title: Assessing the validity of the accelerometry technique for estimating the energy expenditure of diving double-crested cormorants Phalacrocorax auritus.
abstract: Over the past few years, acceleration-data loggers have been used to provide calibrated proxies of energy expenditure: the accelerometry technique. Relationships between rate of oxygen consumption and a derivation of acceleration data termed "overall dynamic body acceleration" (ODBA) have now been generated for a range of species, including birds, mammals, and amphibians. In this study, we examine the utility of the accelerometry technique for estimating the energy expended by double-crested cormorants Phalacrocorax auritus to undertake a dive cycle (i.e., a dive and the subsequent pause at the surface before another dive). The results show that ODBA does not calibrate with energy expenditure in diving cormorants, where energy expenditure is calculated from measures of oxygen uptake during surface periods between dives. The possible explanations include reasons why energy expenditure may not relate to ODBA but also reasons why oxygen uptake between dives may not accurately represent energy expenditure during a dive cycle.
authors: Roehampton University, London SW15 4JD, UK. l.halsey@roehampton.ac.uk
authors: L G
authors: LG
authors: Halsey
authors: C R
authors: CR
authors: White
authors: M R
authors: MR
authors: Enstipp
authors: R P
authors: RP
authors: Wilson
authors: P J
authors: PJ
authors: Butler
authors: G R
authors: GR
authors: Martin
authors: D
authors: D
authors: Grémillet
authors: D R
authors: DR
authors: Jones
mesh_terms: D000054:Acceleration; D000818:Animals; D001717:Birds / Q000502:physiology*; D004242:Diving / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000379:methods; D005082:Physical Exertion / Q000502:physiology; D015203:Reproducibility of Results