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Linking resource matching and dispersal

Palmqvist, Eva LU ; Lundberg, Per LU and Jonzén, Niclas LU (2000) In Evolutionary Ecology 14(1). p.1-12
Abstract
We study theoretically the effect of inter-habitat migration on the distribution of population sizes between two habitats, and compare this distribution with the expected ideal free distribution (IFD). Whenever emigration from the two habitats is asymmetric, or when there is a survival cost during migration, the resulting equilibrium distribution of population sizes deviates from the IFD. This result holds irrespective of emigration rule, even though a density-dependent fraction of emigrants generally produces a distribution closer to the IFD than a constant fraction of emigrants. Environmental stochasticity causes a linear relation between population sizes in the two habitats, with slope and intercept only identical to the IFD when net... (More)
We study theoretically the effect of inter-habitat migration on the distribution of population sizes between two habitats, and compare this distribution with the expected ideal free distribution (IFD). Whenever emigration from the two habitats is asymmetric, or when there is a survival cost during migration, the resulting equilibrium distribution of population sizes deviates from the IFD. This result holds irrespective of emigration rule, even though a density-dependent fraction of emigrants generally produces a distribution closer to the IFD than a constant fraction of emigrants. Environmental stochasticity causes a linear relation between population sizes in the two habitats, with slope and intercept only identical to the IFD when net inter-habitat exchange is zero. The type and asymmetry of inter-habitat migration will influence how we should interpret data on population distribution in different habitats. The resulting resource matching is also critically contingent on the relative time-scales of population renewal and dispersal, and when population size is measured in relation to reproduction and dispersal. Therefore, data on population sizes cannot be used uncritically to assess habitat quality. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Evolutionary Ecology
volume
14
issue
1
pages
1 - 12
publisher
Springer
external identifiers
  • scopus:0034447512
ISSN
1573-8477
DOI
10.1023/A:1011092401084
language
English
LU publication?
yes
id
eebb7fde-8241-4d24-82e7-456995aae625 (old id 147582)
date added to LUP
2007-07-03 15:01:22
date last changed
2017-01-01 04:29:49
@article{eebb7fde-8241-4d24-82e7-456995aae625,
  abstract     = {We study theoretically the effect of inter-habitat migration on the distribution of population sizes between two habitats, and compare this distribution with the expected ideal free distribution (IFD). Whenever emigration from the two habitats is asymmetric, or when there is a survival cost during migration, the resulting equilibrium distribution of population sizes deviates from the IFD. This result holds irrespective of emigration rule, even though a density-dependent fraction of emigrants generally produces a distribution closer to the IFD than a constant fraction of emigrants. Environmental stochasticity causes a linear relation between population sizes in the two habitats, with slope and intercept only identical to the IFD when net inter-habitat exchange is zero. The type and asymmetry of inter-habitat migration will influence how we should interpret data on population distribution in different habitats. The resulting resource matching is also critically contingent on the relative time-scales of population renewal and dispersal, and when population size is measured in relation to reproduction and dispersal. Therefore, data on population sizes cannot be used uncritically to assess habitat quality.},
  author       = {Palmqvist, Eva and Lundberg, Per and Jonzén, Niclas},
  issn         = {1573-8477},
  language     = {eng},
  number       = {1},
  pages        = {1--12},
  publisher    = {Springer},
  series       = {Evolutionary Ecology},
  title        = {Linking resource matching and dispersal},
  url          = {http://dx.doi.org/10.1023/A:1011092401084},
  volume       = {14},
  year         = {2000},
}