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The collapse of cycles in the dynamics of North American grouse populations

Williams, C K; Ives, A R; Applegate, R D and Ripa, Jörgen LU (2004) In Ecology Letters 7(12). p.1135-1142
Abstract
Cyclic dynamics of bird and mammal populations are commonly reported in northern latitudes throughout the world, and recent European observations on rodents and grouse suggest that cycle periods decline towards southern latitudes. To investigate latitudinal patterns of cyclic dynamics in North America, we assembled 27 long-term data sets collected between 1939 and 2001 for three grouse species. By fitting the data with autoregressive models to measure direct and delayed density dependence, we show that, in contrast to European studies, North American grouse exhibit period increases from north to south, with cycles collapsing via period lengthening. This occurs because delayed density dependence decreases in southern latitudes, whereas... (More)
Cyclic dynamics of bird and mammal populations are commonly reported in northern latitudes throughout the world, and recent European observations on rodents and grouse suggest that cycle periods decline towards southern latitudes. To investigate latitudinal patterns of cyclic dynamics in North America, we assembled 27 long-term data sets collected between 1939 and 2001 for three grouse species. By fitting the data with autoregressive models to measure direct and delayed density dependence, we show that, in contrast to European studies, North American grouse exhibit period increases from north to south, with cycles collapsing via period lengthening. This occurs because delayed density dependence decreases in southern latitudes, whereas direct density dependence increases. These results show that cyclic dynamics can dissipate by period lengthening as well as the period shortening postulated for European grouse and rodents. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecology Letters
volume
7
issue
12
pages
1135 - 1142
publisher
Wiley-Blackwell
external identifiers
  • wos:000225078000002
  • scopus:9944255304
ISSN
1461-023X
DOI
10.1111/j.1461-0248.2004.00673.x
language
English
LU publication?
yes
id
a893e35c-f7b4-488a-9adf-ca67962fe6bc (old id 147434)
date added to LUP
2007-07-03 15:57:09
date last changed
2017-12-10 03:49:17
@article{a893e35c-f7b4-488a-9adf-ca67962fe6bc,
  abstract     = {Cyclic dynamics of bird and mammal populations are commonly reported in northern latitudes throughout the world, and recent European observations on rodents and grouse suggest that cycle periods decline towards southern latitudes. To investigate latitudinal patterns of cyclic dynamics in North America, we assembled 27 long-term data sets collected between 1939 and 2001 for three grouse species. By fitting the data with autoregressive models to measure direct and delayed density dependence, we show that, in contrast to European studies, North American grouse exhibit period increases from north to south, with cycles collapsing via period lengthening. This occurs because delayed density dependence decreases in southern latitudes, whereas direct density dependence increases. These results show that cyclic dynamics can dissipate by period lengthening as well as the period shortening postulated for European grouse and rodents.},
  author       = {Williams, C K and Ives, A R and Applegate, R D and Ripa, Jörgen},
  issn         = {1461-023X},
  language     = {eng},
  number       = {12},
  pages        = {1135--1142},
  publisher    = {Wiley-Blackwell},
  series       = {Ecology Letters},
  title        = {The collapse of cycles in the dynamics of North American grouse populations},
  url          = {http://dx.doi.org/10.1111/j.1461-0248.2004.00673.x},
  volume       = {7},
  year         = {2004},
}