THE HYDRA EFFECT IN THE DYNAMIC MODEL OF AGE- AND SEX- STRUCTURED EXPLOITED POPULATION

O.L. Revutskaya

Аннотация


On the discrete-time model basis we study the influence of selective harvest on the dynamics of a population with age and sex structures. We consider three harvest strategies, when some part of a younger age class, or mature males, or mature females are removed. We show that the exploited sex and age-specific group equilibrium size (after reproduction) can increase with the increase of harvested individuals proportion; that is, the hydra effect is observed.


Ключевые слова


discrete-time model; age and sex structure; density-dependent regulation; harvest; stability; hydra effect.

Литература


Revutskaya O.L., Neverova G.P., Frisman E.Ya. Influence of harvest on the dynamics of populations with age and sex structures. Matematicheskaya biologiya i bioinformatika, 2018, vol. 13 (1), pp. 270–289. (In Russ.).

Hilker F.M., Liz E. Harvesting, census timing and «hidden» hydra effects. Ecological Complexity, 2013, vol. 14, pp. 95–107.


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