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首页> 外文期刊>Ecological research >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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The effect of patch reef size on fish species richness in a shallow coral reef shore zone where territorial herbivores are abundant

机译：陆地草食动物丰富的浅珊瑚礁海岸带的斑块礁尺寸对鱼类物种丰富度的影响

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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 (Poma-centridae) 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, Shi-raho 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.
机译：小斑块礁可以容纳许多礁鱼，因为大多数鱼的幼体阶段是漂移的，可以随机散布在斑驳的栖息地上。我们使用高分辨率彩色航拍照片的放大部分作为场图，研究了84个小斑礁（0.05-45.4 m〜2）上的雀鲷（Poma-centridae）组合的物种-面积关系（SAR）。 2500）位于浅石珊瑚礁海岸带（日本石垣岛狮拉霍珊瑚礁深<2 m，3.6公顷）。这项研究证实，在这种规模的情况下，对数函数优于其他函数（包括幂函数）来解释SAR。整个研究地点的实际物种丰富度（24）远高于从半对数空间中的回归线推断出的物种丰富度（15.4）。使用随机放置模型和计算机模拟可以获得更好的估计。这些结果表明，几个小块礁可能比研究地点的单个大块礁具有相同的面积。四个最丰富的区域草食动物的个体总数几乎随斑块面积线性增加，而其他物种的总数随该面积的平方根大致增加。虽然在最小的珊瑚礁中没有发现任何物种，但是大型的食草动物，半裸斜纹齿top，丰富而对大珊瑚礁的物种丰富度具有负面影响。尽管众所周知的单颗或几颗小（SLOSS）辩论已基本解决，但这种二分法在领土草食动物没有占据最小礁石的地方可能很重要。

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