Respiratory metabolism of mosquitofish,Gambusia affinis: effects of temperature,dissolved oxygen,and sex difference |
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Authors: | Joseph J Cech Jr Michael J Massingill Bruce Vondracek Alison L Linden |
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Institution: | (1) Department of Wildlife and Fisheries Biology, University of California, 95616 Davis, CA, U.S.A.;(2) Present address: Aquatic Systems, Inc., P. O. Box 8301, La Jolla, CA, 92038, U.S.A. |
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Abstract: | Synopsis Routine respiratory metabolic rates of mosquitofish ( 0.2 g live weight) were determined at 10, 15, 20, 25, 30, and 35°C at normoxic, hypoxic (= 40 torr PO2), and extreme hypoxic (= 25 torr PO2) conditions. Rates generally increased with increases in temperature (overall Q10 = 2.11 at normoxia). Significant depressions (P<0.05) in rates were measured at 30 and 35°C at extreme hypoxic conditions. Males exhibited higher mortality at extreme hypoxia than females, especially at 35°C. Metabolic rates were significantly elevated at hyperoxic conditions (= 300 torr PO2) at 25 and 30°C, but not at 35°C. Resting routine rates of less-confined fish were determined at 20, 25, and 30°C at normoxia and were significantly lower than the routine rates at the same temperatures. Behavioral experiments showed that aquatic surface respiration is initiated by mosquitofish at 20–65 torr PO2 and is obligatory below 20 torr at 20° C. Overall, respiratory metabolic rates provide a quantitative metabolic basis from which predation rates of mosquitofish in various environments can be estimated. |
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Keywords: | Hypoxia Hyperoxia Poeciliidae Mosquito control Environmental tolerances |
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