Temperature-dependent consumption and gut-residence time in the opossum shrimp Mysis relicta |
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Authors: | Chipps Steven R |
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Institution: | Department of Fish and Wildlife Resources, University of Idaho Moscow, ID 83844-1136, USA |
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Abstract: | Maximum daily consumption was estimated for Mysis relicta fedad libitum rations of Daphnia pulex at 4,10,15 and 18°C.Gut-residence time was also evaluated for M.relicta fed clado-ceranprey at 4, 10 and 157deg;C. Mean daily consumption (g dry weightof Daphnia g1 dry weight of Mysis day1) rangedfrom 6% at 4%C to 12% at 10°. At 18°C, Mysis feedingrate declined to 9% day1. Mean, weight-adjusted consumptionrates exhibited a dome-shaped response in relationto water temperature. Consumption rate was highest at 10°Cand lowest at 4°C. Estimated Q10 was more sensitive from4 to 10°C (Q10= 3) than from 10 to 15°C (Q10=1.2). Gut-residencetime for Mysis was inversely related to water temperature, implyingthat evacuation rate increases linearly with water temperature.Feeding and gut-evacuation rates become disassociated at watertemperatures >10°C. As water temperature increased above1°C, relative evacuation rate increased, whereas feedingrate declined. It is postulated that at higher water temperatures,disassociated feeding and gut-evacuation rates reduce the scopefor growth of vertically migrating Mysis and impose a physiologicalconstraint that isolates Mysis from warm, epilimnetic waterduring thermal stratification.
1Present address: Center for Aquatic Ecology, Illinois NaturalHistory Survey, Sam Parr Biological Station, 6401 Meacham Road,Kinmundy, IL 62854, USA |
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