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How accurately can we estimate energetic costs in a marine top predator, the king penguin?
- Source :
- Zoology, Zoology, Elsevier, 2007, 110, pp.81-92. ⟨10.1016/j.zool.2006.09.001⟩, University of Roehampton-PURE, ResearcherID
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- King penguins (Aptenodytes patagonicus) are one of the greatest consumers of marine resources. However, while their influence on the marine ecosystem is likely to be significant, only an accurate knowledge of their energy demands will indicate their true food requirements. Energy consumption has been estimated for many marine species using the heart rate–rate of oxygen consumption ( f H – V ˙ O 2 ) technique, and the technique has been applied successfully to answer eco-physiological questions. However, previous studies on the energetics of king penguins, based on developing or applying this technique, have raised a number of issues about the degree of validity of the technique for this species. These include the predictive validity of the present f H – V ˙ O 2 equations across different seasons and individuals and during different modes of locomotion. In many cases, these issues also apply to other species for which the f H – V ˙ O 2 technique has been applied. In the present study, the accuracy of three prediction equations for king penguins was investigated based on validity studies and on estimates of V ˙ O 2 from published, field fH data. The major conclusions from the present study are: (1) in contrast to that for walking, the f H – V ˙ O 2 relationship for swimming king penguins is not affected by body mass; (2) prediction equation (1), log ( V ˙ O 2 ) = - 0.279 + 1.24 log ( f H ) + 0.0237 t - 0.0157 log ( f H ) t , derived in a previous study, is the most suitable equation presently available for estimating V ˙ O 2 in king penguins for all locomotory and nutritional states. A number of possible problems associated with producing an f H – V ˙ O 2 relationship are discussed in the present study. Finally, a statistical method to include easy-to-measure morphometric characteristics, which may improve the accuracy of f H – V ˙ O 2 prediction equations, is explained.
- Subjects :
- 0106 biological sciences
030310 physiology
Statistics as Topic
010603 evolutionary biology
01 natural sciences
Marine species
03 medical and health sciences
Indian Ocean Islands
Statistics
heart rate
Animals
14. Life underwater
aptenodytes patagonicus
Apex predator
0303 health sciences
Energy demand
energy demand
Degree (graph theory)
biology
Ecology
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]
Energetics
biology.organism_classification
Spheniscidae
oxygen consumption
Aptenodytes patagonicus
marine resources
Animal Science and Zoology
Energy Metabolism
Locomotion
Subjects
Details
- ISSN :
- 09442006
- Volume :
- 110
- Database :
- OpenAIRE
- Journal :
- Zoology
- Accession number :
- edsair.doi.dedup.....98c090c8b4d7220678415eaa437addec