Prey size selection and distance estimation in foraging adult dragonflies (original) (raw)

Abstract

To determine whether perching dragonflies visually assess the distance to potential prey items, we presented artificial prey, glass beads suspended from fine wires, to perching dragonflies in the field. We videotaped the responses of freely foraging dragonflies (Libellula luctuosa and _Sympetrum vicinum_—Odonata, suborder Anisoptera) to beads ranging from 0.5 mm to 8 mm in diameter, recording whether or not the dragonflies took off after the beads, and if so, at what distance. Our results indicated that dragonflies were highly selective for bead size. Furthermore, the smaller Sympetrum preferred beads of smaller size and the larger Libellula preferred larger beads. Each species rejected beads as large or larger than their heads, even when the beads subtended the same visual angles as the smaller, attractive beads. Since bead size cannot be determined without reference to distance, we conclude that dragonflies are able to estimate the distance to potential prey items. The range over which they estimate distance is about 1 m for the larger Libellula and 70 cm for the smaller Sympetrum. The mechanism of distance estimation is unknown, but it probably includes both stereopsis and the motion parallax produced by head movements.

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Acknowledgements

We thank Sandee Goci for her assistance in the fieldwork and Dr Manuel Leal for use of his computer and Videopoint software. This study was supported in part by NSF RUI 0211467 grant to RMO, and by a Union College summer research fellowship to CEB. All experiments complied with the “Principles of animal care”, publication No. 86–23, revised 1985, of the National Institute of Health.

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Authors and Affiliations

1. Department of Biological Sciences, Union College, Schenectady, NY, 12308, USA
   R. M. Olberg & C. E. Bessette
2. Department of Biology, Siena College, Loudonville, NY, 12211, USA
   A. H. Worthington & M. P. Loosemore
3. Department of Entomology, Cornell University, Ithaca, NY, 14853, USA
   J. L. Fox

Authors

1. R. M. Olberg
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2. A. H. Worthington
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3. J. L. Fox
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4. C. E. Bessette
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5. M. P. Loosemore
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Correspondence toR. M. Olberg.

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Olberg, R.M., Worthington, A.H., Fox, J.L. et al. Prey size selection and distance estimation in foraging adult dragonflies.J Comp Physiol A 191, 791–797 (2005). https://doi.org/10.1007/s00359-005-0002-8

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• Received: 06 October 2004
• Revised: 15 March 2005
• Accepted: 02 April 2005
• Published: 21 July 2005
• Issue Date: September 2005
• DOI: https://doi.org/10.1007/s00359-005-0002-8

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