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1. Asynchronous effects of heat stress on growth rates of massive corals and damselfish in the Red Sea.

Author

Zahid, Fiza, Gajdzik, Laura, Korsmeyer, Keith E., Cotton, Jordyn D., Coker, Daren J., Berumen, Michael L., and DeCarlo, Thomas M.

Subjects
*BIOTIC communities, *MARINE biology, *CORAL reef fishes, *ECOLOGICAL disturbances, *CORAL reefs & islands, *CORAL bleaching
Abstract

Climate change is imposing multiple stressors on marine life, leading to a restructuring of ecological communities as species exhibit differential sensitivities to these stressors. With the ocean warming and wind patterns shifting, processes that drive thermal variations in coastal regions, such as marine heatwaves and upwelling events, can change in frequency, timing, duration, and severity. These changes in environmental parameters can physiologically impact organisms residing in these habitats. Here, we investigate the synchrony of coral and reef fish responses to environmental disturbance in the Red Sea, including an unprecedented combination of heat stress and upwelling that led to mass coral bleaching in 2015. We developed cross-dated growth chronologies from otoliths of 156 individuals of two planktivorous damselfish species, Pomacentrus sulfureus and Amblyglyphidodon flavilatus, and from skeletal cores of 48 Porites spp. coral colonies. During and immediately after the 2015 upwelling and bleaching event, damselfishes exhibited a positive growth anomaly but corals displayed reduced growth. Yet, after 2015–2016, these patterns were reversed with damselfishes showing a decline in growth and corals rebounding to pre-disturbance growth rates. Our results reveal an asynchronous response between corals and reef fish, with corals succumbing to the direct effects of heat stress, and then quickly recovering when the heat stress subsided—at least, for those corals that survived the bleaching event. Conversely, damselfish growth temporarily benefited from the events of 2015, potentially due to the increased metabolic demand from increased temperature and increased food supply from the upwelling event, before declining over four years, possibly related to indirect effects associated with habitat degradation following coral mortality. Overall, our study highlights the increasingly complex, often asynchronous, ecological ramifications of climate extremes on the diverse species assemblages of coral reefs. [ABSTRACT FROM AUTHOR]

Published
2025
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4. Evidence for managing herbivores for reef resilience

Author

Donovan, Mary K., primary, Counsell, Chelsie W. W., additional, Donahue, Megan J., additional, Lecky, Joey, additional, Gajdzik, Laura, additional, Marcoux, Stacia D., additional, Sparks, Russell, additional, and Teague, Christopher, additional

Published
2023
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6. Widespread diversity deficits of coral reef sharks and rays

