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Invasion of an intermediate predator: Fish population dynamics in a mathematical model of a trophic chain (As applied to Syamozero lake) |
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| Authors: | M M Gonik A E Bobyrev V A Burmensky E A Kriksunov B -L Li H Malchow A B Medvinsky O P Sterligova |
| Institution: | (1) Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia;(2) Department of Botany and Plant Sciences, University of California, Riverside, CA, Russia;(3) Severtsov Institute of Ecological and Evolutionary Problems, Russian Academy of Sciences, Moscow, Russia;(4) Biological Faculty, Moscow State University, Moscow, 119992, Russia;(5) Institute of Environmental Systems Research, University of Osnabrueck, Osnabrueck, 49069, Germany;(6) Institute of Biology, Karelian Scientific Center, Russian Academy of Sciences, Petrozavodsk, Russia |
| Abstract: | A mathematical model is presented for the dynamics of a spatially heterogeneous predator-prey population system; a prototype is the Syamozero lake fish community. We show that the invasion of an intermediate predator can evoke chaotic oscillations in the population densities. We also show that different dynamic regimes (stationary, nonchaotic oscillatory, and chaotic) can coexist. The “choice” of a particular regime depends on the initial invader density. Analysis of the model solutions shows that invasion of an alien species is successful only in the absence of competition between the juvenile invaders and the native species. |
| Keywords: | population dynamics invasion coexistence of dynamic regimes |
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