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EVALUATION OF POTENTIAL PRE-MATING REPRODUCTIVE ISOLATION IN TIGER BEETLES (CARABIDAE: CICINDELINAE)

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abstract
The biological species concept depends on mechanisms isolating reproduction to taxonomically define a species and to explain the disadvantages, and subsequent lack, of hybridization. In co-occurring tiger beetles (Carabidae: Cicindelinae), these between-species barriers are not readily apparent. To understand the characteristics potentially responsible for this isolation, we conducted behavioral and morphological experiments with two pairs of tiger beetle species. Choice trials showed males use visual cues to trigger the pursuit of potential mates and prefer females who appear similar in color. Geometric morphometric techniques allowed us to quantify shape differences in the mandibles of all four species. Previously, it was proposed that the mandible-coupling sulcus pairing acted as a lock-and-key mechanism to provide feedback necessary for species recognition. Our results, however, suggest that although there are significant differences in shape, these differences do not provide any feedback to the male or enhance his ability to retain is grasp on the female. Taken together, these findings suggest that vision, rather than the traditional mandibular lock-and-key hypothesis, may play a key role in reproductive isolation for co-occurring tiger beetle species.
subject
Cicindelinae
geometric morphometrics
hybridization
morphology
reproductive isolation
tiger beetle
contributor
Jones, Taylor (author)
Conner, William E. (committee chair)
Ashley-Ross, Miriam A. (committee member)
Anderson, Todd M. (committee member)
date
2018-05-24T08:35:54Z (accessioned)
2019-05-23T08:30:13Z (available)
2018 (issued)
degree
Biology (discipline)
embargo
2019-05-23 (terms)
identifier
http://hdl.handle.net/10339/90697 (uri)
language
en (iso)
publisher
Wake Forest University
title
EVALUATION OF POTENTIAL PRE-MATING REPRODUCTIVE ISOLATION IN TIGER BEETLES (CARABIDAE: CICINDELINAE)
type
Thesis

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