, Michael Childress, Darren Coken, Georgia Coward, M. James Crabbe, Thomas Dallison, Steve Dalton, Thomas DeCarlo, Crawford Drury, Ian Drysdale, Clinton Edwards, Linda Eggertsen, Eylem Elma, Rosmin Ennis, Richard Evans, Gal Eyal, Douglas Fenner, Baruch Figueroa-Zavala, Jay Fisch, Michael Fox, Elena Gadoutsis, Antoine Gilbert, Andrew Halford, Tom Heintz, James Hewlett, Jean-Paul A. Hobbs, Whitney Hoot, Peter Houk, Lyza Johnston, Michelle Johnston, Hajime Kayanne, Emma Kennedy, Ruy Kikuchi, Ulrike Kloiber, Haruko Koike, Lindsey Kramer, Chao-Yang Kuo, Judy Lang, Abigail Leadbeater, Zelinda Leão, Jen Lee, Cynthia Lewis, Diego Lirman, Guilherme Longo, Chancey MacDonald, Sangeeta Mangubhai, Isabel da Silva, Christophe Mason-Parker, Vanessa McDonough, Melanie McField, Thayná Mello, Celine Miternique - Agathe, Stephan Moldzio, Alison Monroe, Monica Montefalcone, Kevin Moses, Pargol Ghavam Mostafavi, Rodrigo Moura, Chathurika Munasinghe, Takashi Nakamura, Jean-Benoit Nicet, Marissa Nuttall, Marilia Oliveira, Hazel Oxenford, John Pandolfi, Vardhan Patankar, Denise Perez, Nishan Perera, Derta Prabuning, William Precht, K. Diraviya Raj, James Reimer, Laura Richardson, Randi Rotjan, Nicole Ryan, Rod Salm, Stuart Sandin, Stephanie Schopmeyer, Mohammad Shokri, Jennifer Smith, Kylie Smith, S. R. Smith, Tyler Smith, Brigitte Sommer, Melina Soto, Helen Sykes, Kelley Tagarino, Marianne Teoh, Minh Thai, Tai Toh, Alex Tredinnick, Alex Tso, Harriet Tyley, Ali Ussi, Christian Vaterlaus, Mark Vermeij, Si Tuan Vo, Christian Voolstra, Hin Boo Wee, Bradley Weiler, Saleh Yahya, Thamasak Yeemin, Maren Ziegler, Tadashi Kimura, and Derek Manzello

Abstract

Ocean warming is increasing the incidence, scale, and severity of global-scale coral bleaching and mortality, culminating in the third global coral bleaching event that occurred during record marine heatwaves of 2014-2017. While local effects of these events have been widely reported, the global implications remain unknown. Analysis of 15,066 reef surveys during 2014-2017 revealed that 80% of surveyed reefs experienced significant coral bleaching and 35% experienced significant coral mortality. The global extent of significant coral bleaching and mortality was assessed by extrapolating results from reef surveys using comprehensive remote-sensing data of regional heat stress. This model predicted that 51% of the world’s coral reefs suffered significant bleaching and 15% significant mortality, surpassing damage from any prior global bleaching event. These observations demonstrate that global warming’s widespread damage to coral reefs is accelerating and underscores the threat anthropogenic climate change poses for the irreversible transformation of these essential ecosystems.

Published
2022
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3. Linking Protection with the Distribution of Grouper and Habitat Quality in Seychelles

Author

Christophe Mason-Parker, Richard Stafford, Matt Waller, Samantha Jane Howlett, and Sylvanna Antha

Subjects
0106 biological sciences, Anyperodon, Article Subject, Aquatic Science, 010603 evolutionary biology, 01 natural sciences, Epinephelus fasciatus, lcsh:Oceanography, Cephalopholis miniata, Grouper, lcsh:GC1-1581, Cephalopholis argus, lcsh:QH301-705.5, Ecology, Evolution, Behavior and Systematics, geography, geography.geographical_feature_category, biology, Ecology, 010604 marine biology & hydrobiology, fungi, Coral reef, biology.organism_classification, Aethaloperca rogaa, Fishery, lcsh:Biology (General), Animal Science and Zoology, Marine protected area
Abstract

Marine protected areas can be designated for a number of reasons, but exactly how they provide benefits is only recently being understood. We assessed the effect of protection on the size and distribution of six common species of grouper in a coral reef ecosystem. Data on live coral cover, coral genus diversity, and coral colony structure type were also compared to give an indication of reef quality between sites. A significant interaction was found forAethaloperca rogaaandCephalopholis nigripinnis, indicating that protected areas held greater numbers of smaller and median sized fish of these species than unprotected areas. Similar but nonsignificant trends were found forCephalopholis miniataandCephalopholis argus. ForAnyperodon leucogrammicus, MPAs held significantly more fish than unprotected sites, but as the increase was equal between size categories there was no interaction. The last speciesEpinephelus fasciatus,which was one of the smallest species, had no significant interaction, similar mean counts between protected and unprotected areas, and no obvious strong favouritism for particular sites with values indicating better reef quality, indicating intraspecies competition. The results of this study indicate that while the MPAs in this study are likely too small to benefit large groupers, the improvements to habitat quality have indirect benefits to groupers, especially at their earlier life stages.

Published
2016
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