Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability
The area traversed in pursuit of resources defines the size of an animal’s home range. For females, the home range is presumed to be a function of forage availability. However, the presence of offspring may also influence home range size due to reduced mobility, increased nutritional need, and behav...
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ftpubmed:oai:pubmedcentral.nih.gov:3700869 2023-05-15T14:57:56+02:00 Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability Edwards, Mark A. Derocher, Andrew E. Nagy, John A. 2013-07-03 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3700869 http://www.ncbi.nlm.nih.gov/pubmed/23844162 https://doi.org/10.1371/journal.pone.0068130 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3700869 http://www.ncbi.nlm.nih.gov/pubmed/23844162 http://dx.doi.org/10.1371/journal.pone.0068130 This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2013 ftpubmed https://doi.org/10.1371/journal.pone.0068130 2013-09-05T01:58:56Z The area traversed in pursuit of resources defines the size of an animal’s home range. For females, the home range is presumed to be a function of forage availability. However, the presence of offspring may also influence home range size due to reduced mobility, increased nutritional need, and behavioral adaptations of mothers to increase offspring survival. Here, we examine the relationship between resource use and variation in home range size for female barren-ground grizzly bears (Ursus arctos) of the Mackenzie Delta region in Arctic Canada. We develop methods to test hypotheses of home range size that address selection of cover where cover heterogeneity is low, using generalized linear mixed-effects models and an information-theoretic approach. We found that the reproductive status of female grizzlies affected home range size but individually-based spatial availability of highly selected cover in spring and early summer was a stronger correlate. If these preferred covers in spring and early summer, a period of low resource availability for grizzly bears following den-emergence, were patchy and highly dispersed, females travelled farther regardless of the presence or absence of offspring. Increased movement to preferred covers, however, may result in greater risk to the individual or family. Text Arctic Mackenzie Delta Ursus arctos PubMed Central (PMC) Arctic Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) PLoS ONE 8 7 e68130 |
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English |
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Research Article |
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Research Article Edwards, Mark A. Derocher, Andrew E. Nagy, John A. Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability |
topic_facet |
Research Article |
description |
The area traversed in pursuit of resources defines the size of an animal’s home range. For females, the home range is presumed to be a function of forage availability. However, the presence of offspring may also influence home range size due to reduced mobility, increased nutritional need, and behavioral adaptations of mothers to increase offspring survival. Here, we examine the relationship between resource use and variation in home range size for female barren-ground grizzly bears (Ursus arctos) of the Mackenzie Delta region in Arctic Canada. We develop methods to test hypotheses of home range size that address selection of cover where cover heterogeneity is low, using generalized linear mixed-effects models and an information-theoretic approach. We found that the reproductive status of female grizzlies affected home range size but individually-based spatial availability of highly selected cover in spring and early summer was a stronger correlate. If these preferred covers in spring and early summer, a period of low resource availability for grizzly bears following den-emergence, were patchy and highly dispersed, females travelled farther regardless of the presence or absence of offspring. Increased movement to preferred covers, however, may result in greater risk to the individual or family. |
format |
Text |
author |
Edwards, Mark A. Derocher, Andrew E. Nagy, John A. |
author_facet |
Edwards, Mark A. Derocher, Andrew E. Nagy, John A. |
author_sort |
Edwards, Mark A. |
title |
Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability |
title_short |
Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability |
title_full |
Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability |
title_fullStr |
Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability |
title_full_unstemmed |
Home Range Size Variation in Female Arctic Grizzly Bears Relative to Reproductive Status and Resource Availability |
title_sort |
home range size variation in female arctic grizzly bears relative to reproductive status and resource availability |
publisher |
Public Library of Science |
publishDate |
2013 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3700869 http://www.ncbi.nlm.nih.gov/pubmed/23844162 https://doi.org/10.1371/journal.pone.0068130 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Arctic Canada Mackenzie Delta |
geographic_facet |
Arctic Canada Mackenzie Delta |
genre |
Arctic Mackenzie Delta Ursus arctos |
genre_facet |
Arctic Mackenzie Delta Ursus arctos |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3700869 http://www.ncbi.nlm.nih.gov/pubmed/23844162 http://dx.doi.org/10.1371/journal.pone.0068130 |
op_rights |
This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0068130 |
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PLoS ONE |
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8 |
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e68130 |
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