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- W2313261014 abstract "I experimentally examined the relative importance of a top predator in a three trophic level food chain in which the abiotic conditions were varied. Food chains consisting of plants, grasshoppers and wolf spiders were established in field cages placed over natural prairie. Grasshopper resource intake was manipulated by altering the abiotic environment (i.e., shading during peak grasshopper feeding times to reduce temperature and radiation), and thus the time they had available for feeding. Grasshoppers in control (unshaded) food chains compensated for spider predation by increased per capita survival and food consumption by those remaining. In this scenario, plant biomass was unaffected by the presence of spiders (i.e., no trophic cascade). However, when the grasshoppers were shaded for the morning hours, reducing their time available for feeding, spiders reduced grasshopper density, and the abundance of plants increased relative to when spiders were absent (i.e., a trophic cascade). This experiment showed that by simply altering the abiotic environment such that grasshopper foraging ability changed, profound differences in the impacts of top predators resulted." @default.
- W2313261014 created "2016-06-24" @default.
- W2313261014 creator A5036693278 @default.
- W2313261014 date "1996-12-01" @default.
- W2313261014 modified "2023-10-17" @default.
- W2313261014 title "Abiotic Controls of Trophic Cascades in a Simple Grassland Food Chain" @default.
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- W2313261014 doi "https://doi.org/10.2307/3545939" @default.
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