Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit
We studied the diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern range limit during an apparent high in the Snowshoe Hare (Lepus americanus) population. We performed diet analyses using images from fixed motion sensor cameras and pellet and prey remains collected a...
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Online Access: | https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445 https://doi.org/10.22621/cfn.v135i4.2445 |
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ftjcfn:oai:canadianfieldnaturalist.ca:article/2445 2023-05-15T15:09:21+02:00 Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit Reynolds, Madison Shook, John Breed, Greg Kielland, Knut 2022-04-28 application/pdf https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445 https://doi.org/10.22621/cfn.v135i4.2445 eng eng The Ottawa Field-Naturalists' Club https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445/2775 https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445/2777 https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445 doi:10.22621/cfn.v135i4.2445 Copyright (c) 2022 The Canadian Field-Naturalist The Canadian Field-Naturalist; Vol. 135 No. 4 (2021); 337-345 0008-3550 Great Horned Owl Bubo virginianus diet Snowshoe Hare direct observation pellet analysis nest camera Arctic Alaskan boreal forest info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftjcfn https://doi.org/10.22621/cfn.v135i4.2445 2022-05-01T17:34:03Z We studied the diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern range limit during an apparent high in the Snowshoe Hare (Lepus americanus) population. We performed diet analyses using images from fixed motion sensor cameras and pellet and prey remains collected at active nests, and gathered data on breeding success through camera and visual observations. Pellet data at 14 nests produced 1277 prey records consisting of 65–95% Snowshoe Hare biomass. Great Horned Owls ate 18 different prey types, with overall biomass consisting of 93% mammal, 7% bird, and less than 1% insects, frogs, and fish. The mean prey mass of 714 g (± 34 SE) was 2–25 times the mean prey mass of studies of this species at more southerly latitudes. Camera observations showed that Great Horned Owls delivered an average of 459 g/chick/d (± 75) throughout nesting. This was significantly (P = 0.005) higher than observations from Alberta, at 328–411 g/chick/d. Pellet/prey remains data showed that Great Horned Owls delivering a higher proportion of hares to their nestlings successfully raised more chicks (χ21 = 6.3, P = 0.012), highlighting the importance of this prey in the population dynamics of Great Horned Owl. In addition, we observed Snowshoe Hare removing pellets beneath nest sites, revealing an apparently undocumented bias to the use of pellet analysis. Article in Journal/Newspaper Arctic The Canadian Field-Naturalist (E-Journal) Arctic The Canadian Field-Naturalist 135 4 337 345 |
institution |
Open Polar |
collection |
The Canadian Field-Naturalist (E-Journal) |
op_collection_id |
ftjcfn |
language |
English |
topic |
Great Horned Owl Bubo virginianus diet Snowshoe Hare direct observation pellet analysis nest camera Arctic Alaskan boreal forest |
spellingShingle |
Great Horned Owl Bubo virginianus diet Snowshoe Hare direct observation pellet analysis nest camera Arctic Alaskan boreal forest Reynolds, Madison Shook, John Breed, Greg Kielland, Knut Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit |
topic_facet |
Great Horned Owl Bubo virginianus diet Snowshoe Hare direct observation pellet analysis nest camera Arctic Alaskan boreal forest |
description |
We studied the diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern range limit during an apparent high in the Snowshoe Hare (Lepus americanus) population. We performed diet analyses using images from fixed motion sensor cameras and pellet and prey remains collected at active nests, and gathered data on breeding success through camera and visual observations. Pellet data at 14 nests produced 1277 prey records consisting of 65–95% Snowshoe Hare biomass. Great Horned Owls ate 18 different prey types, with overall biomass consisting of 93% mammal, 7% bird, and less than 1% insects, frogs, and fish. The mean prey mass of 714 g (± 34 SE) was 2–25 times the mean prey mass of studies of this species at more southerly latitudes. Camera observations showed that Great Horned Owls delivered an average of 459 g/chick/d (± 75) throughout nesting. This was significantly (P = 0.005) higher than observations from Alberta, at 328–411 g/chick/d. Pellet/prey remains data showed that Great Horned Owls delivering a higher proportion of hares to their nestlings successfully raised more chicks (χ21 = 6.3, P = 0.012), highlighting the importance of this prey in the population dynamics of Great Horned Owl. In addition, we observed Snowshoe Hare removing pellets beneath nest sites, revealing an apparently undocumented bias to the use of pellet analysis. |
format |
Article in Journal/Newspaper |
author |
Reynolds, Madison Shook, John Breed, Greg Kielland, Knut |
author_facet |
Reynolds, Madison Shook, John Breed, Greg Kielland, Knut |
author_sort |
Reynolds, Madison |
title |
Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit |
title_short |
Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit |
title_full |
Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit |
title_fullStr |
Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit |
title_full_unstemmed |
Diet and reproductive success of Great Horned Owl (Bubo virginianus) at its northern breeding limit |
title_sort |
diet and reproductive success of great horned owl (bubo virginianus) at its northern breeding limit |
publisher |
The Ottawa Field-Naturalists' Club |
publishDate |
2022 |
url |
https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445 https://doi.org/10.22621/cfn.v135i4.2445 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
The Canadian Field-Naturalist; Vol. 135 No. 4 (2021); 337-345 0008-3550 |
op_relation |
https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445/2775 https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445/2777 https://www.canadianfieldnaturalist.ca/index.php/cfn/article/view/2445 doi:10.22621/cfn.v135i4.2445 |
op_rights |
Copyright (c) 2022 The Canadian Field-Naturalist |
op_doi |
https://doi.org/10.22621/cfn.v135i4.2445 |
container_title |
The Canadian Field-Naturalist |
container_volume |
135 |
container_issue |
4 |
container_start_page |
337 |
op_container_end_page |
345 |
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1766340568035622912 |