The influence of natural cycles on coral reef fish movement: implications for underwater visual census (UVC) surveys |
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Authors: | J P Bijoux L Dagorn J-C Gaertner P D Cowley J Robinson |
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Institution: | 1. UMR 212 EME, Institut de Recherche pour le Développement, Victoria, Mahé, Seychelles 2. UMR 241 EIO, Institut de Recherche pour le Développement, Papeete, Polynésie fran?aise 5. South African Institute for Aquatic Biodiversity, Private Bag 1015, Grahamstown, South Africa 3. Seychelles Fishing Authority, P.O. Box 449, Victoria, Seychelles 4. ARC Centre of Excellence for Coral Reef Studies, Townsville, Australia
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Abstract: | Movement patterns of some coral reef fishes change with natural cycles (e.g., tidal, lunar and seasonal), resulting in short-term shifts in fish assemblages. We reviewed the literature on temporal changes in coral reef fish assemblages derived from underwater visual census (UVC) and found that movement was rarely considered in experimental design and analysis or as cause of change in interpretation of the results. Studies of vagile species, large individuals, species forming transient spawning aggregations and studies of fishes in contiguous habitats are most likely to be affected by such movements. Ignoring predictable patterns of movement associated with such natural cycles in survey design and analysis increases “unexplained” variation, making it more difficult to detect longer-term changes in fish assemblages and reducing the effectiveness of UVC as a monitoring tool. |
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