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| Mckenzie, David; Belao, Thiago C.; Killen, Shaun S.; Rantin, F. Tadeu. |
| The African sharptooth catfish Clarias gariepinus has bimodal respiration, it has a suprabranchial air-breathing organ alongside substantial gills. We used automated bimodal respirometry to reveal that undisturbed juvenile catfish (N=29) breathed air continuously in normoxia, with a marked diurnal cycle. Air breathing and routine metabolic rate (RMR) increased in darkness when, in the wild, this nocturnal predator forages. Aquatic hypoxia (20% air saturation) greatly increased overall reliance on air breathing. We investigated whether two measures of risk taking to breathe air, namely absolute rates of aerial O-2 uptake ((M) over dotO(2), air) and the percentage of RMR obtained from air (% (M) over dotO(2), air), were influenced by individual standard... |
| Tipo: Text |
Palavras-chave: Bimodal respiration; Energy metabolism; Hypoxia; Personality; Respiratory partitioning; Risk-taking. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00626/73822/73663.pdf |
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