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

journal contribution
posted on 01.07.2010, 00:00 authored by Marcel KlaassenMarcel Klaassen, H Hangelbroek, T de Boer, B Nolet
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.

History

Journal

Oikos

Volume

119

Issue

7

Pagination

1156 - 1160

Publisher

Wiley - Blackwell Publishing Inc

Location

Malden, Mass.

ISSN

0030-1299

eISSN

1600-0706

Language

eng

Notes

Article first published online 16 Feb 2010

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2010, Oikos