Comparative Biochemistry and Physiology - Part A: Molecular &
Integrative Physiology 1. 1. Seasonal differences in metabolic
and water loss rates were examined in three related species of
grasshoppers collected from shrub-steppe communities in Utah:
Arphia conspersa, A. pseudonietana and 2. 2 cohorts of
Trimerotropis pallidipennis. 2. No significant differences (P =
0.05) in metabolic rates were observed between seasons (early vs
late), between genera (Arphia vs Trimerotropis) nor among
species. 3. 3. Early season (spring) grasshoppers had a higher
(but non-significant) mean water loss rate (±X ± SD in
mg.g−1-hr−1) (4.81 ± 1.53) than late season (summer)
grasshoppers (4.43 ± 1.43). 4. 4. Among species, early season A.
conspersa had a significantly higher water loss rate (5.22 ±
1.76) under similar conditions than late season A. pseudonietana
(3.67 ± 1.22), but early season T. pallidipennis had a
significantly lower water loss rate (4.40 ± 1.17) than the late
season generation (5.32 ± 1.12). 5. 5. Because of v