Geodesic
Dynamics unstability in the mathematical model of salmon's populations number dynamics
Dalʹnevostočnyj matematičeskij žurnal, Tome 2 (2001) no. 1, pp. 114-125.

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Far East salmons are classical example of non-uniform populations. A discrete mathematical model of such populations number dynamics is suggested and investigated. Most particular cases are described in detail. The general algorithm for determine “bifurcation points” is worked out. The basic model was investigated by numerical methods for some real Pacific salmon's populations. Was found all possible variants of number changes and character of stability each of its. Was determined parameters which with population dynamics becomes chaotic. 
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E. V. Last; S. P. Luppov; E. Ya. Frisman. Dynamics unstability in the mathematical model of salmon's populations number dynamics. Dalʹnevostočnyj matematičeskij žurnal, Tome 2 (2001) no. 1, pp. 114-125. http://geodesic.mathdoc.fr/item/DVMG_2001_2_1_a10/

[1] S. M. Konovalov, Populyatsionnaya biologiya tikhookeanskikh lososei, Nauka, L., 1980 | Zbl

[2] A. P. Shapiro, S. P. Luppov, Rekurrentnye uravneniya v teorii populyatsionnoi biologii, Nauka, M., 1982 | MR