PATTERNS OF CUTANEOUS WATER EVAPORATION BY AUSTRALIAN PIGEONS
äºIsrael Journal of Ecology and EvolutionSearch for other papers by Jacob Marder in
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We examined thermoregulation and cutaneous evaporative cooling by heat-stressed desert columbids (diamond dove, flock bronzewing, rock pigeon, and spinifex pigeon), temperate-zone columbids (common and brush bronzewing, and crested pigeon), and rainforest columbids (wonga pigeon, Luzon bleeding heart, and emerald dove). Body temperature at a Ta of 47 ºC was lower for desert birds (43.3 ºC) than for temperate-zone birds (43.6 ºC) and rainforest birds (44.4 ºC). Body-skin temperature difference (DT) was only 0.2 ºC for rainforest species; it was significantly higher at 0.4 ºC for temperate-zone pigeons, and significantly higher again at 0.9 ºC for arid-zone birds. Cutaneous water evaporation (CWE) was 2.1 mg H2O cm-2 h-1 for rainforest species; it was significantly higher at 5.6 mg H2O cm-2 h-1 for temperate-zone birds, and significantly higher again at 13.5 mg H2O cm-2 h-1 for arid-zone pigeons. CWE of young wonga and bleeding heart pigeons was similar to that of adults, but was very high for young birds of other species. Comparisons at 42 ºC were very similar. Cutaneous evaporative cooling (CEC), which was suggested to be an evolutionarily recent mechanism compared to panting, is not effective for the three arboreal rainforest pigeons and probably did not occur in ancestral columbids that were presumably arboreal. We suggest that effective CEC evolved in altricial hatchlings of pigeons in a temperate-zone climate as a cooling mechanism, and has achieved its highest effectiveness in both young and adult desert pigeons.
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| å ¨é¨æé´ | è¿å»ä¸å¹´ | è¿å»30天 | |
|---|---|---|---|
| æè¦æµè§æ¬¡æ° | 171 | 32 | 8 |
| å ¨ææµè§æ¬¡æ° | 21 | 0 | 0 |
| PDFä¸è½½æ¬¡æ° | 16 | 0 | 0 |
PATTERNS OF CUTANEOUS WATER EVAPORATION BY AUSTRALIAN PIGEONS
äºIsrael Journal of Ecology and EvolutionSearch for other papers by Jacob Marder in
Current site
Google Scholar
PubMed
Search for other papers by Philip C. Withers in
Current site
Google Scholar
PubMed
Search for other papers by Robert G. Philpot in
Current site
Google Scholar
PubMed
We examined thermoregulation and cutaneous evaporative cooling by heat-stressed desert columbids (diamond dove, flock bronzewing, rock pigeon, and spinifex pigeon), temperate-zone columbids (common and brush bronzewing, and crested pigeon), and rainforest columbids (wonga pigeon, Luzon bleeding heart, and emerald dove). Body temperature at a Ta of 47 ºC was lower for desert birds (43.3 ºC) than for temperate-zone birds (43.6 ºC) and rainforest birds (44.4 ºC). Body-skin temperature difference (DT) was only 0.2 ºC for rainforest species; it was significantly higher at 0.4 ºC for temperate-zone pigeons, and significantly higher again at 0.9 ºC for arid-zone birds. Cutaneous water evaporation (CWE) was 2.1 mg H2O cm-2 h-1 for rainforest species; it was significantly higher at 5.6 mg H2O cm-2 h-1 for temperate-zone birds, and significantly higher again at 13.5 mg H2O cm-2 h-1 for arid-zone pigeons. CWE of young wonga and bleeding heart pigeons was similar to that of adults, but was very high for young birds of other species. Comparisons at 42 ºC were very similar. Cutaneous evaporative cooling (CEC), which was suggested to be an evolutionarily recent mechanism compared to panting, is not effective for the three arboreal rainforest pigeons and probably did not occur in ancestral columbids that were presumably arboreal. We suggest that effective CEC evolved in altricial hatchlings of pigeons in a temperate-zone climate as a cooling mechanism, and has achieved its highest effectiveness in both young and adult desert pigeons.
| å ¨é¨æé´ | è¿å»ä¸å¹´ | è¿å»30天 | |
|---|---|---|---|
| æè¦æµè§æ¬¡æ° | 171 | 32 | 8 |
| å ¨ææµè§æ¬¡æ° | 21 | 0 | 0 |
| PDFä¸è½½æ¬¡æ° | 16 | 0 | 0 |
