Abstract
1. 1. Seasonal variations of hemolymph ion concentration and hemolymph osmotic pressure were examined in two species of benthic macroinvertebrates each in two lakes in central Oklahoma. 2. 2. Variations in ion concentration among stations were not significant in either lake, although two stations in Ham's Lake were destratified in summer by pumping while one station remained stratified. 3. 3. Mean month concentrations of Na + ions in the hemolymph of Chironomus tentants ranged from 73 to 120 mM. while the maximum mean for K + was 8 mM. Values for Cl − ions were about one half the levels of Na + Osmotic pressure ranged from 0.25 to 0.43—Δ° C. 4. 4. The ionic composition of the hemolymph was lower in Chironomus riparius in Ham's Lake in spring and fall than in summer. No seasonal trend was observed for C. tentans in Arbuckle Lake and the trends for Chaoborus punctipennis were opposite in Arbuckle and Ham's lakes. 5. 5. The correlation coefficients between Na + or Cl − ions in the hemolymph and osmotic pressure were all significant. 6. 6. In laboratory experiments, the hemolymph ion concentrations of C. riparius and C. punctipennis increased with temperature and salinity and decreased with dissolved oxygen concentration (DO). In a factorial design, the interactions between DO × salinity and DO × temperature were significant.
Published Version
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