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Abstract(s)
The endemic Iberian minnow Squalius alburnoides is a complex of fishes of hybrid
origin including both males and females with distinct ploidy levels and varying proportions of the
parental genomes. In this paper we demonstrated that in contrast to many vertebrate hybrid
lineages the sperm of triploid hybrid males of S. alburnoides is viable and fully functional. Flow
cytometry and analysis of sequences of a fragment of the beta-actin nuclear gene applied to
progenitors and offspring evidenced that these males produced their sperm clonally, as already
described for diploid hybrids. The presence of different types of fertile males (nonhybrid diploids
with normal meiosis and both diploid and triploid hybrids) coupled with hybridogenetic meiosis
in females endows this vertebrate complex with a high level of independence from other species
and contributes to maintain its genetic variability.
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Citation
Journal of Experimental Zoology, 307A, 220-225