Abstract
AbstractKelp gulls (mean body weight of 905.3 ± 46.5 g, plasma osmolality of 316.5 ± 1.5 mOsm.kg−1, plasma Na+ of 151.3 ± 0.8 mEq.liter−1, and plasma K+ of 3.1 ± 0.2 mEq.liter−1 (means ± SE) were adapted to fresh water and had basal plasma concentrations of arginine vasotocin (AVT) and angiotensin II (AII) of 13.6 ± 1.1 pg.ml−1 and 48.1 ± 3.4 pg.ml−1, respectively. Adaptation to seawater strengths of 25, 50, 75, and 100% produced significant elevations of plasma osmolality, electrolytes, and AVT concentrations that plateaued with 50% seawater. Body mass and plasma AII levels were not significantly altered.Comparison of salt gland function in birds adapted to fresh water with those adapted to 100% seawater showed some differences in concentrating and secretory capabilities.
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