Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area
The once endangered Aleutian Canada goose (Branta canadensis leucopareia) population made a dramatic recovery and was reclassifi ed from endangered to threatened in 1990 and removed from the threatened species list in 2001. In 1997 the birds began using a new spring staging area adjacent to Humboldt...
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International Canada Goose Symposium
2004
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ftcalifstateuniv:oai:scholarworks:2227ms23j 2024-09-30T14:22:07+00:00 Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area Jeffrey M. Black Paul Springer Eric T. Nelson Kenneth M. Griggs Travis D. Taylor Anthony Maguire Julie Jacobs 2004 http://hdl.handle.net/2148/737 English eng International Canada Goose Symposium http://hdl.handle.net/2148/737 Aleutian Canada geese Abdominal profile Activity budgets Branta canadensis leucopareia Habitat Article 2004 ftcalifstateuniv 2024-09-10T17:06:14Z The once endangered Aleutian Canada goose (Branta canadensis leucopareia) population made a dramatic recovery and was reclassifi ed from endangered to threatened in 1990 and removed from the threatened species list in 2001. In 1997 the birds began using a new spring staging area adjacent to Humboldt Bay in northern California. The new staging area, primarily dairy pastureland, is located ~150 km south of the population’s traditional spring staging area. Numbers increased in the new area from 1997, and peaked at 19,000 individuals (~50% of the total population) in early March 2002. In the northern Humboldt Bay staging area, foraging sites were located within 1 km of the bay’s associated tributaries. Forty-fi ve percent of goosedays were on pastures characterized as green (>95% green grass) with short to medium grass height (13–30 cm) and with some standing water, which represented 15% of the available habitat. Older pasture of medium grass height (30–60 cm) with standing water represented only 2% of available habitat but was the second most frequently used habitat (25%). At night the geese roosted initially on a pasture that was surrounded by narrow tributaries and later on a temporarily fl ooded pasture located behind large dunes that provided shelter from prevailing oceanic winds. A comparison between farms that did and did not attract the geese indicated that geese favored habitats with a larger percent cover of water (fresh or brackish) and those near to bodies of fresh water >750 m2. The geese spent 87% of the observed periods foraging on pasture plants. The continual increase in abdominal fat score indices over 90 days indicated that the geese were apparently acquiring reserves beyond requirements for daily maintenance energy. Black JM, Springer P, Nelson ET, Griggs, KM, Taylor T, Thompson ZD, Maguire A & Jacobs J 2004. Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area. Page 106-113 in T.J. Moser, K.C.VerCauteren, R.D. Lien, K.F. Abraham, D.E. ... Article in Journal/Newspaper aleutian canada goose Branta canadensis Branta canadensis leucopareia Canada Goose Scholarworks from California State University Canada Maguire ENVELOPE(66.917,66.917,-74.017,-74.017) Moser ENVELOPE(-62.317,-62.317,-64.850,-64.850) |
institution |
Open Polar |
collection |
Scholarworks from California State University |
op_collection_id |
ftcalifstateuniv |
language |
English |
topic |
Aleutian Canada geese Abdominal profile Activity budgets Branta canadensis leucopareia Habitat |
spellingShingle |
Aleutian Canada geese Abdominal profile Activity budgets Branta canadensis leucopareia Habitat Jeffrey M. Black Paul Springer Eric T. Nelson Kenneth M. Griggs Travis D. Taylor Anthony Maguire Julie Jacobs Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area |
topic_facet |
Aleutian Canada geese Abdominal profile Activity budgets Branta canadensis leucopareia Habitat |
description |
The once endangered Aleutian Canada goose (Branta canadensis leucopareia) population made a dramatic recovery and was reclassifi ed from endangered to threatened in 1990 and removed from the threatened species list in 2001. In 1997 the birds began using a new spring staging area adjacent to Humboldt Bay in northern California. The new staging area, primarily dairy pastureland, is located ~150 km south of the population’s traditional spring staging area. Numbers increased in the new area from 1997, and peaked at 19,000 individuals (~50% of the total population) in early March 2002. In the northern Humboldt Bay staging area, foraging sites were located within 1 km of the bay’s associated tributaries. Forty-fi ve percent of goosedays were on pastures characterized as green (>95% green grass) with short to medium grass height (13–30 cm) and with some standing water, which represented 15% of the available habitat. Older pasture of medium grass height (30–60 cm) with standing water represented only 2% of available habitat but was the second most frequently used habitat (25%). At night the geese roosted initially on a pasture that was surrounded by narrow tributaries and later on a temporarily fl ooded pasture located behind large dunes that provided shelter from prevailing oceanic winds. A comparison between farms that did and did not attract the geese indicated that geese favored habitats with a larger percent cover of water (fresh or brackish) and those near to bodies of fresh water >750 m2. The geese spent 87% of the observed periods foraging on pasture plants. The continual increase in abdominal fat score indices over 90 days indicated that the geese were apparently acquiring reserves beyond requirements for daily maintenance energy. Black JM, Springer P, Nelson ET, Griggs, KM, Taylor T, Thompson ZD, Maguire A & Jacobs J 2004. Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area. Page 106-113 in T.J. Moser, K.C.VerCauteren, R.D. Lien, K.F. Abraham, D.E. ... |
format |
Article in Journal/Newspaper |
author |
Jeffrey M. Black Paul Springer Eric T. Nelson Kenneth M. Griggs Travis D. Taylor Anthony Maguire Julie Jacobs |
author_facet |
Jeffrey M. Black Paul Springer Eric T. Nelson Kenneth M. Griggs Travis D. Taylor Anthony Maguire Julie Jacobs |
author_sort |
Jeffrey M. Black |
title |
Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area |
title_short |
Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area |
title_full |
Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area |
title_fullStr |
Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area |
title_full_unstemmed |
Site selection and foraging behavior of Aleutian Canada geese in a newly colonized spring staging area |
title_sort |
site selection and foraging behavior of aleutian canada geese in a newly colonized spring staging area |
publisher |
International Canada Goose Symposium |
publishDate |
2004 |
url |
http://hdl.handle.net/2148/737 |
long_lat |
ENVELOPE(66.917,66.917,-74.017,-74.017) ENVELOPE(-62.317,-62.317,-64.850,-64.850) |
geographic |
Canada Maguire Moser |
geographic_facet |
Canada Maguire Moser |
genre |
aleutian canada goose Branta canadensis Branta canadensis leucopareia Canada Goose |
genre_facet |
aleutian canada goose Branta canadensis Branta canadensis leucopareia Canada Goose |
op_relation |
http://hdl.handle.net/2148/737 |
_version_ |
1811633093728010240 |