Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule?
It is a central paradigm of comparative physiology that the effect of humidity on evaporative water loss (EWL) is determined for most mammals and birds, in and below thermoneutrality, essentially by physics and is not under physiological regulation. Fick's law predicts that EWL should be invers...
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| Format: | Journal Article |
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Royal Society of London
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/23080 |
| _version_ | 1848751050264150016 |
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| author | Withers, P. Cooper, Christine |
| author_facet | Withers, P. Cooper, Christine |
| author_sort | Withers, P. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | It is a central paradigm of comparative physiology that the effect of humidity on evaporative water loss (EWL) is determined for most mammals and birds, in and below thermoneutrality, essentially by physics and is not under physiological regulation. Fick's law predicts that EWL should be inversely proportional to ambient relative humidity (RH) and linearly proportional to the water vapour pressure deficit (Δwvp) between animal and air. However, we show here for a small dasyurid marsupial, the little kaluta (Dasykaluta rosamondae), that EWL is essentially independent of RH (and Δwvp) at low RH (as are metabolic rate and thermal conductance). These results suggest regulation of a constant EWL independent of RH, a hitherto unappreciated capacity of endothermic vertebrates. Independence of EWL from RH conserves water and heat at low RH, and avoids physiological adjustments to changes in evaporative heat loss such as thermoregulation. Re-evaluation of previously published data for mammals and birds suggests that a lesser dependence of EWL on RH is observed more commonly than previously thought, suggesting that physiological independence of EWL of RH is not just an unusual capacity of a few species, such as the little kaluta, but a more general capability of many mammals and birds. |
| first_indexed | 2025-11-14T07:46:33Z |
| format | Journal Article |
| id | curtin-20.500.11937-23080 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:46:33Z |
| publishDate | 2014 |
| publisher | Royal Society of London |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-230802017-09-13T13:57:03Z Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? Withers, P. Cooper, Christine It is a central paradigm of comparative physiology that the effect of humidity on evaporative water loss (EWL) is determined for most mammals and birds, in and below thermoneutrality, essentially by physics and is not under physiological regulation. Fick's law predicts that EWL should be inversely proportional to ambient relative humidity (RH) and linearly proportional to the water vapour pressure deficit (Δwvp) between animal and air. However, we show here for a small dasyurid marsupial, the little kaluta (Dasykaluta rosamondae), that EWL is essentially independent of RH (and Δwvp) at low RH (as are metabolic rate and thermal conductance). These results suggest regulation of a constant EWL independent of RH, a hitherto unappreciated capacity of endothermic vertebrates. Independence of EWL from RH conserves water and heat at low RH, and avoids physiological adjustments to changes in evaporative heat loss such as thermoregulation. Re-evaluation of previously published data for mammals and birds suggests that a lesser dependence of EWL on RH is observed more commonly than previously thought, suggesting that physiological independence of EWL of RH is not just an unusual capacity of a few species, such as the little kaluta, but a more general capability of many mammals and birds. 2014 Journal Article http://hdl.handle.net/20.500.11937/23080 10.1098/rspb.2014.0149 Royal Society of London fulltext |
| spellingShingle | Withers, P. Cooper, Christine Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? |
| title | Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? |
| title_full | Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? |
| title_fullStr | Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? |
| title_full_unstemmed | Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? |
| title_short | Physiological regulation of evaporative water loss in endotherms: Is the little red kaluta (Dasykaluta rosamondae) an exception or the rule? |
| title_sort | physiological regulation of evaporative water loss in endotherms: is the little red kaluta (dasykaluta rosamondae) an exception or the rule? |
| url | http://hdl.handle.net/20.500.11937/23080 |