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Larvae of the disease vector mosquito,  Aedes aegypti  (L.) readily develop in ammonia rich sewage in the British Virgin Islands. To understand how the larvae survive in ammonia levels that are lethal to most animals, an examination of ammonia excretory physiology in larvae collected from septic-water and freshwater was carried out.  A. aegypti  larvae were found to be remarkably plastic in dealing with high external ammonia through the modulation of NH 4  +  excretion at the anal papillae, measured using the scanning ion-selective electrode technique (SIET), and NH 4  +  secretion in the primary urine by the Malpighian tubules when developing in septicwater. Ammonia transporters, Amt and Rh proteins, are expressed in ionoregulatory and excretory organs, with increases in Rh protein, Na + -K + -ATPase, and V-type-H + -ATPase expression observed in the Malpighian tubules, hindgut, and anal papillae in septic-water larvae. A comparative approach using laboratory  A. aegypti  larvae reared in high ammonia septic-water revealed similar responses to collected  A. aegypti  with regard to altered ammonia secretion and hemolymph ion composition. Results suggest that the observed alterations in excretory physiology of larvae developing in septic-water is a consequence of the high ammonia levels and that  A. aegypti  larvae may rely on ammonia transporting proteins coupled to active transport to survive in septic-water.

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Development of Aedes aegypti (Diptera: Culicidae) mosquito larvae in high ammonia sewage in septic tanks causes alterations in ammonia excretion, ammonia transporter expression, and osmoregulation