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<p>Antipatharians thrive in environments with unusual conditions for reefs, such as strong currents, low luminosity, and variable turbidity. The latter can be influenced by both anthropogenic activities like deforestation and mining, as well as natural events such as hurricanes, leading to increased particle release into coastal waters. These changes may adversely affect antipatharian ecosystems. This study investigates the impact of suspended particles on the respiration rates of antipatharian species of the northern pass of the Great Reef of Toliara, near the Fiherenana River mouth in SW Madagascar. Four species with three morphotypes (branched, bottle-brush, and whip) were collected. In the laboratory, nubbins from each species were exposed to five extreme concentrations of suspended particles ranging from 4.5 to 18&#xa0;g/L over three-hour cycles for two consecutive days, simulating tidal conditions specific to the reef. Respiration rates were monitored as indicators of metabolic stress. Three species showed increased metabolic rates under particle exposure, while the fourth remained unaffected. After particle removal, the three responding species returned to standard respiration rate. Morphology appeared to influence particle accumulation and stress responses. Bottle-brush species likely trapped more particles between branches, while whip species showed contrasting strategies: one cleared particles rapidly at a metabolic cost, and the other tolerated accumulation for limited durations. This study provides the first assessment of shallow-water antipatharians' resistance to extreme particle exposure, suggesting they may be key components of the "marginal" reef ecosystems.</p>

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Metabolic response of shallow-water black corals (Antipatharia) facing extreme particle concentrations during short-term exposure

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Alexia Dimopoulos,
  • Philippe Dubois,
  • Gildas G. B. Todinanahary,
  • Lucas Terrana

摘要

Antipatharians thrive in environments with unusual conditions for reefs, such as strong currents, low luminosity, and variable turbidity. The latter can be influenced by both anthropogenic activities like deforestation and mining, as well as natural events such as hurricanes, leading to increased particle release into coastal waters. These changes may adversely affect antipatharian ecosystems. This study investigates the impact of suspended particles on the respiration rates of antipatharian species of the northern pass of the Great Reef of Toliara, near the Fiherenana River mouth in SW Madagascar. Four species with three morphotypes (branched, bottle-brush, and whip) were collected. In the laboratory, nubbins from each species were exposed to five extreme concentrations of suspended particles ranging from 4.5 to 18 g/L over three-hour cycles for two consecutive days, simulating tidal conditions specific to the reef. Respiration rates were monitored as indicators of metabolic stress. Three species showed increased metabolic rates under particle exposure, while the fourth remained unaffected. After particle removal, the three responding species returned to standard respiration rate. Morphology appeared to influence particle accumulation and stress responses. Bottle-brush species likely trapped more particles between branches, while whip species showed contrasting strategies: one cleared particles rapidly at a metabolic cost, and the other tolerated accumulation for limited durations. This study provides the first assessment of shallow-water antipatharians' resistance to extreme particle exposure, suggesting they may be key components of the "marginal" reef ecosystems.