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• W2077909838 startingPage "735" @default.
• W2077909838 abstract "The functional response of an organism is often assumed to maximize its fitness. We examined the relationship between functional response and body growth, survivorship, and reproduction in Daphnia magna under controlled and comparable conditions. In a previous study we determined that D. magna exhibits a Holling Type II functional response with an asymptotic increase in ingestion rate with increasing food concentration to a maximum rate at an incipient limiting concentration of °104 Chlamydomonas reinhardi cells/cm3 (measured as carbon, 0.2 mg/L) and that observed feeding activity does not follow the predictions of energy optimization models. In this study, we determined the fitness response for cohorts of D. magna (n = 20—30) at 0, 103, 104, 105 and 106 Chlamydomonas reinhardi cells/cm3 using life table methods. Most parameters indicative of fitness (e.g., body growth, fecundity, survivorship, r, and R0) were maximal at 105 cells/cm3 (2.0 mg/L). The optimum food concentration for growth and reproduction remained at 105 cells/cm3 when cohort life spans were truncated in a simulation of mass mortality due to predation or environmental deterioration. The fitness optimum occurred above the incipient limiting concentration and below the maximum food concentration encountered in nature. These appear to be suboptimal behavioral and reproductive responses. However, reproductive models of parthenogenesis and resting egg formation along with these feeding, growth, and reproductive responses suggest that Daphnia track the environment in that they are adapted for rapid population increase and for recovery from mass mortality in cyclical environments in conditions for optimal growth that can be expected to reoccur but are of highly variable duration." @default.
• W2077909838 created "2016-06-24" @default.
• W2077909838 creator A5031421794 @default.
• W2077909838 creator A5051246442 @default.
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• W2077909838 date "1983-08-01" @default.
• W2077909838 modified "2023-10-10" @default.
• W2077909838 title "Functional Response and Fitness in a Generalist Filter Feeder, Daphnia Magna (Cladocera: Crustacea)" @default.
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• W2077909838 doi "https://doi.org/10.2307/1937196" @default.
• W2077909838 hasPublicationYear "1983" @default.
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