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Reproductive Interference between the Common Ground-hopper Tetrix undulata and the Slender Ground-hopper Tetrix subulata (Orthoptera, Tetrigidae)

Published online by Cambridge University Press:  16 June 2008

A. Hochkirch*
Affiliation:
University of Osnabrück, Department of Biology/Chemistry, Division of Ecology, Barbarastrasse 13, D-49076 Osnabrück, Germany University of Trier, Department VI, Biogeography Group, Am Wissenschaftspark 25–27, D-54296 Trier, Germany
A. Bücker
Affiliation:
University of Gießen, Institute of Landscape Ecology and Resources Management, Heinrich-Buff-Ring 26, D-35392 Gießen, Germany
J. Gröning
Affiliation:
University of Osnabrück, Department of Biology/Chemistry, Division of Ecology, Barbarastrasse 13, D-49076 Osnabrück, Germany
*
*Author for correspondence Fax: +49-651-201-3851 E-mail: hochkirch@uni-trier.de

Abstract

The coexistence of closely related species is often hampered by resource competition or reproductive interference (interspecific sexual interactions). Species utilising similar signal channels might face substantial problems when they co-occur. It has, therefore, been suggested that reinforcement might drive signal evolution in narrow suture zones of secondary contact. However, species with large overlapping ranges are usually not believed to interact sexually. The Slender Ground-hopper, Tetrix subulata, and the Common Ground-hopper, Tetrix undulata (Orthoptera: Tetrigidae) are sister species, which occur sympatrically in large parts of western and Central Europe, but rarely share the same habitat. It has been hypothesized that reproductive interference might account for their missing coexistence. Here, we test experimentally whether these two species interact sexually. Our results suggest an incomplete premating isolation of these ground-hoppers, as we recorded heterospecific courtship, mating attempts and mating. The number of conspecific copulations and mating attempts of T. subulata decreased substantially in the presence of T. undulata, whereas the latter species was not negatively affected. Males of both species preferred to approach females of T. undulata, whereas females of both species did not discriminate against heterospecific males. Further studies on the reproductive success are needed to clarify whether reproductive interference might influence habitat partitioning between these species.

Type
Research Paper
Copyright
Copyright © 2008 Cambridge University Press

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