Author

Simpfendorfer, Colin A., Heithaus, Michael R., Heupel, Michelle R., Macneil, M.A., Meekan, Mark, Harvey, Euan, Sherman, C.S., Currey-Randall, Leanne M., Goetze, Jordan S., Kiszka, Jeremy J., Rees, Matthew J., Speed, Conrad W., Udyawer, Vinay, Bond, Mark E., Flowers, Kathryn I., Clementi, Gina M., Valentin-Albanese, Jasmine, Adam, M.S., Ali, Khadeeja, Asher, Jacob, Aylagas, Eva, Beaufort, Océane, Benjamin, Cecilie, Bernard, Anthony T.F., Berumen, Michael L., Bierwagen, Stacy, Birrell, Chico, Bonnema, Erika, Bown, Rosalind M.K., Brooks, Edward J., Brown, J.J., Buddo, Dayne, Burke, Patrick J., Cáceres, Camila, Cambra, Marta, Cardeñosa, Diego, Carrier, Jeffrey C., Casareto, Sara, Caselle, Jennifer E., Charloo, Venkatesh, Cinner, Joshua E., Claverie, Thomas, Clua, Eric E.G., Cochran, Jesse E.M., Cook, Neil, Cramp, Jessica E., d’Alberto, Brooke M., de Graaf, Martin, Dornhege, Mareike C., Espinoza, Mario, Estep, Andy, Fanovich, Lanya, Farabaugh, Naomi F., Fernando, Daniel, Ferreira, Carlos E.L., Fields, Candace Y.A., Flam, Anna L., Floros, Camilla, Fourqurean, Virginia, Gajdzik, Laura, García Barcia, Laura, Garla, Ricardo, Gastrich, Kirk, George, Lachlan, Giarrizzo, Tommaso, Graham, Rory, Guttridge, Tristan L., Hagan, Valerie, Hardenstine, Royale S., Heck, Stephen M., Henderson, Aaron C., Heithaus, Patricia, Hertler, Heidi, Hoyos Padilla, Mauricio, Hueter, Robert E., Jabado, Rima W., Joyeux, Jean-Christophe, Jaiteh, Vanessa, Johnson, Mohini, Jupiter, Stacy D., Kaimuddin, Muslimin, Kasana, Devanshi, Kelley, Megan, Kessel, Steven T., Kiilu, Benedict, Kirata, Taratau, Kuguru, Baraka, Kyne, Fabian, Langlois, Tim, Lara, Frida, Lawe, Jaedon, Lédée, Elodie J.I., Lindfield, Steve, Luna-Acosta, Andrea, Maggs, Jade Q., Manjaji-Matsumoto, B.M., Marshall, Andrea, Martin, Lucy, Mateos-Molina, Daniel, Matich, Philip, Mccombs, Erin, Mcivor, Ashlie, Mclean, Dianne, Meggs, Llewelyn, Moore, Stephen, Mukherji, Sushmita, Murray, Ryan, Newman, Stephen J., Nogués, Josep, Obota, Clay, Ochavillo, Domingo, O'Shea, Owen, Osuka, Kennedy E., Papastamatiou, Yannis P., Perera, Nishan, Peterson, Bradley, Pimentel, Caio R., Pina-Amargós, Fabián, Pinheiro, Hudson T., Ponzo, Alessandro, Prasetyo, Andhika, Quamar, L.M.S., Quinlan, Jessica R., Reis-Filho, José Amorim, Ruiz, Hector, Ruiz-Abierno, Alexei, Sala, Enric, Salinas-de-León, Pelayo, Samoilys, Melita A., Sample, William R., Schärer-Umpierre, Michelle, Schlaff, Audrey M., Schmid, Kurt, Schoen, Sara N., Simpson, Nikola, Smith, Adam N.H., Spaet, Julia L.Y., Sparks, Lauren, Stoffers, Twan, Tanna, Akshay, Torres, Rubén, Travers, Michael J., van Zinnicq Bergmann, Maurits, Vigliola, Laurent, Ward, Juney, Warren, Joseph D., Watts, Alexandra M., Wen, Colin K., Whitman, Elizabeth R., Wirsing, Aaron J., Wothke, Aljoscha, Zarza-González, Esteban, Chapman, Demian D., Simpfendorfer, Colin A., Heithaus, Michael R., Heupel, Michelle R., Macneil, M.A., Meekan, Mark, Harvey, Euan, Sherman, C.S., Currey-Randall, Leanne M., Goetze, Jordan S., Kiszka, Jeremy J., Rees, Matthew J., Speed, Conrad W., Udyawer, Vinay, Bond, Mark E., Flowers, Kathryn I., Clementi, Gina M., Valentin-Albanese, Jasmine, Adam, M.S., Ali, Khadeeja, Asher, Jacob, Aylagas, Eva, Beaufort, Océane, Benjamin, Cecilie, Bernard, Anthony T.F., Berumen, Michael L., Bierwagen, Stacy, Birrell, Chico, Bonnema, Erika, Bown, Rosalind M.K., Brooks, Edward J., Brown, J.J., Buddo, Dayne, Burke, Patrick J., Cáceres, Camila, Cambra, Marta, Cardeñosa, Diego, Carrier, Jeffrey C., Casareto, Sara, Caselle, Jennifer E., Charloo, Venkatesh, Cinner, Joshua E., Claverie, Thomas, Clua, Eric E.G., Cochran, Jesse E.M., Cook, Neil, Cramp, Jessica E., d’Alberto, Brooke M., de Graaf, Martin, Dornhege, Mareike C., Espinoza, Mario, Estep, Andy, Fanovich, Lanya, Farabaugh, Naomi F., Fernando, Daniel, Ferreira, Carlos E.L., Fields, Candace Y.A., Flam, Anna L., Floros, Camilla, Fourqurean, Virginia, Gajdzik, Laura, García Barcia, Laura, Garla, Ricardo, Gastrich, Kirk, George, Lachlan, Giarrizzo, Tommaso, Graham, Rory, Guttridge, Tristan L., Hagan, Valerie, Hardenstine, Royale S., Heck, Stephen M., Henderson, Aaron C., Heithaus, Patricia, Hertler, Heidi, Hoyos Padilla, Mauricio, Hueter, Robert E., Jabado, Rima W., Joyeux, Jean-Christophe, Jaiteh, Vanessa, Johnson, Mohini, Jupiter, Stacy D., Kaimuddin, Muslimin, Kasana, Devanshi, Kelley, Megan, Kessel, Steven T., Kiilu, Benedict, Kirata, Taratau, Kuguru, Baraka, Kyne, Fabian, Langlois, Tim, Lara, Frida, Lawe, Jaedon, Lédée, Elodie J.I., Lindfield, Steve, Luna-Acosta, Andrea, Maggs, Jade Q., Manjaji-Matsumoto, B.M., Marshall, Andrea, Martin, Lucy, Mateos-Molina, Daniel, Matich, Philip, Mccombs, Erin, Mcivor, Ashlie, Mclean, Dianne, Meggs, Llewelyn, Moore, Stephen, Mukherji, Sushmita, Murray, Ryan, Newman, Stephen J., Nogués, Josep, Obota, Clay, Ochavillo, Domingo, O'Shea, Owen, Osuka, Kennedy E., Papastamatiou, Yannis P., Perera, Nishan, Peterson, Bradley, Pimentel, Caio R., Pina-Amargós, Fabián, Pinheiro, Hudson T., Ponzo, Alessandro, Prasetyo, Andhika, Quamar, L.M.S., Quinlan, Jessica R., Reis-Filho, José Amorim, Ruiz, Hector, Ruiz-Abierno, Alexei, Sala, Enric, Salinas-de-León, Pelayo, Samoilys, Melita A., Sample, William R., Schärer-Umpierre, Michelle, Schlaff, Audrey M., Schmid, Kurt, Schoen, Sara N., Simpson, Nikola, Smith, Adam N.H., Spaet, Julia L.Y., Sparks, Lauren, Stoffers, Twan, Tanna, Akshay, Torres, Rubén, Travers, Michael J., van Zinnicq Bergmann, Maurits, Vigliola, Laurent, Ward, Juney, Warren, Joseph D., Watts, Alexandra M., Wen, Colin K., Whitman, Elizabeth R., Wirsing, Aaron J., Wothke, Aljoscha, Zarza-González, Esteban, and Chapman, Demian D.

