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- W2103923897 abstract "Abstract. 1. Despite considerable recent debate on the suitability of ratio dependence as a more general form for the functional response in consumer–victim relationships, there have been few detailed studies to experimentally determine the response of insect parasitoids to host and parasitoid density at a local scale. 2. The experimental host, Ephestia kuehniella , was used to test for host dependence and ratio dependence in the functional response of the egg parasitoid, Trichogramma minutum , a species widely used in inundative biological control. The functional response was examined through four series of experiments in which either host density, parasitoid density, or the ratio of previously parasitised to healthy hosts was manipulated. 3. The response to host density was type I for both single and simultaneously foraging parasitoids, indicating a lack of host dependence in the functional response. The upper limit to the response was estimated as 39 hosts attacked in a 24‐h period, with an estimated per capita search rate of 1.32 for individual females and 0.37 for three simultaneously searching females. 4. The response to parasitoid density provided an interference constant of unity, indicating an equal sharing of hosts and thus ratio dependence in the functional response. Female parasitoids responded to the presence of conspecifically parasitised eggs with a significant increase in search rate (1.75), but with no change to the form or upper limit of the response. 5. It is suggested that ratio dependence may be more common among insect parasitoids than previously supposed, and that a type I functional response, or the absence of host dependence, may be an emergent property of phylogenetic constraint within the monophyletic grouping of Cales , Eretmocerus , and Trichogramma ." @default.
- W2103923897 created "2016-06-24" @default.
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- W2103923897 date "2004-04-01" @default.
- W2103923897 modified "2023-10-16" @default.
- W2103923897 title "Ratio dependence in the functional response of insect parasitoids: evidence from Trichogramma minutum foraging for eggs in small host patches" @default.
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- W2103923897 doi "https://doi.org/10.1111/j.0307-6946.2004.00584.x" @default.
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