Dynamic changes in flow rate and composition of urine during the post-bloodmeal diuresis in Aedes aegypti (L.)

James C. Williams, Henry H. Hagedorn, Klaus W. Beyenbach

Research output: Contribution to journalArticle

92 Scopus citations

Abstract

1. The urine of blood-fed mosquitos was collected and analyzed for elemental composition and osmolality. 2. Peak rates of urine flow averaged 4.9 droplets/min at 6 min following the beginning of the bloodmeal; peak flow urine contained, in mM, Na 178, K 4, and Cl 132, and the urine was approximately isosmotic to hemolymph. 3. As urine flow rates fell, the [Na] of the urine decreased and the [K] increased. Urine osmolality declined, measuring less than 100 mOsm/kg in some samples, as compared to 354 mOsm/kg measured in pre-bloodmeal hemolymph. 4. When urine flow rates had fallen to less than 10% of peak flow rates, urine again became approximately isosmotic to hemolymph, still containing Na and K as the principal cations. 5. Approximately 40% each of the water, Na and Cl contained in the plasma fraction of the bloodmeal was excreted during the 1-2h period following the bloodmeal. This excretion represents only 20-30% of the total loads ingested in the bloodmeal. 6. The data are consistent with dynamic changes in the functioning of both the Malpighian tubules and hindgut during the post-bloodmeal diuresis.

Original languageEnglish (US)
Pages (from-to)257-265
Number of pages9
JournalJournal of Comparative Physiology ■ B
Volume153
Issue number2
DOIs
StatePublished - Jun 1 1983
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry
  • Physiology
  • Animal Science and Zoology
  • Endocrinology

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