Quantifying grizzly bear selection of natural and anthropogenic edges

Benjamin P. Stewart, Trisalyn Nelson, Karen Laberee, Scott E. Nielsen, Michael A. Wulder, Gordon Stenhouse

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Understanding the use of edges by threatened species is important for conservation and management. Whereas the effects of anthropogenic edges on threatened species have been studied, the effects of natural edges are unknown. We studied grizzly bear (Ursus arctos) habitat selection in relation to different landscape-level measures of edge, both natural and anthropogenic. We used a database of global positioning system telemetry data collected from 26 grizzly bears from 2005 to 2009 in the foothills of the Rocky Mountains in west-central Alberta, Canada. We quantified grizzly bear locations relative to natural edges extracted from satellite-derived land cover data and anthropogenic edges from existing vector datasets (roads, pipelines, and forest harvests). To compare edge distance from observed telemetry points statistically, we generated a distribution of expected points through a conditional randomization of an existing resource selection function describing grizzly bear habitat use without respect to edges. We also measured the density of edges within home ranges and compared this to the overall population to create an edge selection ratio. In general, females selected anthropogenic edges, whereas males selected natural edges. Both sexes selected the natural transition (edge) of shrub to conifer. Females had a greater selection ratio for road edges than males in all seasons, and males had a greater selection ratio for roads in the fall than in other seasons. Only females selected for pipeline edges. Our results indicated that edge habitat was selected by both males and females, mostly in the fall. Given human access to bear habitat is often facilitated by anthropogenic edges (e.g., roads), improved management of these features may minimize human conflicts. In particular, we highlight the importance of the natural transition of shrub to conifer to grizzly bears.

Original languageEnglish (US)
Pages (from-to)957-964
Number of pages8
JournalJournal of Wildlife Management
Volume77
Issue number5
DOIs
StatePublished - Jul 2013
Externally publishedYes

Fingerprint

Ursus arctos
natural selection
road
roads
telemetry
coniferous tree
shrub
threatened species
resource selection
conifers
habitat
bear
shrubs
home range
habitat use
habitat selection
land cover
GPS
global positioning systems
Rocky Mountain region

Keywords

  • Alberta
  • anthropogenic disturbance
  • conditional randomization
  • edge
  • grizzly bear
  • habitat selection
  • resource selection function
  • Ursus arctos

ASJC Scopus subject areas

  • Nature and Landscape Conservation
  • Ecology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Stewart, B. P., Nelson, T., Laberee, K., Nielsen, S. E., Wulder, M. A., & Stenhouse, G. (2013). Quantifying grizzly bear selection of natural and anthropogenic edges. Journal of Wildlife Management, 77(5), 957-964. https://doi.org/10.1002/jwmg.535

Quantifying grizzly bear selection of natural and anthropogenic edges. / Stewart, Benjamin P.; Nelson, Trisalyn; Laberee, Karen; Nielsen, Scott E.; Wulder, Michael A.; Stenhouse, Gordon.

In: Journal of Wildlife Management, Vol. 77, No. 5, 07.2013, p. 957-964.

Research output: Contribution to journalArticle

Stewart, BP, Nelson, T, Laberee, K, Nielsen, SE, Wulder, MA & Stenhouse, G 2013, 'Quantifying grizzly bear selection of natural and anthropogenic edges', Journal of Wildlife Management, vol. 77, no. 5, pp. 957-964. https://doi.org/10.1002/jwmg.535
Stewart, Benjamin P. ; Nelson, Trisalyn ; Laberee, Karen ; Nielsen, Scott E. ; Wulder, Michael A. ; Stenhouse, Gordon. / Quantifying grizzly bear selection of natural and anthropogenic edges. In: Journal of Wildlife Management. 2013 ; Vol. 77, No. 5. pp. 957-964.
@article{fec59b9f324c4ea1a1f54d988ee2c179,
title = "Quantifying grizzly bear selection of natural and anthropogenic edges",
abstract = "Understanding the use of edges by threatened species is important for conservation and management. Whereas the effects of anthropogenic edges on threatened species have been studied, the effects of natural edges are unknown. We studied grizzly bear (Ursus arctos) habitat selection in relation to different landscape-level measures of edge, both natural and anthropogenic. We used a database of global positioning system telemetry data collected from 26 grizzly bears from 2005 to 2009 in the foothills of the Rocky Mountains in west-central Alberta, Canada. We quantified grizzly bear locations relative to natural edges extracted from satellite-derived land cover data and anthropogenic edges from existing vector datasets (roads, pipelines, and forest harvests). To compare edge distance from observed telemetry points statistically, we generated a distribution of expected points through a conditional randomization of an existing resource selection function describing grizzly bear habitat use without respect to edges. We also measured the density of edges within home ranges and compared this to the overall population to create an edge selection ratio. In general, females selected anthropogenic edges, whereas males selected natural edges. Both sexes selected the natural transition (edge) of shrub to conifer. Females had a greater selection ratio for road edges than males in all seasons, and males had a greater selection ratio for roads in the fall than in other seasons. Only females selected for pipeline edges. Our results indicated that edge habitat was selected by both males and females, mostly in the fall. Given human access to bear habitat is often facilitated by anthropogenic edges (e.g., roads), improved management of these features may minimize human conflicts. In particular, we highlight the importance of the natural transition of shrub to conifer to grizzly bears.",
keywords = "Alberta, anthropogenic disturbance, conditional randomization, edge, grizzly bear, habitat selection, resource selection function, Ursus arctos",
author = "Stewart, {Benjamin P.} and Trisalyn Nelson and Karen Laberee and Nielsen, {Scott E.} and Wulder, {Michael A.} and Gordon Stenhouse",
year = "2013",
month = "7",
doi = "10.1002/jwmg.535",
language = "English (US)",
volume = "77",
pages = "957--964",
journal = "Journal of Wildlife Management",
issn = "0022-541X",
publisher = "Wiley-Blackwell",
number = "5",

