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Ecological versatility and the decline of coral feeding fishes following climate driven coral mortality

机译：气候变化导致的珊瑚死亡后，生态多样性和以珊瑚为食的鱼类数量下降

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Coral reefs are under threat due to climate-mediated coral mortality, which affects some reef coral genera more severely than others. The impact this has on coral reef fish is receiving increasing attention, with one focal area assessing impacts on fish that feed directly on live coral. It appears that the more specialised a species of corallivore, the more susceptible it is to coral declines. However data are sparse for the Indian Ocean, and little is known about why some corals are preferentially fed upon over others. Here I assess feeding specialisation in three species of coral feeding butterflyfish in the Chagos Archipelago, central Indian Ocean, assess the food quality of the coral genera they target and document patterns of decline in the Seychelles following a severe coral mortality event. Cheatodon trifascialis was the most specialised coral feeder, preferentially selecting for Acropora corals, however, when Acropora was scarce, individuals showed considerable feeding plasticity, particularly for the dominant Pocillopora corals. C. trifasciatus also preferentially fed on Acropora corals, but fed on a much more diverse suite of corals and also displayed some selectivity for Porites. C. auriga is a facultative corallivore and consumed ～55% live coral, which lies within the wide range of coral dependence reported for this species. C:N ratio analysis indicated Lobophyllia and Acropora have the highest food quality, with Pocillopora having the lowest, which conforms with diet selection of corallivores and helps explain preferential feeding. Obligate specialist feeders displayed the greatest declines through coral mortality in the Seychelles with obligate generalists also declining substantially, but facultative feeders showing little change. Clearly a greater understanding of the species most vulnerable to disturbance, their habitat requirements and the functional roles they play will greatly assist biodiversity conservation in a changing climate.
机译：由于气候介导的珊瑚死亡，珊瑚礁受到威胁，与其他珊瑚礁相比，珊瑚礁对珊瑚礁属的影响更为严重。这对珊瑚礁鱼类的影响越来越受到关注，其中一个重点领域是评估对直接以活珊瑚为食的鱼类的影响。似乎珊瑚虫种类越特殊，它对珊瑚衰退的敏感性就越高。然而，印度洋的数据稀少，对于为什么某些珊瑚比其他一些珊瑚更受优先喂养的原因知之甚少。在这里，我评估了印度洋中部查戈斯群岛三种珊瑚饲喂蝴蝶鱼的捕食专长，评估了它们针对的珊瑚属的食物质量，并记录了塞舌尔群岛因严重珊瑚死亡事件而下降的模式。 Cheatodon trifascialis是最专业的珊瑚饲养者，优先选择Acropora珊瑚，但是，当Acropora稀缺时，个体会表现出可观的可食性，尤其是占主导地位的Pocillopora珊瑚。 C. trifasciatus还优先以Acropora珊瑚为食，但以多种多样的珊瑚为食，对Porite也表现出一定的选择性。 C. auriga是一种兼性珊瑚，消耗了约55％的活珊瑚，这在该物种对珊瑚的广泛依赖范围内。 C：N比分析表明，叶肉和刺耳的食物质量最高，而Pocillopora的食物质量最低，这与珊瑚虫的饮食选择相符，并有助于解释优先进食。专职的饲养者在塞舌尔的珊瑚死亡率下降幅度最大，专职的饲养者也大幅下降，但兼职的饲养者变化不大。显然，对最容易受到干扰的物种，其生境要求及其所发挥的功能作用的更多了解，将大大有助于在气候变化中保护生物多样性。

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  • 来源
    《Marine biology》 |2007年第2期|p.119-127|共9页
  • 作者

    Nicholas A. J. Graham;

  • 作者单位

    School of Marine Science and Technology, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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