Arachnologische Mitteilungen

DOI Code: 10.5431/aramit3003
Author(s): Muster, C., B. Böttcher, C. Komposch & B. Knoflach
Year: 2005
Title: Neue Nachweise bi- und unisexueller "Populationen" von Megabunus lesserti (Opiliones: Phalangiidae) in den Nordostalpen.
Title translated: Bisexuals surrounded by all-female clones: new records of Megabunus lesserti (Opiliones: Phalangiidae) in the north-eastern Alps.
Issue: Heft 30
Pages: 20-24
Abstract: New data on the sex ratio of 16 populations of the endemic harvestman Megabunus lesserti Schenkel, 1927 in the northeastern Alps confirm the previously assumed pattern of geographic parthenogenesis. Bisexuals inhabit a small area between the eastern margin of the Northern Calcareous Alps and the Ennstaler Alps, which was covered by ice during the last (Würm) glaciations. Postglacially recolonized areas are occupied by parthenogenetic clones. Some all-female samples were found in close geographic proximity to bisexual populations. Apparently isolated occurrences at the western (Ammergau Alps) and southwestern (Carinthian) limits of the range proved to consist exclusively of females. A single male recorded in the Karwendel Mts. near Innsbruck is interpreted preferentially as a case of spanandry, being a fatherless "mistake" without any significant function.
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Keywords: Austria, Eastern Alps, faunistics, geographic parthenogenesis, harvestmen, Opiliones, sex ratio, spanandry

Arachnologische Gesellschaft - Arachnologische Mitteilungen - 10.5431/aramit3003 - 26.7.2017