Journal
JOURNAL OF MATHEMATICAL BIOLOGY
Volume 65, Issue 5, Pages 997-1016Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00285-011-0489-2
Keywords
Discrete population model; Harvesting; Bubbles; Hydra effect; Chaos
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Funding
- Spanish Ministry of Science and Innovation [MTM2008-02502]
- FEDER [MTM2010-14837]
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We analyze the effects of a strategy of constant effort harvesting in the global dynamics of a one-dimensional discrete population model that includes density-independent survivorship of adults and overcompensating density dependence. We discuss the phenomenon of bubbling (which indicates that harvesting can magnify fluctuations in population abundance) and the hydra effect, which means that the stock size gets larger as harvesting rate increases. Moreover, we show that the system displays chaotic behaviour under the combination of high per capita recruitment and small survivorship rates.
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