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RESEARCH PRODUCT
Harvesting‐induced population fluctuations?
Harto LindénNiclas JonzénVeijo KaitalaEsa RantaPer Lundbergsubject
0106 biological sciences0303 health scienceseducation.field_of_studybiologyEcologyPopulationLinear modelGrouseManagement Monitoring Policy and Lawbiology.organism_classification010603 evolutionary biology01 natural sciences03 medical and health sciencesDensity dependence14. Life underwatereducationConstant (mathematics)Biological sciencesEcology Evolution Behavior and Systematics030304 developmental biologyNature and Landscape Conservationdescription
It has recently been shown that damped endogenous dynamics is a common feature in Finnish grouse species; In this paper, we demonstrate that time-variant harvesting may turn damped dynamics to quasi-periodic fluctuations. Exploited populations, e.g. grouse, may therefore fluctuate more than expected if we do not manage to keep the harvest fraction constant over time. However, the harvest fraction of Finnish grouse varies with the phase of the cycle. Such a harvesting strategy could potentially change the periodicity of the fluctuations, as can a threshold harvest strategy where a constant fraction is harvested above a density threshold. The two non-linear harvesting strategies investigated here can modulate the dynamic properties of the population in a way not predicted by linear models. We argue that the behaviour of exploited populations and the role of harvesting can only be understood if we identify and understand the interplay of endogenous and exogenous components of population dynamics. (Less)
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-03-01 | Wildlife Biology |