Bioenergetics and food use of wintering and staging Atlantic brant
I conducted behavioral and food sampling of Atlantic brant (Branta bernicla hrota) across their winter range on the northeastern coast of the USA. I used time-activity budgets to estimate daily energy expenditure (DEE) of brant. Sampling occurred 1 Dec -- 31 May 2006–2008 in eleven 225 km2 sites bet...
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University of Delaware
2010
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ftunivdelaware:oai:udspace.udel.edu:19716/5952 2023-06-11T04:10:42+02:00 Bioenergetics and food use of wintering and staging Atlantic brant Ladin, Zachary S. 2010 application/pdf http://udspace.udel.edu/handle/19716/5952 unknown University of Delaware http://udspace.udel.edu/handle/19716/5952 Bioenergetics Brant -- Food -- Atlantic Ocean Thesis 2010 ftunivdelaware 2023-05-01T12:58:19Z I conducted behavioral and food sampling of Atlantic brant (Branta bernicla hrota) across their winter range on the northeastern coast of the USA. I used time-activity budgets to estimate daily energy expenditure (DEE) of brant. Sampling occurred 1 Dec -- 31 May 2006–2008 in eleven 225 km2 sites between Rhode Island and Virginia containing important estuarine and upland habitat. Overall DEE for brant was 1,530±64 kJ/day. There was considerable variation in time-activity budgets between years, months, regions, habitat, tide, temperature, and time-of-day, and I detected no significant difference in DEE of brant between years or regions. However, DEE was significantly different between months and ranged from 2,018±173 kJ/day in January to 1,048±137 kJ/day in May. Brant spent most of their time feeding (32%), swimming (26%), resting (16%), and flying (15%). I also quantified diet of brant and energy density of food plants. Brant mostly ate macroalgae (Ulva sp., Enteromorpha sp.) in early-mid winter and salt marsh cordgrass (Spartina alterniflora) and upland grass and clover (Poa sp. and Trifollium sp.) in late winter and spring. Energy density differed by vegetation type: macroalgae (12.6±0.1 kJ/g), eelgrass (Zostera marina) (14.1±0.1 kJ/g), salt marsh cordgrass (16.9±0.2 kJ/g), and upland grass and clover (17.7±0.1 kJ/g). I explored variation in the diet of brant between 1 November – 31 May 2007-2008. I determined dietary trends using stable δ13C and δ15N isotopes in four known food sources that brant eat. I predicted relative contributions from food sources would differ between months as food source availability shifted over time. I sampled liver and leg muscle tissues from 525 individuals over a seven month winter period in four geographic regions. I measured δ13C and δ15N in each of the tissues and food sources collected within each region. I detected significant differences between regional and monthly δ13C and δ15N ratios in both liver and leg tissues. Dietary trends were determined using Bayesian ... Thesis Branta bernicla The University of Delaware Library Institutional Repository Dee ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
institution |
Open Polar |
collection |
The University of Delaware Library Institutional Repository |
op_collection_id |
ftunivdelaware |
language |
unknown |
topic |
Bioenergetics Brant -- Food -- Atlantic Ocean |
spellingShingle |
Bioenergetics Brant -- Food -- Atlantic Ocean Ladin, Zachary S. Bioenergetics and food use of wintering and staging Atlantic brant |
topic_facet |
Bioenergetics Brant -- Food -- Atlantic Ocean |
description |
I conducted behavioral and food sampling of Atlantic brant (Branta bernicla hrota) across their winter range on the northeastern coast of the USA. I used time-activity budgets to estimate daily energy expenditure (DEE) of brant. Sampling occurred 1 Dec -- 31 May 2006–2008 in eleven 225 km2 sites between Rhode Island and Virginia containing important estuarine and upland habitat. Overall DEE for brant was 1,530±64 kJ/day. There was considerable variation in time-activity budgets between years, months, regions, habitat, tide, temperature, and time-of-day, and I detected no significant difference in DEE of brant between years or regions. However, DEE was significantly different between months and ranged from 2,018±173 kJ/day in January to 1,048±137 kJ/day in May. Brant spent most of their time feeding (32%), swimming (26%), resting (16%), and flying (15%). I also quantified diet of brant and energy density of food plants. Brant mostly ate macroalgae (Ulva sp., Enteromorpha sp.) in early-mid winter and salt marsh cordgrass (Spartina alterniflora) and upland grass and clover (Poa sp. and Trifollium sp.) in late winter and spring. Energy density differed by vegetation type: macroalgae (12.6±0.1 kJ/g), eelgrass (Zostera marina) (14.1±0.1 kJ/g), salt marsh cordgrass (16.9±0.2 kJ/g), and upland grass and clover (17.7±0.1 kJ/g). I explored variation in the diet of brant between 1 November – 31 May 2007-2008. I determined dietary trends using stable δ13C and δ15N isotopes in four known food sources that brant eat. I predicted relative contributions from food sources would differ between months as food source availability shifted over time. I sampled liver and leg muscle tissues from 525 individuals over a seven month winter period in four geographic regions. I measured δ13C and δ15N in each of the tissues and food sources collected within each region. I detected significant differences between regional and monthly δ13C and δ15N ratios in both liver and leg tissues. Dietary trends were determined using Bayesian ... |
format |
Thesis |
author |
Ladin, Zachary S. |
author_facet |
Ladin, Zachary S. |
author_sort |
Ladin, Zachary S. |
title |
Bioenergetics and food use of wintering and staging Atlantic brant |
title_short |
Bioenergetics and food use of wintering and staging Atlantic brant |
title_full |
Bioenergetics and food use of wintering and staging Atlantic brant |
title_fullStr |
Bioenergetics and food use of wintering and staging Atlantic brant |
title_full_unstemmed |
Bioenergetics and food use of wintering and staging Atlantic brant |
title_sort |
bioenergetics and food use of wintering and staging atlantic brant |
publisher |
University of Delaware |
publishDate |
2010 |
url |
http://udspace.udel.edu/handle/19716/5952 |
long_lat |
ENVELOPE(-59.767,-59.767,-62.433,-62.433) |
geographic |
Dee |
geographic_facet |
Dee |
genre |
Branta bernicla |
genre_facet |
Branta bernicla |
op_relation |
http://udspace.udel.edu/handle/19716/5952 |
_version_ |
1768385309252255744 |