Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate
© 2014. Published by the Company of Biologists Ltd.The measurement of 86Rb turnover recently has been suggested as a useful method for measuring field metabolic rate in small animals. We investigated a proposed mechanism of 86Rb turnover, its analogy to K+, by comparing the turnover of 86Rb in a mod...
| Main Authors: | , , |
|---|---|
| Format: | Journal Article |
| Published: |
The Company of Biologists Ltd.
2014
|
| Online Access: | http://hdl.handle.net/20.500.11937/52775 |
| _version_ | 1848759008070991872 |
|---|---|
| author | Tomlinson, Sean Mathialagan, P. Maloney, S. |
| author_facet | Tomlinson, Sean Mathialagan, P. Maloney, S. |
| author_sort | Tomlinson, Sean |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2014. Published by the Company of Biologists Ltd.The measurement of 86Rb turnover recently has been suggested as a useful method for measuring field metabolic rate in small animals. We investigated a proposed mechanism of 86Rb turnover, its analogy to K+, by comparing the turnover of 86Rb in a model insect, the rhinoceros beetle Xylotrupes gideon, fed a diet of plum jam or plum jam enriched with K+ or Rb+. The turnover of 86Rb in the beetles on the K+ and the Rb+ diets was higher than that for beetles on the jam diet (F2,311=32.4; P=1.58×10-13). We also exposed the beetles to different ambient temperatures to induce differences in metabolic rate (VCO2) while feeding them the jam and K+ diets. VCO2 was higher at higher ambient temperature (Ta) for both jam (F1,11=14.56; P=0.003) and K+ (F1,8=15.39; P=0.004) dietary groups, and the turnover of 86Rb was higher at higher Tafor both jam (F1,11=10.80; P=0.007) and K+ (F1,8=12.34; P=0.008) dietary groups. There was a significant relationship between 86Rb turnover and VCO2 for both the jam (F1,11=35.00; P=1.0×10-3) and the K+ (F1,8=64.33; P=4.3×10-5) diets, but the relationship differed between the diets (F1,19=14.07; P=0.001), with a higher 86Rb turnover in beetles on the K+-enriched than on the jam diet at all Ta. We conclude that 86Rb turnover is related to K+ metabolism, and that this is the mechanism of the relationship between 86Rb turnover and VCO2. Studies relating 86Rb turnover to VCO2 should maintain dietary [K+] as close as possible to that of natural diets for the most accurate calibrations for free-ranging animals. |
| first_indexed | 2025-11-14T09:53:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-52775 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:53:03Z |
| publishDate | 2014 |
| publisher | The Company of Biologists Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-527752023-08-02T06:39:09Z Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate Tomlinson, Sean Mathialagan, P. Maloney, S. © 2014. Published by the Company of Biologists Ltd.The measurement of 86Rb turnover recently has been suggested as a useful method for measuring field metabolic rate in small animals. We investigated a proposed mechanism of 86Rb turnover, its analogy to K+, by comparing the turnover of 86Rb in a model insect, the rhinoceros beetle Xylotrupes gideon, fed a diet of plum jam or plum jam enriched with K+ or Rb+. The turnover of 86Rb in the beetles on the K+ and the Rb+ diets was higher than that for beetles on the jam diet (F2,311=32.4; P=1.58×10-13). We also exposed the beetles to different ambient temperatures to induce differences in metabolic rate (VCO2) while feeding them the jam and K+ diets. VCO2 was higher at higher ambient temperature (Ta) for both jam (F1,11=14.56; P=0.003) and K+ (F1,8=15.39; P=0.004) dietary groups, and the turnover of 86Rb was higher at higher Tafor both jam (F1,11=10.80; P=0.007) and K+ (F1,8=12.34; P=0.008) dietary groups. There was a significant relationship between 86Rb turnover and VCO2 for both the jam (F1,11=35.00; P=1.0×10-3) and the K+ (F1,8=64.33; P=4.3×10-5) diets, but the relationship differed between the diets (F1,19=14.07; P=0.001), with a higher 86Rb turnover in beetles on the K+-enriched than on the jam diet at all Ta. We conclude that 86Rb turnover is related to K+ metabolism, and that this is the mechanism of the relationship between 86Rb turnover and VCO2. Studies relating 86Rb turnover to VCO2 should maintain dietary [K+] as close as possible to that of natural diets for the most accurate calibrations for free-ranging animals. 2014 Journal Article http://hdl.handle.net/20.500.11937/52775 10.1242/jeb.096222 The Company of Biologists Ltd. unknown |
| spellingShingle | Tomlinson, Sean Mathialagan, P. Maloney, S. Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate |
| title | Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate |
| title_full | Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate |
| title_fullStr | Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate |
| title_full_unstemmed | Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate |
| title_short | Special K: Testing the potassium link between radioactive rubidium (86Rb) turnover and metabolic rate |
| title_sort | special k: testing the potassium link between radioactive rubidium (86rb) turnover and metabolic rate |
| url | http://hdl.handle.net/20.500.11937/52775 |