Jonzén, N., Ranta, E., Lundberg, P., Kaitala,V. & Lindén, H. 2003: Harvestinginduces population fluctuations? - Wildl. Biol. 9: 59-65.
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.
Key words: grouse, harvesting, stochastic populations dynamics, time-series analysis
Niclas Jonzén* & Veijo Kaitala**, Department of Biological and Environmental Science, University of Jyväskylä, P. O. Box 35, FIN-40351, Jyväskylä, Finland - e-mail addresses: niclas.jonzen@teorekol.lu.se (Niclas Jonzén); veijo.kaitala@cc.jyvaskyla.fi (Veijo Kaitala)
Esa Ranta, Department of Ecology and Systematics, University of Helsinki, P. O. Box 65 (Viikinkaari 1), FIN-00014, Helsinki, Finland - e-mail: esa.ranta@helsinki.fi
Per Lundberg, Department of Theoretical Ecology, Ecology Building, Lund University, SE-223 62 Lund, Sweden - e-mail: per.lundberg@teorekol.lu.se
Harto Lindén, Finnish Game and Fisheries Research Institute, P. O. Box 6, FIN-00721, Helsinki, Finland - e-mail: harto.linden@rktl.fi
Present addresses:
*Department of Theoretical Ecology, Ecology Building, Lund University, SE-223 62 Lund, Sweden
**Department of Ecology and Systematics, University of Helsinki, P. O. Box 65 (Viikinkaari 1), FIN-00014, Helsinki, Finland
Corresponding author: Esa Ranta
Received 13 March 2001, accepted 17 June 2002
Associate Editor: Bernt-Erik Sæther