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Chromosome analysis in coregonid individuals in the interspecific hybridization zone
Author(s) -
Kirtiklis L.,
Jankun M.
Publication year - 2006
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2006.00759.x
Subject(s) - biology , interspecific competition , chromosome , interspecific hybridization , evolutionary biology , zoology , genetics , ecology , gene , botany , hybrid
Summary Artificial spawning (reproduction), a popular method in fisheries, has caused the unintentional hybridization between native European whitefish ( Coregonus lavaretus ) and introduced peled ( Coregonus peled ). The resultant hybrids are fertile and their morphological identification is impossible. The study shows the genetic characteristics of the hybrid coregonid fish specimens. Analyses of the number and morphology of chromosomes were based on conventional Giemsa staining. Nucleolar Organiser Regions (NOR) were analysed using CMA 3 ‐ and Ag‐NOR staining. Metaphases were also investigated by C‐banding methods. Hybrid specimens had a diploid chromosome number (2n) ranging from 76 to 80 and an arm chromosome number ranging from 96 to 100. NORs were observed on the subtelo‐acrocentric and submeta‐metacentric chromosomes. Results of the present study indicate a high level of chromosomal differentiation due to rearrangement taking place in the gene pool of whitefish/peled hybrids.