Harvesting-induced population fluctuations?
Författare
Summary, in English
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.
Publiceringsår
2003
Språk
Engelska
Sidor
59-65
Publikation/Tidskrift/Serie
Wildlife Biology
Volym
9
Issue
1
Dokumenttyp
Artikel i tidskrift
Förlag
Nordic Council of Wildlife Research
Ämne
- Biological Sciences
Status
Published
Forskningsgrupp
- Theoretical Population Ecology and Evolution Group
ISBN/ISSN/Övrigt
- ISSN: 0909-6396