Within-reef differences in diet and body condition of coral-feeding butterflyfishes (Chaetodontidae)
Within-reef differences in diet and body condition of coral-feeding butterflyfishes (Chaetodontidae)
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DOI：
10.3354/meps287217
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
McCormick, MI
中科院分区：
文献类型：
--
作者：
Berumen, ML;Pratchett, MS;McCormick, MI
由于幼虫供应的高度随机性，珊瑚礁鱼类往往定居在次优栖息地，猎物或其他资源有限。在不同的珊瑚礁栖息地之间的资源的可用性和质量的变化很可能有显着的影响的生理条件和随后的健身的居民鱼类，如果不是他们的绝对丰度。本文比较了两种珊瑚食性蝴蝶鱼（Chaetodon baronessa和C. lunulatus）在对比鲜明的栖息地有显着不同的猎物可用性。尽管猎物可获得性存在差异，但C. baronessa和C.不同地点的新月肌非常相似。然而，它们的摄食和生理状况存在显著的空间差异。在前礁位置，那里的珊瑚猎物是非常丰富的，C。baronessa优先喂养，几乎完全对珊瑚Acropora hyacinthus。相反，在珊瑚猎物稀少的后礁区，A。hyacinthus lacking，C. baronessa的选择性要小得多，并消耗了更广泛的珊瑚猎物。C. lunulatus的选择性低于C. baronessa，但C. lunulatus也有显着不同的栖息地。C. lunulatus主要以A.风信子在前礁的位置，但不是在更大的比例比它是可用的。在后礁区，C. lunulatus优先取食A. intermedia和Porites spp.研究了两种C. baronessa和C. lunulatus是更糟糕的是在后礁的位置相比，前礁的位置，这可能反映了在不同的栖息地的猎物的数量和/或质量的差异。这项研究表明，小规模的（内礁）猎物的可用性差异可以有显着的生理条件和随后的健身珊瑚礁鱼类的影响。
Given the highly stochastic nature of larval supply, coral reef fishes often settle in suboptimal habitats with limited access to prey or other resources. Variation in the availability and quality of resources among different reef habitats is likely to have significant effects on the physiological condition and subsequent fitness of resident fishes, if not their absolute abundance. This study compared the abundance, feeding and condition of 2 species of coral-feeding butterflyfishes (Chaetodon baronessa and C. lunulatus) across contrasting habitats with markedly different prey availability. Despite differences in prey availability, densities of C. baronessa and C. lunulatus were very similar between locations. However, there was significant spatial variation in their feeding and physiological condition. In front-reef locations, where coral prey was highly abundant, C. baronessa fed preferentially and almost exclusively on the coral Acropora hyacinthus. In contrast, in back-reef locations where coral prey was scarce and A. hyacinthus lacking, C. baronessa was much less selective and consumed a wider range of coral prey. C. lunulatus was less selective than C. baronessa, but the diet of C. lunulatus also differed significantly between habitats. C. lunulatus consumed mostly A. hyacinthus in front-reef locations but not in greater proportions than it was available. In back-reef locations, C. lunulatus preferentially consumed A. intermedia and Porites spp. The physiological condition of both C. baronessa and C. lunulatus was much worse in back-reef locations compared to front-reef locations, which may reflect differences in the quantity and/or quality of prey available in different habitats. This study suggests that small-scale (within-reef) differences in prey availability can have significant effects on the physiological condition and subsequent fitness of coral reef fishes.