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The effects of temperature on the cardio-respiratory function of the neotropical fish Piaractus mesopotamicus by Lucia H. Aguiar; Ana L. Kalinin; F.Tadeu Rantin is a Environmental Science article available to read on EtoBox.

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Piaractus mesopotamicus were acclimated to 351C (group I) and 151C (group II). In group I, temperature was decreased from 351C to 151C, followed by a return to 351C, while in group II, temperature rose to 351C and returned to 151C. For each temperature, oxygen uptake ( ' VO 2 ), ventilatory parameters ( ' , oxygen extraction (EO 2 ) and ECGs were obtained. Group II developed a higher ' VO 2 than group I, and the hysteresis presented by group I may characterize the attempt to reestablish the respiratory homeostasis. The V T remained almost constant and the increases in ' V G were achieved by larger increases in f R : Group II presented significantly higher f H values between 301C and 201C when compared to the warm-acclimated group. Neither thermal acclimation nor changes in temperature affected the QRS and the T wave amplitudes. The increases of QRS and T wave durations, A APD and V APD in group I suggest that low temperatures delayed the ionic diffusion within the sarcolemma and, thereby, the final depolarization and repolarization.

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Author

Lucia H. Aguiar; Ana L. Kalinin; F.Tadeu Rantin

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0306-4565)

Published

2002

Language

EN

Field

Environmental Science (Life Sciences)