Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario
Dwarf birch (Betula glandulosa) and willow (Salix spp.) were the principal winter foods of sympatric willow ptarmigan (Lagopus lagopus), rock ptarmigan (Lagopus mutus), and sharp-tailed grouse (Tympanuchus phasianellus) in northern Ontario. Birch catkins and leaf buds made up 90 and 69% of the diet...
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1984
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Online Access: | http://dx.doi.org/10.1139/z84-328 http://www.nrcresearchpress.com/doi/pdf/10.1139/z84-328 |
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crcansciencepubl:10.1139/z84-328 2023-12-17T10:29:31+01:00 Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario Thomas, V. G. 1984 http://dx.doi.org/10.1139/z84-328 http://www.nrcresearchpress.com/doi/pdf/10.1139/z84-328 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 62, issue 11, page 2258-2263 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1984 crcansciencepubl https://doi.org/10.1139/z84-328 2023-11-19T13:39:11Z Dwarf birch (Betula glandulosa) and willow (Salix spp.) were the principal winter foods of sympatric willow ptarmigan (Lagopus lagopus), rock ptarmigan (Lagopus mutus), and sharp-tailed grouse (Tympanuchus phasianellus) in northern Ontario. Birch catkins and leaf buds made up 90 and 69% of the diet of sharp-tailed grouse and rock ptarmigan, respectively, whereas willow stems and buds formed 68% of the willow ptarmigan diet. Digestive organ weights differed significantly (P < 0.05) among the species of grouse during winter. Within each species, weights of gizzard, caeca, and small intestine were weakly correlated with individual body weight. Total variance in the weight of each digestive organ among species was partitioned into significant effects of species body weight and also species. Seasonal changes to lighter caeca and small intestines were apparent in prebreeding willow ptarmigan and rock ptarmigan coincident with a change in diet to green, growing willow and birch parts. A precise effect of type of diet upon the digestive organ weight of different grouse species was not perceived and was confounded by influences of species body weight. Article in Journal/Newspaper Dwarf birch Lagopus mutus rock ptarmigan Canadian Science Publishing (via Crossref) Canadian Journal of Zoology 62 11 2258 2263 |
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 Thomas, V. G. Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Dwarf birch (Betula glandulosa) and willow (Salix spp.) were the principal winter foods of sympatric willow ptarmigan (Lagopus lagopus), rock ptarmigan (Lagopus mutus), and sharp-tailed grouse (Tympanuchus phasianellus) in northern Ontario. Birch catkins and leaf buds made up 90 and 69% of the diet of sharp-tailed grouse and rock ptarmigan, respectively, whereas willow stems and buds formed 68% of the willow ptarmigan diet. Digestive organ weights differed significantly (P < 0.05) among the species of grouse during winter. Within each species, weights of gizzard, caeca, and small intestine were weakly correlated with individual body weight. Total variance in the weight of each digestive organ among species was partitioned into significant effects of species body weight and also species. Seasonal changes to lighter caeca and small intestines were apparent in prebreeding willow ptarmigan and rock ptarmigan coincident with a change in diet to green, growing willow and birch parts. A precise effect of type of diet upon the digestive organ weight of different grouse species was not perceived and was confounded by influences of species body weight. |
format |
Article in Journal/Newspaper |
author |
Thomas, V. G. |
author_facet |
Thomas, V. G. |
author_sort |
Thomas, V. G. |
title |
Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario |
title_short |
Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario |
title_full |
Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario |
title_fullStr |
Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario |
title_full_unstemmed |
Winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in Ontario |
title_sort |
winter diet and intestinal proportions of rock and willow ptarmigan and sharp-tailed grouse in ontario |
publisher |
Canadian Science Publishing |
publishDate |
1984 |
url |
http://dx.doi.org/10.1139/z84-328 http://www.nrcresearchpress.com/doi/pdf/10.1139/z84-328 |
genre |
Dwarf birch Lagopus mutus rock ptarmigan |
genre_facet |
Dwarf birch Lagopus mutus rock ptarmigan |
op_source |
Canadian Journal of Zoology volume 62, issue 11, page 2258-2263 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z84-328 |
container_title |
Canadian Journal of Zoology |
container_volume |
62 |
container_issue |
11 |
container_start_page |
2258 |
op_container_end_page |
2263 |
_version_ |
1785581915299905536 |