Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans
The daily metabolizable energy intake of an animal is potentially limited by either the available feeding time or by its capacity to process energy. Animals are generally considered not to be time-limited but rather to be energy-processing-limited. This is concluded from the common observation that...
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ftdeakinunifig:oai:figshare.com:article/21007414 2023-05-15T15:46:08+02:00 Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans B Nolet Marcel Klaassen 2005-11-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30035114 https://figshare.com/articles/journal_contribution/Time_and_energy_constraints_in_demanding_phases_of_the_annual_cycle_an_example_of_time_limitation_in_refuelling_migratory_swans/21007414 unknown http://hdl.handle.net/10536/DRO/DU:30035114 https://figshare.com/articles/journal_contribution/Time_and_energy_constraints_in_demanding_phases_of_the_annual_cycle_an_example_of_time_limitation_in_refuelling_migratory_swans/21007414 All Rights Reserved Ecology Science & Technology Life Sciences & Biomedicine Environmental Sciences & Ecology GEESE BRANTA-BERNICLA PEROMYSCUS-MANICULATUS BEWICKS SWANS FUEL LOADS BIRDS BUDGETS ENERGETICS MAMMALS LIMITS COSTS Text Journal contribution 2005 ftdeakinunifig 2022-11-17T22:24:46Z The daily metabolizable energy intake of an animal is potentially limited by either the available feeding time or by its capacity to process energy. Animals are generally considered not to be time-limited but rather to be energy-processing-limited. This is concluded from the common observation that an animal's feeding time per day increases with a decrease in food density. We argue that such changes in feeding time are in theory also expected when no constraints are operating. Thus, a study of the constraints on energy intakes of free-living animals should be performed during demanding phases of the year. As an example, we collected data on time and energy budgets of Bewick's swan ( Cygnus columbianus bewickii ) refuelling during migration on fennel pondweed ( Potamogeton pectinatus ) tubers in two years differing two-fold in tuber biomass density. As predicted by time limitation, the feeding time (defined as the time with the head submerged) did not change in response to a change in food biomass density, both within and between years (averaging 12.2 h d −1 ). Contrary to energy-processing limitation, and again in line with time limitation, the daily metabolizable energy intake varied, being greater in the year with high than in the year with low food densities. We conclude that more studies are needed of animals operating under demanding conditions before it can be assessed whether free-living animals are generally energy-processing- or time-limited. Other Non-Article Part of Journal/Newspaper Branta bernicla Cygnus columbianus DRO - Deakin Research Online |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Ecology Science & Technology Life Sciences & Biomedicine Environmental Sciences & Ecology GEESE BRANTA-BERNICLA PEROMYSCUS-MANICULATUS BEWICKS SWANS FUEL LOADS BIRDS BUDGETS ENERGETICS MAMMALS LIMITS COSTS |
spellingShingle |
Ecology Science & Technology Life Sciences & Biomedicine Environmental Sciences & Ecology GEESE BRANTA-BERNICLA PEROMYSCUS-MANICULATUS BEWICKS SWANS FUEL LOADS BIRDS BUDGETS ENERGETICS MAMMALS LIMITS COSTS B Nolet Marcel Klaassen Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
topic_facet |
Ecology Science & Technology Life Sciences & Biomedicine Environmental Sciences & Ecology GEESE BRANTA-BERNICLA PEROMYSCUS-MANICULATUS BEWICKS SWANS FUEL LOADS BIRDS BUDGETS ENERGETICS MAMMALS LIMITS COSTS |
description |
The daily metabolizable energy intake of an animal is potentially limited by either the available feeding time or by its capacity to process energy. Animals are generally considered not to be time-limited but rather to be energy-processing-limited. This is concluded from the common observation that an animal's feeding time per day increases with a decrease in food density. We argue that such changes in feeding time are in theory also expected when no constraints are operating. Thus, a study of the constraints on energy intakes of free-living animals should be performed during demanding phases of the year. As an example, we collected data on time and energy budgets of Bewick's swan ( Cygnus columbianus bewickii ) refuelling during migration on fennel pondweed ( Potamogeton pectinatus ) tubers in two years differing two-fold in tuber biomass density. As predicted by time limitation, the feeding time (defined as the time with the head submerged) did not change in response to a change in food biomass density, both within and between years (averaging 12.2 h d −1 ). Contrary to energy-processing limitation, and again in line with time limitation, the daily metabolizable energy intake varied, being greater in the year with high than in the year with low food densities. We conclude that more studies are needed of animals operating under demanding conditions before it can be assessed whether free-living animals are generally energy-processing- or time-limited. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
B Nolet Marcel Klaassen |
author_facet |
B Nolet Marcel Klaassen |
author_sort |
B Nolet |
title |
Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
title_short |
Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
title_full |
Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
title_fullStr |
Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
title_full_unstemmed |
Time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
title_sort |
time and energy constraints in demanding phases of the annual cycle : an example of time limitation in refuelling migratory swans |
publishDate |
2005 |
url |
http://hdl.handle.net/10536/DRO/DU:30035114 https://figshare.com/articles/journal_contribution/Time_and_energy_constraints_in_demanding_phases_of_the_annual_cycle_an_example_of_time_limitation_in_refuelling_migratory_swans/21007414 |
genre |
Branta bernicla Cygnus columbianus |
genre_facet |
Branta bernicla Cygnus columbianus |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30035114 https://figshare.com/articles/journal_contribution/Time_and_energy_constraints_in_demanding_phases_of_the_annual_cycle_an_example_of_time_limitation_in_refuelling_migratory_swans/21007414 |
op_rights |
All Rights Reserved |
_version_ |
1766380819278987264 |