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Prey to predator size ratio influences foraging efficiency of larval Aeshna juncea dragonflies

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Abstract

We investigated foraging behaviour of larval dragonflies Aeshna juncea in order to examine the significance of prey density and body size in predator-prey dynamics. A. juncea were offered separately three size-classes of Daphnia magna at low and high densities. The data were collected with direct observations of the foraging individuals. We found that large A. juncea larvae could better enhance their intake of prey biomass as prey size and prey density increased than their smaller conspecifics. However, increasing feeding efficiency of both larval instars was constrained by declining attack success and search rate with increasing prey size and density. With small D. magna, in contrast to large A. juncea, small A. juncea increased their searching efficiency as prey density increased keeping D. magna mortality rate at a constant level. In a predator-prey relationship this indicates stabilizing potential and feeding thresholds set by both prey density and prey-predator size ratio. Attack success dropped with prey size and density, but did not change in the course of the foraging bout. For both A. juncea sizes prey handling times increased as more medium and large prey were eaten. The slope of the increase became steeper with increasing prey-predator size ratio. These observations indicate that components of the predator-prey relationship vary with prey density, contrary to the basic assumptions of functional response equations. Moreover, the results suggest that the effects of prey density change during the ontogeny of predators and prey.

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  1. Integrative Ecology Unit, Division of Population Biology, Department of Ecology and Systematics, University of Helsinki, P.O. Box 17, FIN-00014, Finland

    Heikki Hirvonen & Esa Ranta

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  1. Heikki Hirvonen
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  2. Esa Ranta
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Correspondence to Heikki Hirvonen.

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Hirvonen, H., Ranta, E. Prey to predator size ratio influences foraging efficiency of larval Aeshna juncea dragonflies. Oecologia 106, 407–415 (1996). https://doi.org/10.1007/BF00334569

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