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Variation of reproductive effort between parthenogenetic and sexual populations of the scorpion Tityus columbianus

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Geographic differences in reproductive effort were examined between sexual and parthenogenetic populations of the Colombian scorpion Tityus columbianus, from Iza (sexual) and from Mosquera (unisexual). The sexual females from Iza were significantly larger and had significantly greater relative litter mass (RLM) than the parthenogenetic ones from Mosquera. In both populations litter size increased significantly with female body size. Litter size and RLM in the sexuals averaged 12.7 and 0.49 respectively, and in the unisexuals 8 and 0.36. We suggest that the higher values are related to greater primary productivity at the Iza site.

Keywords: Colombia; Geographic variation; biogeography; brood size; parthenogenesis; relative litter mass; scorpions; tropical ecology

Document Type: Research Article

Affiliations: 1: Universite Pierre et Marie Curie, U.F.R. des Sciences de la Vie 4, Place Jussieu 75252 Paris Cedex 04, France 2: Department of Biology, University of Utah, Salt Lake City, Utah, 84112. U.S.A. 3: Instituto de Biologia, Departamento de Zoologia, Universidad Nacional Autonoma de Mexico. A.P. 70-153, Mexico D.F. 04510. Mexico

Publication date: May 1, 1996


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