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- W2040691900 abstract "In order to evaluate the stomach-content method in estimating predation rates in the field, we systematically investigated how the digestion time of three gelatinous planktivorous predators were related to qualitative and quantitative characteristics of common prey items. The scyphomedusa Aurelia aurita showed a weak but statistically significant increase in digestion time with prey number. A meal of one or two Artemia nauplii was on average digested within 1.1–1.2 h, whereas meals of three to eight Artemia needed 1.6–1.9 h for complete digestion. Meals of bigger prey, the copepod Calanus finmarchicus, were digested in 2.3 (two prey) to 5.1 h (12 prey), and meals of one to four herring larvae were digested in 3.7 h. Five different prey species gave average digestion times between 1.1 and 5.1 h, proportionally related to the prey size. For a given prey there was none or a weak tendency of decreased digestion time with increased size of medusa. The scyphomedusa Cyanea capillata digested two size classes of C. finmarchicus (5–30 prey per meal) in 1.5 and 2.0 h (average), respectively, and three species of gelatinous zooplankton (1 prey per meal) in 1.8 to 15.1 h, but with large intra-specific variability. The lobate ctenophore Bolinopsis infundibulum digested the same two size classes of C. finmarchicus (1–10 prey per meal) in 0.3 to 3.8 h, and herring larvae (1–8 prey per meal) in 0.7–3.5 h, with a weak positive relationship between digestion time and prey number for all three types of prey. Prey type was a significant factor for the digestion time of all three predators. C. capillata showed on average ca. 12 times longer digestion time for A. aurita than for B. infundibulum, A. aurita digested herring larvae 3.8 times slower than Artemia, and B. infundibulum digested herring larvae 2.6 times slower than C. finmarchicus <1 mm, given that the same predator/prey size relationships were compared. The findings emphasize the importance of using prey/predator specific digestion times in field studies based on stomach contents." @default.
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- W2040691900 date "1999-01-01" @default.
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- W2040691900 title "Nutritional ecology of gelatinous planktonic predators. Digestion rate in relation to type and amount of prey" @default.
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- W2040691900 doi "https://doi.org/10.1016/s0022-0981(98)00101-4" @default.
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