title: Allometric estimation of metabolic rate from heart rate in penguins.
abstract: Studies of the relationship between heart rate (f(H)) and rate of oxygen consumption (V(.) (O(2))), which are then used to predict field metabolic rate, frequently fail to incorporate body mass as a predictive variable. This is a potentially important omission in the study of animals whose body mass fluctuates substantially during their annual cycle. In an attempt further to improve estimates of field metabolic rate from f(H), we re-evaluated data on M(b), f(H) and V(.) (O(2)) from previous studies of macaroni penguins (Eudyptes chrysolophus) and king penguins (Aptenodytes patagonicus) and derived a new relationship to integrate these three quantities. This relationship is at least as accurate and precise as previously determined relationships. We applied this same principle to published data on 11 of the 20 recognised penguin taxa to derive a relationship to predict V(.) (O(2)) from f(H) and M(b) in penguins of any species. This result has interesting implications in terms of reducing the logistical burden in studies of field metabolic rate.
authors.affiliation: Centre for Ornithology School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. jon.green@latrobe.edu.au
authors.forename: J A
authors.initials: JA
authors.lastname: Green
authors.forename: C R
authors.initials: CR
authors.lastname: White
authors.forename: P J
authors.initials: PJ
authors.lastname: Butler
mesh_terms: D000818:Animals; D004734:Energy Metabolism / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology*; D016014:Linear Models; D010101:Oxygen Consumption / Q000502:physiology*; D011237:Predictive Value of Tests; D013045:Species Specificity; D046429:Spheniscidae / Q000502:physiology*