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| Formato: | Artículo científico |
| Lenguaje: | en |
| Publicado: |
Global change biology
2025
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| Materias: | |
| Acceso en línea: | https://pubmed.ncbi.nlm.nih.gov/40831447/ |
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| _version_ | 1868266162740002818 |
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| author | Brijs, Jeroen Tran, Leon L Moore, Chloe Souza, Taylor Schakmann, Mathias Grellman, Katherine Johansen, Jacob L |
| author_facet | Brijs, Jeroen Tran, Leon L Moore, Chloe Souza, Taylor Schakmann, Mathias Grellman, Katherine Johansen, Jacob L Brijs, Jeroen Tran, Leon L Moore, Chloe Souza, Taylor Schakmann, Mathias Grellman, Katherine Johansen, Jacob L |
| collection | PubMed - marine biology |
| contents | Outlasting the Heat: Collapse of Herbivorous Fish Control of Invasive Algae During Marine Heatwaves. Brijs, Jeroen Tran, Leon L Moore, Chloe Souza, Taylor Schakmann, Mathias Grellman, Katherine Johansen, Jacob L Animals Introduced Species Coral Reefs Herbivory Hot Temperature Fishes Caulerpa Perciformes Marine heatwaves (MHWs), coral bleaching, and chronic local stressors such as eutrophication are accelerating regime shifts from coral- to algae-dominated reefs, increasingly favoring the proliferation of invasive, fast-growing, and often more grazing-resistant turf and macroalgae. A central tenet of global reef management strategies is that herbivorous fishes can sustain critical top-down control of algal proliferation as oceans warm. Here, we challenge this tenet by experimentally evaluating, under controlled laboratory conditions, whether herbivorous coral reef fishes across three key functional groups-browser (Naso lituratus), grazer (Acanthurus triostegus), and scraper (Chlorurus spilurus)-can maintain effective algal control across present-day (24.0°C-27.5°C) temperatures and into projected MHWs (31°C). We assessed (1) whether individuals evacuated thermally stressed conditions, effectively abandoning algal control, and (2) for those that remained, whether they could meet elevated energetic demands by foraging ad libitum on a mixture of Caulerpa spp.-a rapidly spreading and archetypal group of invasive algae in the Indo-Pacific. All species gained body mass while foraging exclusively on these algae during winter and summer (~0.18%-0.62% per day). However, despite remaining in thermally stressed conditions and maintaining stable foraging rates, all species experienced consistent body mass declines (~0.41%-1.62% per day) under MHW exposure. This precipitous decline in body mass was driven by ~54%-60% increases in basal energetic demands without corresponding increases in food intake. Survival estimates based on body mass loss ranged from ~20-81 days, which is substantially shorter than the projected ~126-152-day average duration of future MHWs. Our findings reveal that while short-term algal control may persist during thermal stress, prolonged exposure appears to erode herbivore physiological condition, effectively undermining top-down control of some algal types. Consequently, as ocean warming intensifies, herbivore protection strategies may become increasingly less effective at staving off algae proliferation and dominance in threatened reef ecosystems. |
| format | Artículo científico |
| id | pubmed_40831447 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | Global change biology |
| record_format | pubmed |
| spellingShingle | Outlasting the Heat: Collapse of Herbivorous Fish Control of Invasive Algae During Marine Heatwaves. Brijs, Jeroen Tran, Leon L Moore, Chloe Souza, Taylor Schakmann, Mathias Grellman, Katherine Johansen, Jacob L Animals Introduced Species Coral Reefs Herbivory Hot Temperature Fishes Caulerpa Perciformes Outlasting the Heat: Collapse of Herbivorous Fish Control of Invasive Algae During Marine Heatwaves. Brijs, Jeroen Tran, Leon L Moore, Chloe Souza, Taylor Schakmann, Mathias Grellman, Katherine Johansen, Jacob L Animals Introduced Species Coral Reefs Herbivory Hot Temperature Fishes Caulerpa Perciformes Marine heatwaves (MHWs), coral bleaching, and chronic local stressors such as eutrophication are accelerating regime shifts from coral- to algae-dominated reefs, increasingly favoring the proliferation of invasive, fast-growing, and often more grazing-resistant turf and macroalgae. A central tenet of global reef management strategies is that herbivorous fishes can sustain critical top-down control of algal proliferation as oceans warm. Here, we challenge this tenet by experimentally evaluating, under controlled laboratory conditions, whether herbivorous coral reef fishes across three key functional groups-browser (Naso lituratus), grazer (Acanthurus triostegus), and scraper (Chlorurus spilurus)-can maintain effective algal control across present-day (24.0°C-27.5°C) temperatures and into projected MHWs (31°C). We assessed (1) whether individuals evacuated thermally stressed conditions, effectively abandoning algal control, and (2) for those that remained, whether they could meet elevated energetic demands by foraging ad libitum on a mixture of Caulerpa spp.-a rapidly spreading and archetypal group of invasive algae in the Indo-Pacific. All species gained body mass while foraging exclusively on these algae during winter and summer (~0.18%-0.62% per day). However, despite remaining in thermally stressed conditions and maintaining stable foraging rates, all species experienced consistent body mass declines (~0.41%-1.62% per day) under MHW exposure. This precipitous decline in body mass was driven by ~54%-60% increases in basal energetic demands without corresponding increases in food intake. Survival estimates based on body mass loss ranged from ~20-81 days, which is substantially shorter than the projected ~126-152-day average duration of future MHWs. Our findings reveal that while short-term algal control may persist during thermal stress, prolonged exposure appears to erode herbivore physiological condition, effectively undermining top-down control of some algal types. Consequently, as ocean warming intensifies, herbivore protection strategies may become increasingly less effective at staving off algae proliferation and dominance in threatened reef ecosystems. |
| title | Outlasting the Heat: Collapse of Herbivorous Fish Control of Invasive Algae During Marine Heatwaves. |
| topic | Animals Introduced Species Coral Reefs Herbivory Hot Temperature Fishes Caulerpa Perciformes |
| url | https://pubmed.ncbi.nlm.nih.gov/40831447/ |