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Auteur Wang, T.; Lefevre, S.; Iversen, N.K.; Findorf, I.; Buchanan, R.; McKenzie, D.J.
Titre Anaemia only causes a small reduction in the upper critical temperature of sea bass: is oxygen delivery the limiting factor for tolerance of acute warming in fishes? Type Article scientifique
Année 2014 Publication Revue Abrégée Journal of Experimental Biology
Volume 217 Numéro 24 Pages 4275-4278
Mots-Clés aerobic scope; cardiac-performance; Cardiovascular; climate-change; dicentrarchus-labrax; ecology; exp. biol. 216; fish; Haematocrit; metabolism; Oxygen transport; phenylhydrazine-induced anemia; thermal tolerance; trout
Résumé To address how the capacity for oxygen transport influences tolerance of acute warming in fishes, we investigated whether a reduction in haematocrit, by means of intra-peritoneal injection of the haemolytic agent phenylhydrazine, lowered the upper critical temperature of sea bass. A reduction in haematocrit from 42 +/- 2% to 20 +/- 3% (mean +/- s.e.m.) caused a significant but minor reduction in upper critical temperature, from 35.8 +/- 0.1 to 35.1 +/- 0.2 degrees C, with no correlation between individual values for haematocrit and upper thermal limit. Anaemia did not influence the rise in oxygen uptake between 25 and 33 degrees C, because the anaemic fish were able to compensate for reduced blood oxygen carrying capacity with a significant increase in cardiac output. Therefore, in sea bass the upper critical temperature, at which they lost equilibrium, was not determined by an inability of the cardio-respiratory system to meet the thermal acceleration of metabolic demands.
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Notes <p>ISI Document Delivery No.: AW7BT<br/>Times Cited: 1<br/>Cited Reference Count: 44<br/>Wang, Tobias Lefevre, Sjannie Iversen, Nina K. Findorf, Inge Buchanan, Rasmus McKenzie, David J.<br/>Centre National de la Recherche Scientifique (CNRS); Danish Research Council; Region Languedoc-Roussillon (RLR); Ambassade de France in Copenhagen; Universite Montpellier 2<br/>This research was supported by the Centre National de la Recherche Scientifique (CNRS), the Danish Research Council, The Ambassade de France in Copenhagen and Universite Montpellier 2. T.W. was supported by a fellowship from Region Languedoc-Roussillon (RLR) as a visiting professor at Universite Montpellier 2. I.F. and N.K.I. were supported by a student grant from The Ambassade de France in Copenhagen.<br/>Company of biologists ltd<br/>Cambridge</p> Approuvé pas de
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