Visual Active Space of the Milfoil Weevil, <Emphasis Type="Italic">Euhrychiopsis lecontei</Emphasis> Dietz (Coleoptera: Curculionidae) |
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Authors: | Justin L Reeves Patrick D Lorch |
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Institution: | (1) Department of Biological Sciences, Kent State University, Kent, OH 44242, USA;(2) Present address: Department of Biology, Colorado State University, Fort Collins, CO 80523, USA |
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Abstract: | Euhrychiopsis lecontei Dietz (Coleoptera: Curculionidae), a native weevil, is used as a biological control agent for the invasive aquatic macrophyte,
Eurasian watermilfoil (Myriophyllum spicatum L.). Because E. lecontei overwinters on land in the adult stage and must find plants in lakes each spring, plant finding behaviors are essential to
eventually understanding and predicting long term biological control. Our research showed that E. lecontei is visually attracted to M. spicatum at up to 17.5 cm, and is more attracted to plants than other visual stimuli within 15 cm. We also showed that turbidity may
affect visual plant finding at 15 cm. Using available data from this and other previous studies involving chemical cues and
other life history traits, we propose a testable conceptual model for how E. lecontei finds plants each year, especially while underwater. This model may also be used to explain plant finding by aquatic phytophagous
insects in general. |
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