Abstract

A global survey of coral reefs reveals that overfishing is driving resident shark species toward extinction, causing diversity deficits in reef elasmobranch (shark and ray) assemblages. Our species-level analysis revealed global declines of 60 to 73% for five common resident reef shark species and that individual shark species were not detected at 34 to 47% of surveyed reefs. As reefs become more shark-depleted, rays begin to dominate assemblages. Shark-dominated assemblages persist in wealthy nations with strong governance and in highly protected areas, whereas poverty, weak governance, and a lack of shark management are associated with depauperate assemblages mainly composed of rays. Without action to address these diversity deficits, loss of ecological function and ecosystem services will increasingly affect human communities.

Published
2023

8. Code for climate analyses in 'Climate-assisted persistence of tropical fish vagrants in temperate marine ecosystems'

Author

Gajdzik, Laura and DeCarlo, Thomas

Abstract

This script performs the climate model analysis for the paper "Climate-assisted persistence of tropical fish vagrants in temperatemarine ecosystems" by Gajdzik et al. (2021). This part of the analysis was performed by T. DeCarlo (tdecarlo@hpu.edu).Briefly, this script uses climate model output to quantify the expectedsea surface temperature changes that will occur this century in WesternAustralia, and uses these changes to predict the future distribution ofinvasive rabbitfish.

Published
2021
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13. Comparison of isotopic turnover dynamics in two different muscles of a coral reef fish during the settlement phase

Author

Gajdzik, Laura, Lepoint, Gilles, Lecchini, David, Frédérich, Bruno, and This study was supported by grants from ANR (ANR-06-JCJC 0012-01) and the CRISP programme (Coral Reef Initiative in the South Pacific- C2A)

Subjects
Acanthuridae, stable isotopes, development, ontogeny, metamorphosis, starvation, surgeonfish, isótopos estables, desarrollo, ontogenia, metamorfosis, inanición
Abstract

The temporal variation in carbon and nitrogen isotopic compositions (noted as δ13C and δ15N) was investigated in the convict surgeonfish (Acanthurus triostegus) at Moorea (French Polynesia). Over a period of 24 days, juveniles were reared in aquaria and subjected to two different feeding treatments: granules or algae. The dynamics of δ13C and δ15N in two muscles (the adductor mandibulae complex and the epaxial musculature) having different functions were compared. At the end of experiments, a steady-state isotopic system in each muscle tissue was not reached. Especially for the algal treatment, we found different patterns of variation in isotopic compositions over time between the two muscles. The turnovers of δ13C showed opposite trends for each muscle but differences are mitigated by starvation and by the metamorphosis. Our study highlighted that the metabolism of coral reef fish may be subjected to catabolism or anabolism of non-protein precursors at settlement, inducing variation in isotopic compositions that are not linked to diet change., La variación temporal en la composiciones isotópicas del carbono y nitrógeno (δ13C y δ15N) fue investigada en el pez cirujano Acanthurus triostegus en Moorea (Polinesia Francesa). Durante un período de 24 días, peces juveniles se mantuvieron en acuarios y se sometieron a dos tratamientos de alimentación: gránulos o algas. Se compararon las dinámicas de cambio δ13C y δ15N en dos músculos con diferentes funciones (complejo aductor mandibular y musculatura epiaxial). Al final de los experimentos, no se alcanzó un sistema isotópico de estado estacionario en ningún tejido. Especialmente para el tratamiento de algas, encontramos distintos patrones de variación en composiciones isotópicas en el tiempo entre los dos músculos. Las variaciones en δ13C mostraron tendencias opuestas para cada músculo, pero las diferencias fueron mitigadas por la inanición y la metamorfosis. Nuestro estudio destaca que el metabolismo de los peces de arrecife puede ser sometido a catabolismo o anabolismo por los precursores no proteicos durante el asentamiento, induciendo variación en las composiciones isotópicas que no están vinculados al cambio de dieta.

Published
2015
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