The implications of environmental variability on caribou demography: theoretical considerations
Random environmental influences, such as snow cover, are widely regarded as an integral feature of caribou population dynamics. We conducted computer simulations to explore the ramifications of such stochastic variability for caribou demography. We devised 4 models with increasing levels of complexi...
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1991
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ftunitroemsoe:oai:ojs.henry.ub.uit.no:article/994 2023-05-15T18:03:55+02:00 The implications of environmental variability on caribou demography: theoretical considerations Schaefer, James A. Messier, Francois 1991-10-01 application/pdf https://septentrio.uit.no/index.php/rangifer/article/view/994 https://doi.org/10.7557/2.11.4.994 eng eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/rangifer/article/view/994/950 https://septentrio.uit.no/index.php/rangifer/article/view/994 doi:10.7557/2.11.4.994 Copyright (c) 2015 James A. Schaefer, Francois Messier http://creativecommons.org/licenses/by/3.0/ CC-BY Rangifer; Vol 11 (1991): Special Issue No. 7; 53-59 1890-6729 caribou demography computer simulation environmental variability population dynamics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1991 ftunitroemsoe https://doi.org/10.7557/2.11.4.994 2021-08-16T14:45:21Z Random environmental influences, such as snow cover, are widely regarded as an integral feature of caribou population dynamics. We conducted computer simulations to explore the ramifications of such stochastic variability for caribou demography. We devised 4 models with increasing levels of complexity: Model 1, density-independence under different levels of stochasticity and r; Model 2, non-linear effect of snow cover on r; Model 3, non-linear effect of snow cover on r and stochasticity as a function of population size; and Model 4, non-linear effect of snow cover on r, stochasticity as a funciton of population size, and density-dependence according to the logistic equation. The results of Model 1 indicated that nearly all caribou populations subject only to environmental vagaries experienced either extincition or irruption. Model 2 revealed that non-linear effect of snow cover depressed the realised r as a function of population size. Finally, Model 4 suggested long-term population as previously reported in literature, but with reduced chance of overshooting K under moderate to high environmental variability. Article in Journal/Newspaper Rangifer University of Tromsø: Septentrio Academic Publishing Rangifer 11 4 53 |
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Open Polar |
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University of Tromsø: Septentrio Academic Publishing |
op_collection_id |
ftunitroemsoe |
language |
English |
topic |
caribou demography computer simulation environmental variability population dynamics |
spellingShingle |
caribou demography computer simulation environmental variability population dynamics Schaefer, James A. Messier, Francois The implications of environmental variability on caribou demography: theoretical considerations |
topic_facet |
caribou demography computer simulation environmental variability population dynamics |
description |
Random environmental influences, such as snow cover, are widely regarded as an integral feature of caribou population dynamics. We conducted computer simulations to explore the ramifications of such stochastic variability for caribou demography. We devised 4 models with increasing levels of complexity: Model 1, density-independence under different levels of stochasticity and r; Model 2, non-linear effect of snow cover on r; Model 3, non-linear effect of snow cover on r and stochasticity as a function of population size; and Model 4, non-linear effect of snow cover on r, stochasticity as a funciton of population size, and density-dependence according to the logistic equation. The results of Model 1 indicated that nearly all caribou populations subject only to environmental vagaries experienced either extincition or irruption. Model 2 revealed that non-linear effect of snow cover depressed the realised r as a function of population size. Finally, Model 4 suggested long-term population as previously reported in literature, but with reduced chance of overshooting K under moderate to high environmental variability. |
format |
Article in Journal/Newspaper |
author |
Schaefer, James A. Messier, Francois |
author_facet |
Schaefer, James A. Messier, Francois |
author_sort |
Schaefer, James A. |
title |
The implications of environmental variability on caribou demography: theoretical considerations |
title_short |
The implications of environmental variability on caribou demography: theoretical considerations |
title_full |
The implications of environmental variability on caribou demography: theoretical considerations |
title_fullStr |
The implications of environmental variability on caribou demography: theoretical considerations |
title_full_unstemmed |
The implications of environmental variability on caribou demography: theoretical considerations |
title_sort |
implications of environmental variability on caribou demography: theoretical considerations |
publisher |
Septentrio Academic Publishing |
publishDate |
1991 |
url |
https://septentrio.uit.no/index.php/rangifer/article/view/994 https://doi.org/10.7557/2.11.4.994 |
genre |
Rangifer |
genre_facet |
Rangifer |
op_source |
Rangifer; Vol 11 (1991): Special Issue No. 7; 53-59 1890-6729 |
op_relation |
https://septentrio.uit.no/index.php/rangifer/article/view/994/950 https://septentrio.uit.no/index.php/rangifer/article/view/994 doi:10.7557/2.11.4.994 |
op_rights |
Copyright (c) 2015 James A. Schaefer, Francois Messier http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7557/2.11.4.994 |
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Rangifer |
container_volume |
11 |
container_issue |
4 |
container_start_page |
53 |
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1766175102671519744 |