Insights from the eco-physiological book of records : Bewick's swans outperform the canonical intake-maximizing vertebrate

Klaassen, Marcel, Hangelbroek, Helen H., de Boer, Thijs and Nolet, Bart A. 2010, Insights from the eco-physiological book of records : Bewick's swans outperform the canonical intake-maximizing vertebrate, Oikos, vol. 119, no. 7, pp. 1156-1160.

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Title Insights from the eco-physiological book of records : Bewick's swans outperform the canonical intake-maximizing vertebrate
Author(s) Klaassen, Marcel
Hangelbroek, Helen H.
de Boer, Thijs
Nolet, Bart A.
Journal name Oikos
Volume number 119
Issue number 7
Start page 1156
End page 1160
Publisher Wiley - Blackwell Publishing Inc
Place of publication Malden, Mass.
Publication date 2010-07
ISSN 0030-1299
1600-0706
Summary During periods of high energy demand an animal may be constrained by a physiological maximum to its energy intake rate. Predictions by allometric equations describing this maximum for endotherms were significantly surpassed during a few recent laboratory experiments on birds and mammals, being given access to food 24 h day-1. How relevant this is in the field remains to be assessed. We predicted that Bewick’s swans Cygnus columbianus bewickii might surpass this maximum during stopover on their migration. We determined intake rate by measuring initial and final biomass density, and dividing the biomass difference by the feeding time required to reach this difference. This feeding time was given by the functional response. After conversion to daily energy intake rates, these exceeded the previously assumed maximum on two of the three stopover sites studied. The exception was a stopover site where daily foraging time was limited by the tidal cycle. Our study confirms that intake rates may exceed the formerly generally supposed maximum under natural conditions when foraging is possible day and night.
Notes Article first published online 16 Feb 2010
Language eng
Field of Research 060203 Ecological Physiology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Oikos
Persistent URL http://hdl.handle.net/10536/DRO/DU:30034450

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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