Introgression of Luxilus Cornutus mtDNA into Allopatric Populations of Luxilus Chrysocephalus (Teleostei: Cyprinidae) in Missouri and Arkansas

Abstract

The cyprinid fishes Luxilus cornutus and Luxilus chrysocephalus hybridize extensively in a zone extending through the Great Lakes region with extensive introgression of L. cornutus mtDNA occurring in populations of L. chrysocephalus south of the present hybrid zone in Ohio. Western populations of these two species occur adjacent to one another in Missouri but hybridization has never been observed. In order to determine if hybridization has occurred historically in Missouri, allopatric populations of L. chrysocephalus were analysed for mtDNA introgression. Extensive introgression of L. cornutus mtDNA was observed in most populations of L. chrysocephalus in Missouri resulting in the elimination of L. chrysocephalus mtDNA in many populations. Luxilus cornutus mtDNA in L. chrysocephalus is found approximately 300 km south of extant L. cornutus populations in Missouri. Luxilus chrysocephalus mtDNA was replaced by four unique L. cornutus mtDNA haplotypes, with one particular haplotype becoming fixed in several L. chrysocephalus populations. The pattern of introgression suggests that historically L. cornutus occupied a more southern distribution in Missouri bringing it into contact with western populations of L. chrysocephalus and resulting in a hybrid zone.

Department(s)

Biological Sciences

Keywords and Phrases

Deoxyribonucleases; Type II Site Specific; mitochondrial DNA; RNA 16S; type II site specific deoxyribonuclease; animal; Cypriniformes; DNA sequence; genetic marker; genetic variability; genetics; geography; haplotype; hybridization; molecular genetics; nucleotide sequence; phylogeny; population genetics; restriction mapping; transposon; United States; Animal; Arkansas; Base Sequence; Cyprinidae; Deoxyribonuclease BamHI; Deoxyribonucleases; Type II Site-Specific; DNA Transposable Elements; DNA; Mitochondrial; Genetic Markers; Genetics; Population; Geography; Haplotypes; Hybridization; Genetic; Missouri; Molecular Sequence Data; Phylogeny; Restriction Mapping; RNA; Ribosomal; 16S; Sequence Analysis; DNA; Variation (Genetics); Luxilus chrysocephalus; Luxilus cornutus

International Standard Serial Number (ISSN)

0962-1083

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1995 John Wiley & Sons, All rights reserved.

Publication Date

01 Apr 1995

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