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Harvesting-induced population fluctuations?

Jonzén, Niclas LU ; Ranta, E; Lundberg, Per LU ; Kaitala, V and Linden, H (2003) In Wildlife Biology 9(1). p.59-65
Abstract
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... (More)
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)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Wildlife Biology
volume
9
issue
1
pages
59 - 65
publisher
Nordic Council of Wildlife Research
external identifiers
  • wos:000181956600007
  • scopus:0037351935
ISSN
0909-6396
language
English
LU publication?
yes
id
c623dce5-6c9d-4d17-ac40-3fd6824866fd (old id 135484)
date added to LUP
2007-07-03 12:36:47
date last changed
2017-01-01 07:24:31
@article{c623dce5-6c9d-4d17-ac40-3fd6824866fd,
  abstract     = {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.},
  author       = {Jonzén, Niclas and Ranta, E and Lundberg, Per and Kaitala, V and Linden, H},
  issn         = {0909-6396},
  language     = {eng},
  number       = {1},
  pages        = {59--65},
  publisher    = {Nordic Council of Wildlife Research},
  series       = {Wildlife Biology},
  title        = {Harvesting-induced population fluctuations?},
  volume       = {9},
  year         = {2003},
}