Increased temperature tolerance of the air-breathing Asian swamp eel Monopterus albus after high-temperature acclimation is not explained by improved cardiorespiratory performance

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Increased temperature tolerance of the air-breathing Asian swamp eel Monopterus albus after high-temperature acclimation is not explained by improved cardiorespiratory performance

S. Lefevre [et al.] - Nama Orang;

This study investigated the hypothesis that in the Asian swamp eel Monopterus albus, an air-breathing fish from south-east Asia that uses the buccopharyngeal cavity for oxygen uptake, the upper critical 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 therefore acclimated to 27∘ C (current average) and 32∘ C (current maximum temperature as well as projected average within 100–200 years), and both the effect of acclimation and acute temperature increments on cardiovascular and respiratory functions were investigated. Two weeks of heat acclimation
increased upper tolerated temperature (TU) by 2∘ C from 36⋅9±0⋅1∘ C to 38⋅9±0⋅1∘ C (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 27∘ C acclimated fish and 80% in 32∘ C acclimated fish. Ṁ O2 increased with acute increments in temperature and this increase was entirely accommodated by an increase in air-breathing frequency andṀ O2a.Monopterus albus failed to upregulate stroke volume; rather, cardiac output wasmaintained through increased heart rate with rising temperature. Overall, acclimation of M. albus to 32∘ C 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.

Key words: blood flow; blood pressure; climate change; heart rate; respiratory partitioning;respirometry.

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Judul Seri: Journal of Fish Biology
No. Panggil: -
Penerbit: : The Fisheries Society of the British Isles., 2016
Deskripsi Fisik: Journal of Fish Biology (2016) 88, 418–432
Bahasa: Indonesia
ISBN/ISSN: -
Klasifikasi: -
Tipe Isi: -
Tipe Media: -
Tipe Pembawa: -
Edisi: -
Subjek: Agriculture
Info Detail Spesifik: -
Pernyataan Tanggungjawab: Wati/Agus

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FULL TEXT:Increased temperature tolerance of the air-breathing Asian swamp eel Monopterus albus after high-temperature acclimation is not explained by improved cardiorespiratory performance

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