Estimating energetics in cetaceans from respiratory frequency : why we need to understand physiology Fahlman, Andreas van der Hoop, Julie Moore, Michael J. Levine, Gregg Rocho-Levine, Julie Brodsky, Micah 2016-05-23T18:37:09Z 2016-05-23T18:37:09Z 2016-04-15
dc.description © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biology Open 5 (2016): 436-442, doi:10.1242/bio.017251. en_US
dc.description.abstract The accurate estimation of field metabolic rates (FMR) in wild animals is a key component of bioenergetic models, and is important for understanding the routine limitations for survival as well as individual responses to disturbances or environmental changes. Several methods have been used to estimate FMR, including accelerometer-derived activity budgets, isotope dilution techniques, and proxies from heart rate. Counting the number of breaths is another method used to assess FMR in cetaceans, which is attractive in its simplicity and the ability to measure respiration frequency from visual cues or data loggers. This method hinges on the assumption that over time a constant tidal volume (VT) and O2 exchange fraction (ΔO2) can be used to predict FMR. To test whether this method of estimating FMR is valid, we measured breath-by-breath tidal volumes and expired O2 levels of bottlenose dolphins, and computed the O2 consumption rate (V̇O2) before and after a pre-determined duration of exercise. The measured V̇O2 was compared with three methods to estimate FMR. Each method to estimate V̇O2 included variable VT and/or ΔO2. Two assumption-based methods overestimated V̇O2 by 216-501%. Once the temporal changes in cardio-respiratory physiology, such as variation in VT and ΔO2, were taken into account, pre-exercise resting V̇O2 was predicted to within 2%, and post-exercise V̇O2 was overestimated by 12%. Our data show that a better understanding of cardiorespiratory physiology significantly improves the ability to estimate metabolic rate from respiratory frequency, and further emphasizes the importance of eco-physiology for conservation management efforts. en_US
dc.description.sponsorship Funding for this project was provided by the Office of Naval Research [ONR YIP Award # N000141410563]. M.J.M. received funding from National Oceanographic Partnership Program [9N00014-11-1-0113]. en_US
dc.identifier.citation Biology Open 5 (2016): 436-442 en_US
dc.identifier.doi 10.1242/bio.017251
dc.language.iso en_US en_US
dc.publisher The Company of Biologists en_US
dc.rights Attribution 3.0 Unported *
dc.subject Field metabolic rate en_US
dc.subject Marine mammal en_US
dc.subject Oxygen consumption rate en_US
dc.subject Exercise en_US
dc.subject Recovery en_US
dc.subject Eco-physiology en_US
dc.subject Energy budget en_US
dc.subject Oxygen debt en_US
dc.title Estimating energetics in cetaceans from respiratory frequency : why we need to understand physiology en_US
dc.type Article en_US
dspace.entity.type Publication
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