Hybridogenetic Reproduction and Maternal Ancestry of Polyploid Iberian Fish: The Tropidophoxinellus alburnoides Complex

Iberian minnows collectively known as the Tropidophoxinellus alburnoides Steindachner complex comprise diploid and polyploid forms with highly female biased sex ratios. Previous investigators suggested that all-female clonal reproduction and interspecific hybridization may occur in this complex. We...

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Bibliographic Details
Published in:Genetics (Austin) 1997-07, Vol.146 (3), p.983-993
Main Authors: Carmona, J. A, Sanjur, O. I, Doadrio, I, Machordom, A, Vrijenhoek, R. C
Format: Article
Language:English
Subjects:
Animal populations
Animal reproduction
Animals
Biological Evolution
Cyprinidae - classification
Cyprinidae - genetics
Cytochrome b Group - genetics
DNA
DNA, Mitochondrial
Evolution
Female
Fish
Freshwater
Gene Dosage
Genes
Hybridization, Genetic
Investigations
Isoenzymes - genetics
Leuciscus
Male
Polymorphism, Restriction Fragment Length
Polyploidy
Reproduction
Tropidophoxinellus alburnoides
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Summary:Iberian minnows collectively known as the Tropidophoxinellus alburnoides Steindachner complex comprise diploid and polyploid forms with highly female biased sex ratios. Previous investigators suggested that all-female clonal reproduction and interspecific hybridization may occur in this complex. We examined nuclear (allozymes) and cytoplasmic genes (mtDNA) to assess the evolutionary origins, relationships, and reproductive modes of T. alburnoides from western Spain. The multi-locus allozyme data clearly revealed the hybrid nature of all polyploid forms of this fish and some diploid forms as well. Diagnostic markers identified fish from the genus Leuciscus as the paternal ancestor of hybrids in the Duero and Guadiana River Basins. Additionally, analysis of nuclear markers revealed that hybridogenetic reproduction occurs in the diploid and triploid hybrids. The hybrids fully express the paternal Leuciscus genome and then discard it during oogenesis. Hybridogenetic ova contain only maternal nuclear genes and mtDNA from a non-hybrid T. alburnoides ancestor. Apparently diploid and triploid hybrids of T. alburnoides persist as sperm parasites on males of a sexually reproducing Leuciscus host species.
ISSN:0016-6731
1943-2631
1943-2631
DOI:10.1093/genetics/146.3.983