Components of evaporative water loss in the desert tenebrionid beetles, Eleodes armata and Cryptoglossa verrucosa
Water loss in Eleodes armata and Cryptoglossa verrucosa increased with increasing temperature and decreasing vapor activity (a/sub v/). Rates of evaporative water loss were always about 4 times greater in E. armata than in C. verrucosa at the different temperatures and 0.0 a/sub v/, while as a/sub v/ increased the ratio of E. armata loss to C. verrucosa decreased from 4 at 0.0 a/sub v/ to about 2 at 0.94 a/sub v/. A method for determining mesothoracic spiracular, sub-elytral abdominal, and cuticular water loss rates was described and validated for living E. armata. Sub-elytral abdominal water loss through the caudal opening was 8.0 mg H/sub 2/O (g.d)/sup -1/, meso-thoracic spiracular water loss was approximately 7.9 mg H/sub 2/O (g.d)/sup -1/, and cuticular loss was 26.2 mg H/sub 2/O (g.d)/sup -1/ at 30 C and 0.0 a/sub v/. Evaporative water loss was shown to have two unidirectional components, efflux and influx, for both beetles with the use of tritiated water (H/sup 3/HO). Efflux was independent of a/sub v/, while influx increased linearly with a/sub v/, with both components having lower rates in C. verrucosa compared to E. armata.
- Research Organization:
- California Univ., Los Angeles (USA). Lab. of Biomedical and Environmental Sciences
- DOE Contract Number:
- AC03-76SF00012
- OSTI ID:
- 6078817
- Report Number(s):
- UCLA-12/1319; ON: DE82002963
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BEETLES
HOMEOSTASIS
WATER
ABSORPTION
EVAPORATION
HUMIDITY
SWEAT
TEMPERATURE DEPENDENCE
TRITIUM
ANIMALS
ARTHROPODS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BODY FLUIDS
COLEOPTERA
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INSECTS
INVERTEBRATES
ISOTOPES
LIGHT NUCLEI
MATERIALS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADIOISOTOPES
WASTES
YEARS LIVING RADIOISOTOPES
551001* - Physiological Systems- Tracer Techniques