The effect of acclimation on the acid-base status of pigeons exposed to high ambient temperatures
| Autor: | Jacob Marder |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Alkalosis
Physiology Oxygene Acid–base homeostasis medicine.disease Biochemistry Acclimatization chemistry.chemical_compound Animal science chemistry Heat acclimation Hypocapnia Carbon dioxide Respiration medicine General Agricultural and Biological Sciences computer Developmental Biology computer.programming_language |
| Zdroj: | Journal of Thermal Biology. 15:217-221 |
| ISSN: | 0306-4565 |
| DOI: | 10.1016/0306-4565(90)90005-3 |
| Popis: | Arterial pH, PCO 2 (P a CO 2 ), plasma bicarbonate [HCO 3 − and respiratory frequency were measured in pigeons exposed to ambient temperatures ( T a S) of 30–60°C. Acclimated, nonpanting birds regulated acid-base balance at normal levels, when exposed to T a s) between 30 and 53°C T a . At higher T a s (55–60°C), both nonpanting and panting acclimated pigeons regulated pH at normal levels, 7.544 ± 0.011 (SD) and 7.531 ± 0.022 (SD), respectively, accompanied by a slight hypocapnia, 24.8 ± 4.0 Torr and 23.8 ± 2.49 Torr (P a CO 2 ), respectively. Nonacclimated birds, exposed to 50°C T a , endured a severe hypocapnia (P a CO 2 of 9.1 ± 2.52 Torr) and alkalosis (pH of 7.702 ± 0.048). Thirteen exposures to > 50°C T a , 4–6 h a day, resulted in a significant improvement in the capacity of the panting pigeon to maintain an almost normal acid-base balance, i.e. actual and standard [HCO 3 − of 22.6 ± 1.22 and 25.7 ± 1.10 mM/l, respectively, and only a slight hypocapnia (P a CO 2 of 23.6 ± 3.9 Torr) and alkalosis (pH of 7.589). The suggestion that acclimation to high T a s (50–60°C) is needed for fine adjustment between the competing needs for heat dissipation, pulmonary gas exchange, and acid-base regulation in the heat-exposed pigeon is discussed. |
| Databáze: | OpenAIRE |
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