Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada
The demographic characteristics of an unexploited Dall sheep population, which inhabits the Sheep Mountain area of the newly established Kluane National Park, are described for the period 1969 to 1980. During this 12-year interval the average population size was 225.8 sheep in June–July, but fluctua...
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Language: | English |
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1983
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crcansciencepubl:10.1139/z83-181 2023-12-17T10:32:57+01:00 Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada Hoefs, Manfred Bayer, Max 1983 http://dx.doi.org/10.1139/z83-181 http://www.nrcresearchpress.com/doi/pdf/10.1139/z83-181 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 61, issue 6, page 1346-1357 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1983 crcansciencepubl https://doi.org/10.1139/z83-181 2023-11-19T13:39:36Z The demographic characteristics of an unexploited Dall sheep population, which inhabits the Sheep Mountain area of the newly established Kluane National Park, are described for the period 1969 to 1980. During this 12-year interval the average population size was 225.8 sheep in June–July, but fluctuations about this mean value of up to 17% were observed; peaks of 256 and 244 were reached in 1971 and 1979, respectively, and a low of 184 was observed in 1977. Variations in population size were caused primarily by differing numbers of lambs and yearlings. The population components averaged as follows: 68.4 males (≥ 3 years), 10.9 males (2 years), 81.1 females (≥ 3 years), 11.1 females (2 years), 24.0 yearlings, and 30.3 lambs. It is assumed that some variation in population size can be expected because of variation in forage production of this population's winter range that is filled to capacity. However, the decline of the population in the mid 1970s was assumed to be caused by increased disturbance and adverse impact by feral horses. A life table for the ram component of this population is constructed. The mean mortality rate of rams from birth was 24.0% and the mean recruitment rate (yearlings to adults 2+ years old) was 15.3%. The population is characterized by low productivity, high survival rate of lambs, and a short maximum life expectancy. Article in Journal/Newspaper Kluane National Park Yukon Canadian Science Publishing (via Crossref) Yukon Canada Canadian Journal of Zoology 61 6 1346 1357 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
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 Hoefs, Manfred Bayer, Max Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The demographic characteristics of an unexploited Dall sheep population, which inhabits the Sheep Mountain area of the newly established Kluane National Park, are described for the period 1969 to 1980. During this 12-year interval the average population size was 225.8 sheep in June–July, but fluctuations about this mean value of up to 17% were observed; peaks of 256 and 244 were reached in 1971 and 1979, respectively, and a low of 184 was observed in 1977. Variations in population size were caused primarily by differing numbers of lambs and yearlings. The population components averaged as follows: 68.4 males (≥ 3 years), 10.9 males (2 years), 81.1 females (≥ 3 years), 11.1 females (2 years), 24.0 yearlings, and 30.3 lambs. It is assumed that some variation in population size can be expected because of variation in forage production of this population's winter range that is filled to capacity. However, the decline of the population in the mid 1970s was assumed to be caused by increased disturbance and adverse impact by feral horses. A life table for the ram component of this population is constructed. The mean mortality rate of rams from birth was 24.0% and the mean recruitment rate (yearlings to adults 2+ years old) was 15.3%. The population is characterized by low productivity, high survival rate of lambs, and a short maximum life expectancy. |
format |
Article in Journal/Newspaper |
author |
Hoefs, Manfred Bayer, Max |
author_facet |
Hoefs, Manfred Bayer, Max |
author_sort |
Hoefs, Manfred |
title |
Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada |
title_short |
Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada |
title_full |
Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada |
title_fullStr |
Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada |
title_full_unstemmed |
Demographic characteristics of an unhunted Dall sheep ( Ovis dalli dalli ) population in southwest Yukon, Canada |
title_sort |
demographic characteristics of an unhunted dall sheep ( ovis dalli dalli ) population in southwest yukon, canada |
publisher |
Canadian Science Publishing |
publishDate |
1983 |
url |
http://dx.doi.org/10.1139/z83-181 http://www.nrcresearchpress.com/doi/pdf/10.1139/z83-181 |
geographic |
Yukon Canada |
geographic_facet |
Yukon Canada |
genre |
Kluane National Park Yukon |
genre_facet |
Kluane National Park Yukon |
op_source |
Canadian Journal of Zoology volume 61, issue 6, page 1346-1357 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z83-181 |
container_title |
Canadian Journal of Zoology |
container_volume |
61 |
container_issue |
6 |
container_start_page |
1346 |
op_container_end_page |
1357 |
_version_ |
1785586806705618944 |