Summary
Reproductive interference between three species of reptile tick, Aponomma hydrosauri, Amblyomma albolimbatum and Amb. limbatum was investigated. Adults of two species attach together on the same lizard hosts in narrow overlap zones at parapatric boundaries between species, providing opportunities for interference. The possibility of reproductive interference was suggested because of similarities in the sexual communication systems.
Three forms of interference were found in laboratory experiments. Firstly male movement to search for sexually receptive females was inhibited when females of two species were present on the same host, probably because of signal interference. Secondly, a nonspecific, short range attractant pheromone led males into non-conspecific courtship attempts which reduced the time for conspecific courtships. Thirdly Amb. albolimbatum males physically blocked the genitalia of female Ap. hydrosauri after unsuccessful non-conspecific courtship attempts. Field data showed this behaviour was common in both Amblyomma species after conspecific matings. Reproductive interference would reduce the fitness of each species in sympatry, and may contribute to the maintenance of the narrow parapatric boundaries.
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Andrews, R.H., Petney, T.N. & Bull, C.M. Reproductive interference between three parapatric species of reptile tick. Oecologia 52, 281–286 (1982). https://doi.org/10.1007/BF00363851
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DOI: https://doi.org/10.1007/BF00363851