Abstract
In order to clarify the mechanisms determining fish distribution patterns in a mangrove system on Iriomote Island, in southern Japan, fish assemblage structures were determined by visual observation, along with food abundance and environmental factors, in an area of mangrove roots on the banks, and a bare sand area at the center, within downstream, midstream and upstream portions of a branch creek from the Urauchi River. The fish assemblage structures differed significantly between the area types, with the mangrove-root area supporting a more diverse and abundant fish fauna. A canonical correspondence analysis revealed that the relationships between fish distribution and their food abundance differed among trophic groups. Benthic crustacean or plant feeders were positively associated with their prey i.e. crabs and macroalgae—in other words, these trophic groups were abundant in downstream and/or midstream mangrove-root areas in which their prey were also particularly abundant. However, zooplankton feeders did not show such relationships, their abundance being positively associated with fine sediment particles (characteristic of areas with weak water movement). These results suggested that food availability is a major factor determining the distribution patterns of benthic crustacean feeders and plant feeders, whereas for zooplankton feeders other factors, such as sheltering effects against water current and/or predators, may be more significant.
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Acknowledgments
We are grateful to Ken Sakihara, Akira Mizutani and the Okinawa Regional Research Center, Tokai University, for assistance with the fieldwork. Constructive comments on the manuscript from Graham Hardy and two anonymous reviewers were much appreciated. This study was funded by a Grant-in-Aid for Scientific Research (B) from the Japan Society for the Promotion of Science (No. 21380121).
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Nanjo, K., Kohno, H., Nakamura, Y. et al. Differences in fish assemblage structure between vegetated and unvegetated microhabitats in relation to food abundance patterns in a mangrove creek. Fish Sci 80, 21–41 (2014). https://doi.org/10.1007/s12562-013-0682-x
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DOI: https://doi.org/10.1007/s12562-013-0682-x