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Diploidy and triploidy in the hybrid minnow,Phoxinus eos x Phoxinus neogaeus (Pisces: Cyprinidae)

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Summary

Two presumptive hybrid populations are examined. Nebraskan hybrids, all having allozymic F1 electromorphs, exist as both diploid (2n=50) and triploid (3n=75) forms. This supports the hypothesis of parthenogenesis as the mode of hybrid reproduction. The maximum number of nucleoli per cell is suggested as an indicator of ploidy level. In contrast, electrophoretic analysis of a postulated Mendelian hybrid population in Quebec failed to detect any allozymic heterozygotes or recombinants. A previous conclusion of introgressive hybridization in this population is not supported.

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Authors and Affiliations

  1. Office of Computer Services, Oakland University, 48063, Rochester, Michigan, USA

    G. R. Joswiak, R. H. Stasiak & B. F. Koop

  2. Department of Biology, University of Nebraska at Omaha, 68182, Omaha, Nebraska, USA

    G. R. Joswiak, R. H. Stasiak & B. F. Koop

  3. Department of Anatomy, Wayne State University, 48202, Detroit, Michigan, USA

    G. R. Joswiak, R. H. Stasiak & B. F. Koop

Authors
  1. G. R. Joswiak
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  2. R. H. Stasiak
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  3. B. F. Koop
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Additional information

This research was supported by the Theodore Roosevelt Memorial Fund. We wish to thank Arthur Ostrowski for his generous assistance. Collection of the Quebec specimens was made possible through the kindness of Etienne Magnin. We acknowledge the Department of Biological Sciences, Wayne State University, for providing research facilities.

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Joswiak, G.R., Stasiak, R.H. & Koop, B.F. Diploidy and triploidy in the hybrid minnow,Phoxinus eos x Phoxinus neogaeus (Pisces: Cyprinidae). Experientia 41, 505–507 (1985). https://doi.org/10.1007/BF01966171

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  • DOI: https://doi.org/10.1007/BF01966171

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