Use of overall dynamic body acceleration for estimating energy expenditure in cormorants Does locomotion in different media affect relationships?

AGUSTINA GÓMEZ LAICH; RORY P. WILSON; ADRIAN GLEISS; EMILY L.C.SHEPARD; FLAVIO QUINTANA

JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY

ELSEVIER SCIENCE BV

Año: 2011 vol. 399 p. 151 - 155

0022-0981

The way in which animals use and acquire energy is fundamental to their fi tness. Overall dynamic body acceleration (ODBA) has recently been suggested as a new method for the determination of energy expenditure in wild animals. Although the relationship between ODBA and energy expenditure has been calibrated using gas-respirometry, it has only been validated for animals moving in a single medium. In this work we examined whether the relationship between ODBA and energy expenditure varies between activity types and in particular, how locomotion in different media affects the regressions using the Imperial Cormorant Phalacrocorax atriceps as a model species. Regressing mean ODBA values for resting, diving and walking periods on a single graph against mean power values, the mass-speci fi c power (W kg−1 ) was related to ODBA via; Power=12.09+41.31 ODBA (r 2 =0.93). Although values for resting, walking and swimming all fell close to a single linear fit, values for flight deviated substantially from this. The different relationships found between locomotory types are discussed in terms of the muscle groups involved in each kind of behavior.