Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories
ABSTRACT. We studied the breeding ecology of greater and lesser scaup on islands of the North Arm of Great Slave Lake, Northwest Territories, and on the nearby mainland during 1990 – 98. The occurrence of nests of both species on the North Arm islands was determined primarily by the distribution of...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.487.6171 2023-05-15T14:19:44+02:00 Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories Michael A. Fournier James E. Hines The Pennsylvania State University CiteSeerX Archives 2001 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6171 http://pubs.aina.ucalgary.ca/arctic/Arctic54-4-444.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6171 http://pubs.aina.ucalgary.ca/arctic/Arctic54-4-444.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic54-4-444.pdf Key words Aythya affinis Aythya marila boreal forest egg success greater scaup lesser scaup hatchability nest success Northwest Territories Subarctic text 2001 ftciteseerx 2016-01-08T08:17:01Z ABSTRACT. We studied the breeding ecology of greater and lesser scaup on islands of the North Arm of Great Slave Lake, Northwest Territories, and on the nearby mainland during 1990 – 98. The occurrence of nests of both species on the North Arm islands was determined primarily by the distribution of nesting gulls and terns and secondarily by habitat features. Nest parasitism was frequent on the islands, but not on the mainland. Average clutch size was 8.99 ± 0.12 (n = 169) for greater scaup and 9.20 ± 0.17 (n = 93) for lesser scaup on the North Arm, and 8.71 ± 0.18 (n = 55) for lesser scaup on the mainland. No greater scaup nests were found on the mainland. Apparent nest success on the islands was higher (greater scaup 75%, n = 271; lesser scaup 77%, n = 158) than on the mainland (lesser scaup 37%, n = 59). Apparent egg success was 63 % (n = 1485) for greater scaup and 67% (n = 934) for lesser scaup on the islands, and 40 % (n = 435) for lesser scaup on the mainland. Hatchability of eggs was 98% (n = 556) for greater scaup and 94 % (n = 416) for lesser scaup on islands, and 98 % (n = 435) for lesser scaup on the mainland. Our findings, when compared to those of previous studies, do not indicate that either clutch size or egg hatchability has declined in recent years. Therefore, it seems unlikely that broad changes in these reproductive parameters are responsible for local or continental declines in lesser scaup populations. However, nest success on our mainland study area may have been too low to maintain the local population. Text Arctic Aythya marila Great Slave Lake greater scaup North Arm Northwest Territories Subarctic Unknown Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Northwest Territories |
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Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Key words Aythya affinis Aythya marila boreal forest egg success greater scaup lesser scaup hatchability nest success Northwest Territories Subarctic |
spellingShingle |
Key words Aythya affinis Aythya marila boreal forest egg success greater scaup lesser scaup hatchability nest success Northwest Territories Subarctic Michael A. Fournier James E. Hines Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories |
topic_facet |
Key words Aythya affinis Aythya marila boreal forest egg success greater scaup lesser scaup hatchability nest success Northwest Territories Subarctic |
description |
ABSTRACT. We studied the breeding ecology of greater and lesser scaup on islands of the North Arm of Great Slave Lake, Northwest Territories, and on the nearby mainland during 1990 – 98. The occurrence of nests of both species on the North Arm islands was determined primarily by the distribution of nesting gulls and terns and secondarily by habitat features. Nest parasitism was frequent on the islands, but not on the mainland. Average clutch size was 8.99 ± 0.12 (n = 169) for greater scaup and 9.20 ± 0.17 (n = 93) for lesser scaup on the North Arm, and 8.71 ± 0.18 (n = 55) for lesser scaup on the mainland. No greater scaup nests were found on the mainland. Apparent nest success on the islands was higher (greater scaup 75%, n = 271; lesser scaup 77%, n = 158) than on the mainland (lesser scaup 37%, n = 59). Apparent egg success was 63 % (n = 1485) for greater scaup and 67% (n = 934) for lesser scaup on the islands, and 40 % (n = 435) for lesser scaup on the mainland. Hatchability of eggs was 98% (n = 556) for greater scaup and 94 % (n = 416) for lesser scaup on islands, and 98 % (n = 435) for lesser scaup on the mainland. Our findings, when compared to those of previous studies, do not indicate that either clutch size or egg hatchability has declined in recent years. Therefore, it seems unlikely that broad changes in these reproductive parameters are responsible for local or continental declines in lesser scaup populations. However, nest success on our mainland study area may have been too low to maintain the local population. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael A. Fournier James E. Hines |
author_facet |
Michael A. Fournier James E. Hines |
author_sort |
Michael A. Fournier |
title |
Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories |
title_short |
Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories |
title_full |
Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories |
title_fullStr |
Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories |
title_full_unstemmed |
Breeding Ecology of Sympatric Greater and Lesser Scaup (Aythya marila and Aythya affinis) in the Subarctic Northwest Territories |
title_sort |
breeding ecology of sympatric greater and lesser scaup (aythya marila and aythya affinis) in the subarctic northwest territories |
publishDate |
2001 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6171 http://pubs.aina.ucalgary.ca/arctic/Arctic54-4-444.pdf |
long_lat |
ENVELOPE(-114.001,-114.001,61.500,61.500) |
geographic |
Great Slave Lake Northwest Territories |
geographic_facet |
Great Slave Lake Northwest Territories |
genre |
Arctic Aythya marila Great Slave Lake greater scaup North Arm Northwest Territories Subarctic |
genre_facet |
Arctic Aythya marila Great Slave Lake greater scaup North Arm Northwest Territories Subarctic |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic54-4-444.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.6171 http://pubs.aina.ucalgary.ca/arctic/Arctic54-4-444.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766291483353153536 |