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• W2044667730 abstract "In Dynamite Lake, Illinois, the cladocerans Bosmina, Ceriodaphnia and Diaphanosoma coexist with planktivorous sunfish. An in situ enclosure experiment revealed that release of the cladocerans from fish predation resulted in an increased mean body size of Diaphanosoma and Ceriodaphnia and a slightly increased density of Diaphanosoma, the largest species. Increased body size of the cladoceran community resulted in a greater estimated grazing pressure on the phytoplankton community. The net result was greater phytoplankton density in the presence of fish, relative to when fish were excluded; there were also differences in phytoplankton community structure between treatments. The hypothesis that the increased in food (phytoplankton) arising from fish predation results in elevated survivorship and/or reproduction of the cladoceran individuals that managed to avoid predation was tested by conducting two life table experiments on the three cladocerans using, as media, water with natural phytoplankton densities from the enclosures with and without fish. The hypothesis was supported. Fecundity (in both experiments) and survivorship (in one experiment) of Diaphanosoma were increased on water from the fish enclosure, and fecundity of Ceriodaphnia was increased in one experiment. Significant increases in fecundity always led to significant increases in finite rate of increase (l). Reproduction of Bosmina was unaffected by the elevation in food; survivorship could not be accurately determined because of difficulties in handling this small species. The significance of these indirect demographic effects of fish on the age and size structure of the cladoceran populations was assessed using the life table data in Leslie matrices and obtaining stable and distributions when water from the fish enclosure (high phytoplankton) or the control enclosure (low phytoplankton) was used. For both Diaphanosoma and Ceriodaphnia, the populations projected under the conditions of fish enclosure water contained a greater proportion of younger individuals relative to the control at the stable age distribution. Since age and size are correlated in cladoceran populations, this analysis indicates that fish predators may indirectly alter zooplankton size structure through their effects on the food supply of the zooplankton, as well as directly modify size structure by removing the largest individuals." @default.
• W2044667730 created "2016-06-24" @default.
• W2044667730 creator A5000117941 @default.
• W2044667730 date "1986-04-01" @default.
• W2044667730 modified "2023-10-14" @default.
• W2044667730 title "Fish Predation and Zooplankton Demography Indirect Effects" @default.
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• W2044667730 doi "https://doi.org/10.2307/1938577" @default.
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