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Ammonotely in a passerine nectarivore: the influence of renal and post-renal modification on nitrogenous waste product excretion

Lizanne Roxburgh and Berry Pinshow^*

Mitrani Department of Desert Ecology, Jacob Blaustein Institute for Desert Research and Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boqer Campus, 84990 Israel

View larger version (17K): [in a new window]   Fig. 1. The proportion of total nitrogen voided as urate, urea and ammonia in excreted fluid samples from Palestine sunbirds. Birds were either uricotelic (when urate was the main waste product) or ammonotelic (when ammonia was the main waste product). In seven of 52 cases, birds were ammonotelic; in the remaining 45 cases, birds were uricotelic. Values are means + S.D.

View larger version (19K): [in a new window]   Fig. 2. The changes in concentration of nitrogenous waste products (in mmol nitrogen l-1) in the ureteral urine and excreted fluid of Palestine sunbirds with changes in the water intake rate. Values are means + S.D. See Tables 2 and 3 for N values. (A) Urate concentration; (B) urea concentration; (C) ammonia concentration.

View larger version (23K): [in a new window]   Fig. 3. The proportion (A) and concentration (in mmoll-1) (B) of nitrogen excreted as ammonia, urea and urate in ureteral urine and excreted fluid of Palestine sunbirds at 30 and 10 °C. Values are means + S.D. Only ammonia concentrations of excreted fluid were significantly different at the two temperatures as indicated by different letters above columns.