Osmoregulation in nestling California gulls at Mono Lake,California |
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| Affiliation: | 1. Department of Biology, Memorial University of Newfoundland, St. John''s, NL A1B3X9, Canada;2. Hochschule Mannheim University, Mannheim 68163, Germany;3. Department of Biochemistry, Memorial University of Newfoundland, St. John''s, NL A1B3X9, Canada;1. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany;2. Department of Biology, Chemistry, and Pharmacy, Freie Universität Berlin, Altensteinstraße 6, 14195 Berlin, Germany;3. School of Geography, Queen Mary University of London, Mile End Road, London E1 4N, UK;4. Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy;5. Faculty of Mathematics and Natural Sciences I, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany;6. Center for Applied Geosciences, Eberhard Karls Universität Tübingen, Hölderlinstr 12, 72074 Tübingen, Germany |
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| Abstract: | ![]()
- 1.1. Hematocrit (Hct), plasma sodium ([Na]pl), chloride ([Cl]pl) and osmotic concentration (Osmpl); volume and concentration of 1.0MNaCl induced salt gland secretion (SGS); and weights of osmoregulatory organs: kidneys, adrenal glands, and salt glands and nonosmoregulatory organs (liver and heart) were determined in nestling California gulls, Larus californiens (CG), on Krakatoa Islet, Mono Lake, California.
- 2.2. The mean Hct was 40.0% + 1.0%, the mean [Na]pl and [Cl]pl were 153.9 ± 0.9 and 110.1 ± 0.5 mM (n = 22); and the mean Osmpl was 323.6 ± 1.3 mOsm/kg (n = 18).
- 3.3. In CG nestlings with a mean age of 10 days (n = 7), the mean SGS [Na] was 719 ± 19 mM and the birds secreted 81 ± 18% of the injected fluid containing 59 ± 13% of the injected Na. By the mean age of 23 days (n = 7), mean SGS [Na] was slightly higher (790 ± 30 mM than in younger birds (P < 0.05), but the percentage of secreted fluid (54 ± 10%) and Na (42 ± 6%) tended to be less.
- 4.4. In 18 CG nestlings mean organ weights (% body weight) were: kidneys 1.52 ±0.06%; salt glands, 0.13 ±0.01%, and adrenal glands 0.07 ±0.01%.
- 5.5. Nestling CG had significantly greater Hct (P < 0.001), [Na]pl and [ci]pl (P < 0.001), Osmpl, (P < 0.005), and adrenal gland weight (P < 0.01), compared to nestling glaucous-winged Gulls (GWG), L. glaucescens (Hughes, 1984), which nest under cooler, moister conditions. CG kidney weight was smaller (P < 0.001); salt gland weight and salt excretion were the same as GWG.
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