The effect of patch reef size on fish species richness in a shallow coral reef shore zone where territorial herbivores are abundant
The effect of patch reef size on fish species richness in a shallow coral reef shore zone where territorial herbivores are abundant
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DOI：
10.1007/s11284-009-0675-5
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发表时间：
2010-03-01
影响因子：
2
通讯作者：
Shibuno, Takuro
中科院分区：
文献类型：
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作者：
Hattori, Akihisa;Shibuno, Takuro
小块珊瑚礁可以容纳许多珊瑚礁鱼类，因为大多数鱼类都有一个漂流的幼虫阶段，随机分散在斑块状的栖息地上。在日本石垣岛白鹤礁（Shiraho reef, Ishigaki Island）浅层珊瑚礁岸带（深度< 2 m，面积3.6 ha），利用高分辨率彩色航空照片的放大部分作为野外地图（1/2500），研究了84个小块珊瑚礁（0.05-45.4 m(2)）上鲷鱼（Pomacentridae）群落的种区关系（SAR）。本研究证实对数函数比其他函数（包括幂函数）更能解释该量表的SAR。整个研究点的实际物种丰富度（24）远高于半对数空间回归曲线推断的物种丰富度（15.4）。使用随机放置模型和计算机模拟得到了更好的估计。这些结果表明，在研究地点，几个小的斑块珊瑚礁可能比一个相同面积的大型珊瑚礁具有更高的物种丰富度。四种最丰富的领土食草动物的总个体数几乎随斑块礁面积的增加而线性增加，而其他物种的个体数大致随面积的平方根而增加。虽然在最小的珊瑚礁中没有发现领土物种，但大型领土食草动物Hemiglyphidodon plagiometopon丰富，并对大型珊瑚礁的物种丰富度产生负面影响。虽然众所周知的单一大或几个小（SLOSS）争论已经基本上解决了，但这种二分法在领土食草动物不占据最小珊瑚礁的地方可能很重要。
Small patch reefs can harbor many reef fishes because most fishes have a drifting larval phase to randomly disperse over patchy habitats. We examined the species-area relationship (SAR) of damselfish (Pomacentridae) assemblages over 84 small patch reefs (0.05-45.4 m(2)) using an enlarged section of a high-resolution color aerial photograph as a field map (1/2500) in a shallow coral reef shore zone (< 2 m deep, 3.6 ha, Shiraho Reef, Ishigaki Island, Japan). This study confirmed that the logarithmic function is better than other functions (including the power function) to explain the SAR in this scale. Actual species richness (24) over the entire study site was much higher than the species richness (15.4) extrapolated from the regression line in semi-log space. Better estimates were obtained using random placement models and computer simulations. These results suggest that several small patch reefs are likely to have higher species richness than a single large reef of equivalent area at the study site. The total number of individuals of the four most abundant territorial herbivores increased almost linearly with patch reef area, but that of other species roughly increased with the square root of the area. While no territorial species were found in the smallest reefs, the large territorial herbivore, Hemiglyphidodon plagiometopon, was abundant and had negative effects on species richness in large reefs. Although the well-known single-large-or-several-small (SLOSS) debate has largely been settled, this dichotomy can be important in places where territorial herbivores do not occupy the smallest reefs.