A Cytogenetic Analysis of the Kartortpes of the Golden Shiner,Notemigonus crysoleucase, the Rudd,Scardinus erythrophthalmus,and Their Reciprocal F1Hybrids

Abstract

Standard (non-differentially stained) karyotypes of the golden shiner, "Notemigonus crysoleucas", rudd, "Scardinus erythrophtalmus," and their reciprocal F1 hybrids were documented. Both species possess 2N = 50 chromosomes. The karyotype of the golden shiner is comprised of 7 pairs of metacentric chromosomes, 11 pairs of submetacentric chromosomes, and 7 pairs of subtelo-/telocentric chromosomes, giving a (diploid) chromosome arm number estimate of 86. The karyotype of the rudd is comprised of 6 pairs of metacentric chromosomes, 9 pairs of submetacentric chromosomes, and 10 pairs of subtelo-/telocentric chromosomes, giving a (diploid) chromosome arm number estimate of 80. Reciprocal F1 hybrids possessed the expected number of chromosomes, i.e., 13 metacentric chromosomes, 20 submetacentric chromosomes, and 17 subtelo-/telocentric chromosomes. Specific marker chromosomes from both species were identified in the F1 hybrids. These data demonstrate substantial chromosomal differences between the two species, which could lead to chromosomal segregation anomalies in the meiosis of F1 hybrids; this could result in at least partial sterility.