Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans
Declines in Common Loon (Gavia immer) populations associated with increasing human use of lakes have been reported from many areas of North America. In the present report we describe a lake in northern Saskatchewan, Besnard Lake, where there has been a substantial increase in the number of loons, fr...
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1993
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crcansciencepubl:10.1139/z93-235 2023-12-17T10:50:42+01:00 Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans Gerrard, Jon M. Dzus, Elston Bortolotti, Gary R. Gerrard, P. Naomi 1993 http://dx.doi.org/10.1139/z93-235 http://www.nrcresearchpress.com/doi/pdf/10.1139/z93-235 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 71, issue 8, page 1681-1686 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1993 crcansciencepubl https://doi.org/10.1139/z93-235 2023-11-19T13:38:45Z Declines in Common Loon (Gavia immer) populations associated with increasing human use of lakes have been reported from many areas of North America. In the present report we describe a lake in northern Saskatchewan, Besnard Lake, where there has been a substantial increase in the number of loons, from about 85 in 1976–1979 to about 165 in 1990. A comparison was made with numbers of other birds associated with water. Increases were also seen in American White Pelicans (Pelecanus erythrorhynchos), Osprey (Pandion haliaetus), Great Blue Herons (Ardea herodias), Herring Gulls (Larus argentatus), Ring-billed Gulls (L. delawarensis), and Bonaparte's Gulls (L. Philadelphia). No change was seen in mergansers (Mergus merganser and M. serrator), Bald Eagles (Haliaeetus leucocephalus), or Common Terns (Sterna hirundo). The period 1976–1990 has also seen increased human use on Besnard Lake. The reason for increased loon numbers is uncertain, but could possibly be related to an increase in the numbers of small fish in Besnard Lake as a result of increased fishing pressure disproportionately removing the larger, predatory fish. Article in Journal/Newspaper Sterna hirundo osprey Pandion haliaetus Canadian Science Publishing (via Crossref) Besnard ENVELOPE(-63.483,-63.483,-64.826,-64.826) Canadian Journal of Zoology 71 8 1681 1686 |
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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 Gerrard, Jon M. Dzus, Elston Bortolotti, Gary R. Gerrard, P. Naomi Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Declines in Common Loon (Gavia immer) populations associated with increasing human use of lakes have been reported from many areas of North America. In the present report we describe a lake in northern Saskatchewan, Besnard Lake, where there has been a substantial increase in the number of loons, from about 85 in 1976–1979 to about 165 in 1990. A comparison was made with numbers of other birds associated with water. Increases were also seen in American White Pelicans (Pelecanus erythrorhynchos), Osprey (Pandion haliaetus), Great Blue Herons (Ardea herodias), Herring Gulls (Larus argentatus), Ring-billed Gulls (L. delawarensis), and Bonaparte's Gulls (L. Philadelphia). No change was seen in mergansers (Mergus merganser and M. serrator), Bald Eagles (Haliaeetus leucocephalus), or Common Terns (Sterna hirundo). The period 1976–1990 has also seen increased human use on Besnard Lake. The reason for increased loon numbers is uncertain, but could possibly be related to an increase in the numbers of small fish in Besnard Lake as a result of increased fishing pressure disproportionately removing the larger, predatory fish. |
format |
Article in Journal/Newspaper |
author |
Gerrard, Jon M. Dzus, Elston Bortolotti, Gary R. Gerrard, P. Naomi |
author_facet |
Gerrard, Jon M. Dzus, Elston Bortolotti, Gary R. Gerrard, P. Naomi |
author_sort |
Gerrard, Jon M. |
title |
Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans |
title_short |
Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans |
title_full |
Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans |
title_fullStr |
Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans |
title_full_unstemmed |
Water-bird population changes in 1976–1990 on Besnard Lake, Saskatchewan: increases in loons, gulls, and pelicans |
title_sort |
water-bird population changes in 1976–1990 on besnard lake, saskatchewan: increases in loons, gulls, and pelicans |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/z93-235 http://www.nrcresearchpress.com/doi/pdf/10.1139/z93-235 |
long_lat |
ENVELOPE(-63.483,-63.483,-64.826,-64.826) |
geographic |
Besnard |
geographic_facet |
Besnard |
genre |
Sterna hirundo osprey Pandion haliaetus |
genre_facet |
Sterna hirundo osprey Pandion haliaetus |
op_source |
Canadian Journal of Zoology volume 71, issue 8, page 1681-1686 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z93-235 |
container_title |
Canadian Journal of Zoology |
container_volume |
71 |
container_issue |
8 |
container_start_page |
1681 |
op_container_end_page |
1686 |
_version_ |
1785575761950801920 |