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The Journal of Experimental Biology 205, 3945-3954 (2002)
Copyright © 2002 The Company of Biologists Limited

Oxygen uptake during post dive recovery in a diving bird Aythya fuligula: implications for optimal foraging models

Roland Parkes1, Lewis G. Halsey1,*, Anthony J. Woakes1, Roger L. Holder2 and Patrick J. Butler1

1 School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
2 School of Mathematics and Statistics, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

* Author for correspondence (e-mail: lgh013{at}bham.ac.uk)

Accepted 16 September 2002

The rate of oxygen uptake at the surface between dives was measured for four tufted ducks, Aythya fuligula, during bouts of foraging dives to a depth of 1.8 m. The ducks surfaced into a respirometer box after each dive so that the rate of oxygen uptake (O2) could be measured. O2 decreased over time at the surface and there was a particularly rapid phase of oxygen uptake for approximately the first 3s. The specific shape of the oxygen uptake curve is dependent upon the duration of the preceding dive. The uptake curve after longer dives was significantly steeper during the first 3s at the surface than after shorter dives, although O2 after the first 3s was not significantly different between these two dive duration bins. Thus, the mean total oxygen uptake (VO2) was higher after surface periods following longer dives. Due to the high O2 during the initial part of the surface period, the curve associated with longer dives was statistically biphasic, with the point of inflection at 3.3s. The curve for shorter dives was not statistically biphasic. The birds may increase their respiratory frequency during the first 3s after longer dives, producing the increased O2, which would enable the birds to resaturate their oxygen stores more rapidly in response to the increased oxygen depletion of the longer submergence time.

Key words: tufted duck, Aythya fuligula, diving, oxygen uptake, optimal foraging, model


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