Response of adult dragonflies to prey of different size and colour in the context of anti-predator defences
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Warning coloration is used by many prey species to advertise their unpalatability to potential predators and the evolution of such signals is strongly influenced by predator behaviour. I begin by reviewing the past literature on the potential role of invertebrates in shaping the evolution of warning signals in aposematism and mimicry. I then describe an investigation of the behaviour adult dragonflies in response to artificial prey of varying shape and colour, to determine the role of these traits in influencing foraging decisions. In two experiments, dragonfly species and sex, and prey size, influenced prey selection. However, neither prey colour, nor its interaction with prey size, affected the rate of attack of dragonflies. Through a feeding experiment, I also found that dragonflies preferred to feed on insects with softer exoskeletons. The implications of these findings for the evolution of warning signals and mimicry in small aerial insects are discussed.
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Copyright © 2017 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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duong-responseofadultdragonfliestopreyofdifferent.pdf | 2023-05-05 | Public | Download |