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The Effects of Enforced Activity On Ventilation, Circulation and Blood Acid-Base Balance in the Aquatic Gill-Less Urodele, Cryptobranchus Alleganiensis ; A Comparison with the Semi-Terrestrial Anuran, Bufo Marinus

1980; The Company of Biologists; Volume: 84; Issue: 1 Linguagem: Inglês

10.1242/jeb.84.1.289

1477-9145

Robert G. Boutilier, D. G. McDonald, Daniel P. Toews,

Fish Ecology and Management Studies

ABSTRACT A combined respiratory and metabolic acidosis occurs in the arterial blood immediately following 30 min of strenuous activity in the predominantly skin-breathing urodele, Cryptobranchus alleganiensis, and in the bimodal-breathing anuran, Bufo marinus, at 25 °C, In Bufo, the bulk of the post-exercise acidosis is metabolic in origin (principally lactic acid) and recovery is complete within 4-8 h. In the salamander, a lower magnitude, longer duration, metabolic acid component and a more pronounced respiratory acidosis prolong the recovery period for up to 22 h post-exercise. It is suggested that fundamental differences between the dominant sites for gas exchange (pulmonary versus cutaneous), and thus in the control of respiratory acid-base balance, may underline the dissimilar patterns of recovery from exercise in these two species.