Mean Ucrit (a), and RMR (b) for gravid and non-gravid females for each oxygen treatment. Points are mean ± SE. n = 79 (22 gravid, 57 non-gravid)

Mean Ucrit (a), and RMR (b) for gravid and non-gravid females for each oxygen treatment. Points are mean ± SE. n = 79 (22 gravid, 57 non-gravid)

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Physiological traits are key determinants of species success in any given environment. Competing metabolic demands can influence success by limiting the available scope for aerobically-demanding activities, including reproduction and dispersal. The present study investigated whether the aerobic performance of Gambusia holbrooki, one of the most inv...