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The Journal of Heredity 1999:90(6)
© 1999 The American Genetic Association 90:659-662

Brief communication. Constraints on elevated ploidy in hybrid and nonhybrid parthenogenetic snails

SG Johnson*, R Hopkins1, and K Goddard1

Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA 1Department of Biology, Ursinus College, Collegeville, Pennsylvania, USA *Corresponding author E-mail: sgiohnso@uno.edu

We used flow cytometry to determine the genome size of sexual, hybrid parthenogenetic, and spontaneous (nonhybrid) parthenogenetic snails in the genus Campeloma. All hybrid parthenogens were allotriploids (5.07 pg/nucleus ± 0.09) and all spontaneous parthenogenetic snails were autodiploids (3.69 pg/nucleus ± 0.11). In conjunction with previous results, these findings confirm that allotriploidy arose through interspecific hybridization between a sexual C. limum female and a male C. geniculum followed by backcrossing with a male C. geniculum. There was no indication of variable ploidy levels within allotriploid or autodiploid parthenogens. We argue that numerous mechanisms may prevent elevated ploidy level. These include destabilizing effects of continued backcrossing to sexual ancestors, and increased nutrient requirements and lower growth rates of tetraploids in stressful environments.


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