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Tạp chí khoa học ĐHCT
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Tạp chí quốc tế 2015
Số tạp chí 1(2015) Trang: doi:10.1111/jfb.12696
Tạp chí: Journal of Fish Biology
Liên kết:

This study investigated the hypothesis that in the Asian swamp eel Monopterus albus, an air-breathing sh from south-east Asia that uses the buccopharyngeal cavity for oxygen uptake, the upper criti- cal temperature (TU) is increased by acclimation to higher temperature, and that the increased TU is associated with improved cardiovascular and respiratory function. Monopterus albus were there- fore acclimated to 27C (current average) and 32C (current maximum temperature as well as pro- jected average within 100–200 years), and both the effect of acclimation and acute temperature incre- ments on cardiovascular and respiratory functions were investigated. Two weeks of heat acclimation increased upper tolerated temperature (T U ) by 2C from 369 ± 01C to 389 ± 01C (mean ± s.e.). Oxygen uptake (Ṁ O2) increased with acclimation temperature, accommodated by increases in both aerial and aquatic respiration. Overall, Ṁ O2 from air (Ṁ O2a) was predominant, representing 85% in 27C acclimated sh and 80% in 32C acclimated sh. Ṁ O2 increased with acute increments in temperature and this increase was entirely accommodated by an increase in air-breathing frequency and Ṁ O2a . Monopterus albus failed to upregulate stroke volume; rather, cardiac output was maintained through increased heart rate with rising temperature. Overall, acclimation of M. albus to 32C did not improve its cardiovascular and respiratory performance at higher temperatures, and cardiovascular adaptations, therefore, do not appear to contribute to the observed increase in TU

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