Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations
The duckling production of the Oldsquaw (Clangula hyemalis) was studied between 1969 and 1974 in Torne Lapmark in northern Sweden. The degrees of relationship among various indices of reproductive output, climatic factors, and fluctuations in small rodents were estimated. Total brood and duckling pr...
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Canadian Science Publishing
1986
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Online Access: | http://dx.doi.org/10.1139/z86-274 http://www.nrcresearchpress.com/doi/pdf/10.1139/z86-274 |
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crcansciencepubl:10.1139/z86-274 2023-12-17T10:47:32+01:00 Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations Pehrsson, Olof 1986 http://dx.doi.org/10.1139/z86-274 http://www.nrcresearchpress.com/doi/pdf/10.1139/z86-274 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 64, issue 9, page 1835-1841 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1986 crcansciencepubl https://doi.org/10.1139/z86-274 2023-11-19T13:39:11Z The duckling production of the Oldsquaw (Clangula hyemalis) was studied between 1969 and 1974 in Torne Lapmark in northern Sweden. The degrees of relationship among various indices of reproductive output, climatic factors, and fluctuations in small rodents were estimated. Total brood and duckling production were calculated. A correlation between first observations of broods and time of arrival of spring indicated that the Oldsquaw breeds as early as possible, an adaptation to the utilization of ephemeral lakes. Peaks in duckling production correlated well with peaks in the abundance of small rodents but not as well with climatic variables. Twice as many ducklings were produced during the rodent peak years as during the intervening years, and the densities of the Oldsquaw population were highest the year after these peaks in brood production. The positive correlation between duckling production and population size in small rodents seems to be analogous to grouse–rodent cycles, and both are best explained by the predator-shift or the alternative prey hypothesis. Article in Journal/Newspaper Northern Sweden Canadian Science Publishing (via Crossref) Canadian Journal of Zoology 64 9 1835 1841 |
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 Pehrsson, Olof Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The duckling production of the Oldsquaw (Clangula hyemalis) was studied between 1969 and 1974 in Torne Lapmark in northern Sweden. The degrees of relationship among various indices of reproductive output, climatic factors, and fluctuations in small rodents were estimated. Total brood and duckling production were calculated. A correlation between first observations of broods and time of arrival of spring indicated that the Oldsquaw breeds as early as possible, an adaptation to the utilization of ephemeral lakes. Peaks in duckling production correlated well with peaks in the abundance of small rodents but not as well with climatic variables. Twice as many ducklings were produced during the rodent peak years as during the intervening years, and the densities of the Oldsquaw population were highest the year after these peaks in brood production. The positive correlation between duckling production and population size in small rodents seems to be analogous to grouse–rodent cycles, and both are best explained by the predator-shift or the alternative prey hypothesis. |
format |
Article in Journal/Newspaper |
author |
Pehrsson, Olof |
author_facet |
Pehrsson, Olof |
author_sort |
Pehrsson, Olof |
title |
Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations |
title_short |
Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations |
title_full |
Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations |
title_fullStr |
Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations |
title_full_unstemmed |
Duckling production of the Oldsquaw in relation to spring weather and small-rodent fluctuations |
title_sort |
duckling production of the oldsquaw in relation to spring weather and small-rodent fluctuations |
publisher |
Canadian Science Publishing |
publishDate |
1986 |
url |
http://dx.doi.org/10.1139/z86-274 http://www.nrcresearchpress.com/doi/pdf/10.1139/z86-274 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Canadian Journal of Zoology volume 64, issue 9, page 1835-1841 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z86-274 |
container_title |
Canadian Journal of Zoology |
container_volume |
64 |
container_issue |
9 |
container_start_page |
1835 |
op_container_end_page |
1841 |
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1785571420304048128 |