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Model analysis of the effect of environmental fluctuation on the species replacement pattern of pelagic fishes under interspecific competition
Authors:Hiroyuki Matsuda  Tokio Wada  Yasuhiro Takeuchi  Yoshiharu Matsumiya
Affiliation:1. National Research Institute of Fisheries Science, 5-5-1 Kachidoki, Chuo-ku, 104, Tokyo, Japan
2. Hokkaido National Fisheries Research Institute, Katsurakoi, 085, Kushiro, Japan
3. Faculty of Engineering, Shizuoka University, Jouhoku, 432, Hamamatsu, Japan
4. Faculty of Bioresourse, Mie University, 514, Tsu, Japan
Abstract:There are two factors affecting long-term fluctuation of planktotrophic pelagic fish: environmental fluctuation and interspecific competition. Long-term catch data of planktotrophic pelagic fishes in Japan suggest that the chub mackerel (species B) was replaced by the sardine (A), A was replaced by the anchovy, Pacific saury and horse mackerel (Group C), and species in group C were replaced by species B. If species A defeats B, B defeats C, and C defeats A in interspecific competitive ability, then the abundance of these three groups fluctuate forever and dominate in the same order. We call this cyclic advantage hypothesis for species replacement. In this model, environmental fluctuation affects the species replacement as a trigger. Environmental fluctuation does not determine the next dominant species but greatly affects when the next replacement occurs.
Keywords:pelagic fishes  species replacement  cyclic advantage relationships  long-term stock fluctuation
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