The respiratory responses of an amphibious snail Pomacea lineata (spix, 1827), to temperature and oxygen tension variations
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1987-12-01
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Santos, Cristina A.Z
Penteado, Carlos H.S [UNESP]
Mendes, Erasmo G
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1. 1. The respiratory responses of Pomacea lineata to short-term (or acute) exposure to temperature and oxygen tension variations were investigated in animals acclimated to 25°C. 2. 2. The respiratory rates increased with rising temperatures; this increase was sharper between 15 and 25°C than at any other temperature interval; a tendency to a plateau in the RT curve was recorded between 25 and 35°C. 3. 3. All animals survived well to 1 hr exposure to the extreme temperatures used (5 and 40°C). 4. 4. In two different experimental approaches, the animals showed ability to regulate the respiratory rate in declining oxygen tensions, at least down to 10% (70.8 mmHg) oxygen. 5. 5. After 1 hr exposure to hypoxic conditions, P. lineata exhibited the pattern of underpayment of the oxygen debt acquired. 6. 6. Six out of ten animals survived after 40 days in anoxia (100% nitrogen). © 1987.
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Comparative Biochemistry and Physiology -- Part A: Physiology, v. 86, n. 3, p. 409-415, 1987.