Summary
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1.
The urine of blood-fed mosquitos was collected and analyzed for elemental composition and osmolality.
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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.
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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.
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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.
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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.
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6.
The data are consistent with dynamic changes in the functioning of both the Malpighian tubules and hindgut during the post-bloodmeal diuresis.
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Williams, J.C., Hagedorn, H.H. & Beyenbach, K.W. Dynamic changes in flow rate and composition of urine during the post-bloodmeal diuresis inAedes aegypti (L.). J Comp Physiol B 153, 257–265 (1983). https://doi.org/10.1007/BF00689629
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DOI: https://doi.org/10.1007/BF00689629