Abstract
We examined fish community structures in floodplain backwaters in the Kiso River, Central Japan, in an uncommon drought year. Nine floodplain backwaters with varying levels of flood inundation frequency were surveyed for winter fish communities, and measured for local environmental variables in summer and winter periods. The winter fish community was better represented, with less diverse and physiologically tolerant species in backwaters with a decreasing flood pulse frequency. The temporal frequency of hypoxic conditions (dissolved oxygen of <2 mg l−1) and chlorophyll a in summer explained the heterogeneity of the fish community along the gradient of inundation frequency, while no variables measured in winter had an explanatory power. These results suggest that drought-induced, infrequent flood pulses in the autumn–winter period limited the dispersal opportunity of fishes, and thus maintained community structures selected by summer limiting factors until the survey took place in winter. Future comparisons of our data with those in non-drought years would provide important implications to the sustainable management of floodplains for wintering fishes against the increasing probability of future flow regime changes.
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Acknowledgments
We are grateful to S. Nagayama and T. Morosawa for fruitful discussions, K. Ikeya for fish sampling, and C. Torii, S. Kohara and N. Suzuki for collecting references. We also gratefully acknowledge the comments of two anonymous reviewers. This study was supported by the Pollution Control Research Fund from the Ministry of the Environment Japan and a Grant-in-Aid for Scientific Research (A) (23248021) provided to JNN.
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Kume, M., Negishi, J.N., Sagawa, S. et al. Winter fish community structures across floodplain backwaters in a drought year. Limnology 15, 109–115 (2014). https://doi.org/10.1007/s10201-013-0421-0
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DOI: https://doi.org/10.1007/s10201-013-0421-0