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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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5. 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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7. Widespread diversity deficits of coral reef sharks and rays

Author

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

Published
2023
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8. 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

12. 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. Translational Molecular Ecology in practice: Linking DNA-based methods to actionable marine environmental management

Author

Aylagas, Eva, Borja, Angel, Pochon, Xavier, Zaiko, Anastasija, Keeley, Nigel, Bruce, Kat, Hong, Peiying, Ruiz, Gregory M., Stein, Eric D., Theroux, Susanna, Geraldi, Nathan, Ortega, Alejandra, Gajdzik, Laura, Coker, Darren J., Katan, Yasser, Hikmawan, Tyas, Saleem, Ammar, Alamer, Sultan, Jones, Burton H., Duarte, Carlos M., Pearman, John, and Carvalho, Susana

Published
2020
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23. 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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26. Don't judge a fish by its fins: species delineation of Congolese Labeo (Cyprinidae).

Author

Van Steenberge, Maarten, Gajdzik, Laura, Chilala, Alex, Snoeks, Jos, and Vreven, Emmanuel

Subjects
*LABEO, *ALLOMETRY, *CYPRINIDAE, *FINS (Anatomy), *FISHES
Abstract

Conspicuous characters are often useful in species identification. Yet, identification and delineation are two different processes, and such characters do not necessarily provide the best basis on which species can be delineated. This is illustrated by the case of the Labeo with papillary lips from the Congo basin. Traditionally, species delineation in this group was based on a conspicuous trait: the shape of the dorsal fin, which shows a profound degree of differentiation. Morphometric analyses were performed on 185 specimens both with and without measurements taken on this fin. The groups obtained using these two approaches were compared with those obtained through DNA barcoding. For this, 24 sequences of the standard barcoding COI gene were obtained. Species delineations based on morphological and molecular results were in agreement when the shape of the dorsal fin was ignored. This suggested that of the five nominal species known from the Congo basin, L. altivelis, L. rosae, L. lineatus, L. weeksii and L. maleboensis, only the former three remain valid. Consequently, L. weeksii was synonymised with L. altivelis and L. maleboensis with L. lineatus. The sole Congo basin endemic is L. lineatus as L. altivelis and L. rosae also occur in more southern basins. The use of the shape of the dorsal fin in morphological studies has previously led to overestimates of species diversity in this group. This is due to the fact that L. altivelis shows a remarkable amount of geographical variation for this trait. The large amount of intra- and interspecific variation in this character was caused by differential allometric growth in different parts of the dorsal fin. [ABSTRACT FROM AUTHOR]

Published
2017
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28. Evidence for managing herbivores for reef resilience.

Author

Donovan MK, Counsell CWW, Donahue MJ, Lecky J, Gajdzik L, Marcoux SD, Sparks R, and Teague C

Subjects
Humans, Animals, Conservation of Natural Resources, Coral Reefs, Biomass, Hawaii, Fisheries, Fishes, Herbivory, Anthozoa
Abstract

Herbivore management is an important tool for resilience-based approaches to coral reef conservation, and evidence-based science is needed to enact successful management. We synthesized data from multiple monitoring programs in Hawai'i to measure herbivore biomass and benthic condition over a 10-year period preceding any major coral bleaching. We analysed data from 20 242 transects alongside data on 27 biophysical and human drivers and found herbivore biomass was highly variable throughout Hawai'i, with high values in remote locations and the lowest values near population centres. Both human and biophysical drivers explained variation in herbivore biomass, and among the human drivers both fishing and land-based pollution had negative effects on biomass. We also found evidence that herbivore functional group biomass is strongly linked to benthic condition, and that benthic condition is sensitive to changes in herbivore biomass associated with fishing. We show that when herbivore biomass is below 80% of potential biomass, benthic condition is predicted to decline. We also show that a range of management actions, including area-specific fisheries regulations and gear restrictions, can increase parrotfish biomass. Together, these results provide lines of evidence to support managing herbivores as an effective strategy for maintaining or bolstering reef resilience in a changing climate.

Published
2023
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