Reproductive mode of the geographic parthenogenetic mayfly Ephoron shigae, with findings from some new localities (Insecta: Ephemeroptera, Polymitarcyidae) |
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Authors: | Koji Tojo Kazuki Sekiné Atsushi Matsumoto |
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Institution: | (1) Department of Biology, Faculty of Science, Shinshu University, Asahi, Matsumoto 390-8621, Japan;(2) Japan Society for the Promotion of Science (JSPS), Tokyo, Japan;(3) Biological Sciences, University of Tsukuba, Tsukuba, Japan |
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Abstract: | The burrowing polymitarcyid mayfly Ephoron shigae is distributed widely in Japan. Some populations are bisexual, others are unisexual, and the distributions of the two types
overlap broadly. Experimental evidence of parthenogenetic reproduction, long suspected in unisexual populations, is presented
here, based on a comparative analysis of the developmental rate of fertilized and unfertilized eggs. The developmental rate
of fertilized eggs from 20 mated females in a bisexual population was 98.4% ± 0.73% (mean ± SD), and no unfertilized eggs
from 20 virgin females in that population developed. The developmental rates of unfertilized eggs in two unisexual populations
were 89.0% ± 4.59% and 84.2% ± 1.96%, respectively. This article presents experimental evidence of geographic parthenogenesis
in E. shigae and provides support for the previous interpretation. In addition, we discuss the relationship between the sex ratio of each
population and the developmental rate of fertilized versus unfertilized eggs from the females in those populations. |
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Keywords: | Reproduction Aquatic insects Mayfly Parthenogenesis Geographic parthenogenesis |
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