Abstract
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 m2) 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.
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Acknowledgments
We are grateful to Y. Yanagisawa, D. Price and anonymous reviewers for their valuable advice regarding the manuscript. M. Migita and Y. Mizukami gave us technical advice on computer programming. F. Iwasaki provided valuable information on references. This work was supported in part by a grant-in aid for Science Research from the Japan Ministry of Education, Science, Culture, and Sports (Nos. 20570020, 16570014). A. H. is a Guest Scientist at the Center for Ecological Research, Kyoto University.
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Hattori, A., Shibuno, T. The effect of patch reef size on fish species richness in a shallow coral reef shore zone where territorial herbivores are abundant. Ecol Res 25, 457–468 (2010). https://doi.org/10.1007/s11284-009-0675-5
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DOI: https://doi.org/10.1007/s11284-009-0675-5