P.H. Vigliano David A. Beauchamp D. Milano 2017 <p><span>Body mass and temperature are primary determinants of metabolic rate in ectothermic animals. Oxygen consumption of post-larval </span><i>Galaxias maculatus</i><span> was measured in respirometry trials under different temperatures (5–21°C) and varying body masses (0.1–&gt;1.5 g) spanning a relevant range of thermal conditions and sizes. Specific respiration rates (</span><i>R</i><span> in g O</span>₂<span> g</span>⁻¹<span> d</span>⁻¹<span>) declined as a power function of body mass and increased exponentially with temperature and was expressed as: </span><i>R </i><span>= 0.0007 * </span><i>W</i> ^−0.31<span> * </span><i>e</i> ^{0.13 * <i>T</i>}<span>. The ability of this model to predict specific respiration rate was evaluated by comparing observed values with those predicted by the model. Our findings suggest that the respiration rate of </span><i>G. maculatus</i><span> is the result of multiple interactive processes (intrinsic and extrinsic factors) that modulate each other in ‘meta-mechanistic’ ways; this would help to explain the species’ ability to undergo the complex ontogenetic habitat shifts observed in the lakes of the Andean Patagonic range.</span></p> application/pdf 10.1080/00288330.2016.1231127 en The Royal Society of New Zealand Effect of body size and temperature on respiration of <i>Galaxias maculatus</i> (Pisces: Galaxiidae) article