}

TY - JOUR

T1 - Quantifying grizzly bear selection of natural and anthropogenic edges

AU - Stewart, Benjamin P.

AU - Nelson, Trisalyn

AU - Laberee, Karen

AU - Nielsen, Scott E.

AU - Wulder, Michael A.

AU - Stenhouse, Gordon

PY - 2013/7

Y1 - 2013/7

N2 - Understanding the use of edges by threatened species is important for conservation and management. Whereas the effects of anthropogenic edges on threatened species have been studied, the effects of natural edges are unknown. We studied grizzly bear (Ursus arctos) habitat selection in relation to different landscape-level measures of edge, both natural and anthropogenic. We used a database of global positioning system telemetry data collected from 26 grizzly bears from 2005 to 2009 in the foothills of the Rocky Mountains in west-central Alberta, Canada. We quantified grizzly bear locations relative to natural edges extracted from satellite-derived land cover data and anthropogenic edges from existing vector datasets (roads, pipelines, and forest harvests). To compare edge distance from observed telemetry points statistically, we generated a distribution of expected points through a conditional randomization of an existing resource selection function describing grizzly bear habitat use without respect to edges. We also measured the density of edges within home ranges and compared this to the overall population to create an edge selection ratio. In general, females selected anthropogenic edges, whereas males selected natural edges. Both sexes selected the natural transition (edge) of shrub to conifer. Females had a greater selection ratio for road edges than males in all seasons, and males had a greater selection ratio for roads in the fall than in other seasons. Only females selected for pipeline edges. Our results indicated that edge habitat was selected by both males and females, mostly in the fall. Given human access to bear habitat is often facilitated by anthropogenic edges (e.g., roads), improved management of these features may minimize human conflicts. In particular, we highlight the importance of the natural transition of shrub to conifer to grizzly bears.

AB - Understanding the use of edges by threatened species is important for conservation and management. Whereas the effects of anthropogenic edges on threatened species have been studied, the effects of natural edges are unknown. We studied grizzly bear (Ursus arctos) habitat selection in relation to different landscape-level measures of edge, both natural and anthropogenic. We used a database of global positioning system telemetry data collected from 26 grizzly bears from 2005 to 2009 in the foothills of the Rocky Mountains in west-central Alberta, Canada. We quantified grizzly bear locations relative to natural edges extracted from satellite-derived land cover data and anthropogenic edges from existing vector datasets (roads, pipelines, and forest harvests). To compare edge distance from observed telemetry points statistically, we generated a distribution of expected points through a conditional randomization of an existing resource selection function describing grizzly bear habitat use without respect to edges. We also measured the density of edges within home ranges and compared this to the overall population to create an edge selection ratio. In general, females selected anthropogenic edges, whereas males selected natural edges. Both sexes selected the natural transition (edge) of shrub to conifer. Females had a greater selection ratio for road edges than males in all seasons, and males had a greater selection ratio for roads in the fall than in other seasons. Only females selected for pipeline edges. Our results indicated that edge habitat was selected by both males and females, mostly in the fall. Given human access to bear habitat is often facilitated by anthropogenic edges (e.g., roads), improved management of these features may minimize human conflicts. In particular, we highlight the importance of the natural transition of shrub to conifer to grizzly bears.

KW - Alberta

KW - anthropogenic disturbance

KW - conditional randomization

KW - edge

KW - grizzly bear

KW - habitat selection

KW - resource selection function

KW - Ursus arctos

UR - http://www.scopus.com/inward/record.url?scp=84879569746&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879569746&partnerID=8YFLogxK

U2 - 10.1002/jwmg.535

DO - 10.1002/jwmg.535

M3 - Article

AN - SCOPUS:84879569746

VL - 77

SP - 957

EP - 964

JO - Journal of Wildlife Management

JF - Journal of Wildlife Management

SN - 0022-541X

IS - 5

ER -