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- W2097745502 abstract "Abstract. 1. Predation risk to insects is often size‐ or stage‐selective and usually decreases as prey grow. Any factor, such as food quality, that accelerates developmental and growth rates is likely to reduce the period over which prey are susceptible to size‐dependent predation. 2. Using field experiments, several hypotheses that assess growth, development, and egg production rates of the rangeland grasshopper Ageneotettix deorum (Scudder) were tested in response to combinations of food quality and predation risk from wolf spiders to investigate performance variation manifested through a behaviourally mediated path affecting food ingestion rates. 3. Grasshoppers with nutritionally superior food completed development ≈ 8–18% faster and grew 15–45% larger in the absence of spiders, in comparison with those subjected to low quality food exposed to spider predators. Growth and development did not differ for grasshoppers feeding on high quality food when predators were present in comparison with lower quality food unimpeded by predators. Responses indicated a compensatory relationship between resource quality and predation risk. 4. Surviving grasshoppers produced fewer eggs compared with individuals not exposed to spiders. Because no differences were found in daily egg production rate regardless of predation treatment, lower egg production was attributed to delayed age of first reproduction. Results compare favourably with responses observed in natural populations. 5. Risk of predation from spiders greatly reduced growth, development, and ultimately egg production. Increased food quality counteracts the impact of predation risk on grasshoppers through compensatory responses, suggesting that bottom‐up factors mediate effects of spiders." @default.
- W2097745502 created "2016-06-24" @default.
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- W2097745502 date "2004-02-01" @default.
- W2097745502 modified "2023-10-16" @default.
- W2097745502 title "Development, growth, and egg production of<i>Ageneotettix deorum</i>(Orthoptera: Acrididae) in response to spider predation risk and elevated resource quality" @default.
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- W2097745502 doi "https://doi.org/10.1111/j.0307-6946.2004.00571.x" @default.
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