Demography of barren-ground grizzly bears
Between May 1995 and June 1999, we equipped 81 barren-ground grizzly bears (Ursus arctos) with satellite radio collars within a study area of 235 000 km 2 , centred 400 km northeast of Yellowknife, Northwest Territories, Canada. We used data from radiotelemetry to estimate survival rates, reproducti...
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crcansciencepubl:10.1139/z02-245 2024-05-12T08:09:03+00:00 Demography of barren-ground grizzly bears McLoughlin, Philip D Taylor, Mitchell K Cluff, H Dean Gau, Robert J Mulders, Robert Case, Ray L Boutin, Stan Messier, François 2003 http://dx.doi.org/10.1139/z02-245 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-245 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 81, issue 2, page 294-301 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2003 crcansciencepubl https://doi.org/10.1139/z02-245 2024-04-18T06:54:54Z Between May 1995 and June 1999, we equipped 81 barren-ground grizzly bears (Ursus arctos) with satellite radio collars within a study area of 235 000 km 2 , centred 400 km northeast of Yellowknife, Northwest Territories, Canada. We used data from radiotelemetry to estimate survival rates, reproductive parameters, and the finite rate of increase of the population (λ). The annual survival rate of adult females was estimated at 0.979 (95% confidence intervals (CI) = 0.9550.998), while the survival rate of adult males was 0.986 (95% CI = 0.9421.0). The cub survival rate was 0.737 (95% CI = 0.6000.844) and the yearling survival rate was 0.683 (95% CI = 0.5140.821). Cub litter size averaged 2.23 (SE = 0.13, n = 35), while yearling litter size decreased to a mean of 1.86 (SE = 0.12, n = 35). The mean litter size of females with 2-year-olds was 1.85 (SE = 0.15, n = 20). The mean birth interval was 2.8 years (SE = 0.3 years, n = 17). The mean reproductive interval, which is calculated by excluding the loss of whole litters from the sample, was 3.9 years (SE = 0.4 years, n = 9). Mean litter size divided by mean birth interval yielded an annual natality rate of 0.81 cubs per adult female per year. The mean age at first parturition was 8.1 years (SE = 0.5 years, n = 10). We believe the population to be currently stable or slightly increasing (λ = 1.033, 95% CI = 1.0081.064). Article in Journal/Newspaper Northwest Territories Ursus arctos Yellowknife Canadian Science Publishing Canada Northwest Territories Yellowknife Canadian Journal of Zoology 81 2 294 301 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics McLoughlin, Philip D Taylor, Mitchell K Cluff, H Dean Gau, Robert J Mulders, Robert Case, Ray L Boutin, Stan Messier, François Demography of barren-ground grizzly bears |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Between May 1995 and June 1999, we equipped 81 barren-ground grizzly bears (Ursus arctos) with satellite radio collars within a study area of 235 000 km 2 , centred 400 km northeast of Yellowknife, Northwest Territories, Canada. We used data from radiotelemetry to estimate survival rates, reproductive parameters, and the finite rate of increase of the population (λ). The annual survival rate of adult females was estimated at 0.979 (95% confidence intervals (CI) = 0.9550.998), while the survival rate of adult males was 0.986 (95% CI = 0.9421.0). The cub survival rate was 0.737 (95% CI = 0.6000.844) and the yearling survival rate was 0.683 (95% CI = 0.5140.821). Cub litter size averaged 2.23 (SE = 0.13, n = 35), while yearling litter size decreased to a mean of 1.86 (SE = 0.12, n = 35). The mean litter size of females with 2-year-olds was 1.85 (SE = 0.15, n = 20). The mean birth interval was 2.8 years (SE = 0.3 years, n = 17). The mean reproductive interval, which is calculated by excluding the loss of whole litters from the sample, was 3.9 years (SE = 0.4 years, n = 9). Mean litter size divided by mean birth interval yielded an annual natality rate of 0.81 cubs per adult female per year. The mean age at first parturition was 8.1 years (SE = 0.5 years, n = 10). We believe the population to be currently stable or slightly increasing (λ = 1.033, 95% CI = 1.0081.064). |
format |
Article in Journal/Newspaper |
author |
McLoughlin, Philip D Taylor, Mitchell K Cluff, H Dean Gau, Robert J Mulders, Robert Case, Ray L Boutin, Stan Messier, François |
author_facet |
McLoughlin, Philip D Taylor, Mitchell K Cluff, H Dean Gau, Robert J Mulders, Robert Case, Ray L Boutin, Stan Messier, François |
author_sort |
McLoughlin, Philip D |
title |
Demography of barren-ground grizzly bears |
title_short |
Demography of barren-ground grizzly bears |
title_full |
Demography of barren-ground grizzly bears |
title_fullStr |
Demography of barren-ground grizzly bears |
title_full_unstemmed |
Demography of barren-ground grizzly bears |
title_sort |
demography of barren-ground grizzly bears |
publisher |
Canadian Science Publishing |
publishDate |
2003 |
url |
http://dx.doi.org/10.1139/z02-245 http://www.nrcresearchpress.com/doi/pdf/10.1139/z02-245 |
geographic |
Canada Northwest Territories Yellowknife |
geographic_facet |
Canada Northwest Territories Yellowknife |
genre |
Northwest Territories Ursus arctos Yellowknife |
genre_facet |
Northwest Territories Ursus arctos Yellowknife |
op_source |
Canadian Journal of Zoology volume 81, issue 2, page 294-301 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z02-245 |
container_title |
Canadian Journal of Zoology |
container_volume |
81 |
container_issue |
2 |
container_start_page |
294 |
op_container_end_page |
301 |
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1798852220480913408 |