On the coexistence of three predatory stonefly species in a central Japanese stream
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Three large-bodied stonefly species (Paragnetina tinctipennis, Oyamia lugubris, and Kamimuria tibialis) coexist in a central Japanese stream. These species have been classified as predators. Here we study their microhabitat use while focusing on the physical environments, physiological activity, and food resources. We show that Paragnetina uses a niche with faster currents than other species throughout the year. Oyamia has seasonal flexibility in microhabitat preference, physiological activity, and food resources. Kamimuria is a rather stable species, independent of seasonal patterns.
KeywordsCoexistence Current Diet Predators Stonefly
We thank H. Mitsuhashi, K. Nozaki, and Y. Kohmatsu for their assistance in field surveys and species identification. We also thank Jeremy Monroe for comments on the manuscript. This research was partly supported by the Foundation of River and Watershed Environmental Management of Japan, and the Japan Society for the Promotion of Science.
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