ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories
River delta, N.W.T. Numbers of territorial males on a 65 ha study area have fluctuated between 7 and 28 over this time, with numbers peaking in 1961-62, 1969 and 1980. Peaks in ptarmigan numbers appear to be fairly synchronous over a large geographical area. Large flocks of males were observed in so...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.584.2255 2023-05-15T14:19:41+02:00 ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories Susan J. Hannon Thomas W. Barry The Pennsylvania State University CiteSeerX Archives 1986 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.584.2255 http://pubs.aina.ucalgary.ca/arctic/Arctic39-4-300.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.584.2255 http://pubs.aina.ucalgary.ca/arctic/Arctic39-4-300.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic39-4-300.pdf Key words willow ptarmigan Northwest Territories breeding clutch size demography predation text 1986 ftciteseerx 2016-08-28T00:06:06Z River delta, N.W.T. Numbers of territorial males on a 65 ha study area have fluctuated between 7 and 28 over this time, with numbers peaking in 1961-62, 1969 and 1980. Peaks in ptarmigan numbers appear to be fairly synchronous over a large geographical area. Large flocks of males were observed in some years. In 1978, these males, mainly yearlings, had similar wing lengths to, but weighed slightly more than, territorial males. There appeared to be a shortage of hens in 1978, possibly caused by differential mortality during the winter. Mean clutch size ranged from 8.7 to 10.4 and mean number of fledged chicks per brood ranged from 6.3 to 6.9. Within North America clutch size of willow ptarmigan does not appear to increase with increasing latitude. As in other localities, raptors and foxes appeared to be the main predators of ptarmigan. More males than females were killed on the breeding area, but this could have been because more males were present. Text Arctic Arctic Northwest Territories Unknown Arctic Northwest Territories |
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Unknown |
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English |
topic |
Key words willow ptarmigan Northwest Territories breeding clutch size demography predation |
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Key words willow ptarmigan Northwest Territories breeding clutch size demography predation Susan J. Hannon Thomas W. Barry ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories |
topic_facet |
Key words willow ptarmigan Northwest Territories breeding clutch size demography predation |
description |
River delta, N.W.T. Numbers of territorial males on a 65 ha study area have fluctuated between 7 and 28 over this time, with numbers peaking in 1961-62, 1969 and 1980. Peaks in ptarmigan numbers appear to be fairly synchronous over a large geographical area. Large flocks of males were observed in some years. In 1978, these males, mainly yearlings, had similar wing lengths to, but weighed slightly more than, territorial males. There appeared to be a shortage of hens in 1978, possibly caused by differential mortality during the winter. Mean clutch size ranged from 8.7 to 10.4 and mean number of fledged chicks per brood ranged from 6.3 to 6.9. Within North America clutch size of willow ptarmigan does not appear to increase with increasing latitude. As in other localities, raptors and foxes appeared to be the main predators of ptarmigan. More males than females were killed on the breeding area, but this could have been because more males were present. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Susan J. Hannon Thomas W. Barry |
author_facet |
Susan J. Hannon Thomas W. Barry |
author_sort |
Susan J. Hannon |
title |
ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories |
title_short |
ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories |
title_full |
ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories |
title_fullStr |
ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories |
title_full_unstemmed |
ARCTIC Demography, Breeding Biology and Predation of Willow Ptarmigan at Anderson River Delta, Northwest Territories |
title_sort |
arctic demography, breeding biology and predation of willow ptarmigan at anderson river delta, northwest territories |
publishDate |
1986 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.584.2255 http://pubs.aina.ucalgary.ca/arctic/Arctic39-4-300.pdf |
geographic |
Arctic Northwest Territories |
geographic_facet |
Arctic Northwest Territories |
genre |
Arctic Arctic Northwest Territories |
genre_facet |
Arctic Arctic Northwest Territories |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic39-4-300.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.584.2255 http://pubs.aina.ucalgary.ca/arctic/Arctic39-4-300.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766291451110490112 |