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Chromosomal studies on ten species of notothenioid fishes (Notothenioidei: Bathydraconidae, Channichthyidae, Nototheniidae)

2002; Karger Publishers; Volume: 98; Issue: 4 Linguagem: Inglês

10.1159/000071050

1424-8581

Vincenzo Caputo, P. Nisi Cerioni, Andrea Splendiani, Teresa Capriglione, Gaëtano Odierna, Ettore Olmo,

Genetic diversity and population structure

The results of a cytogenetic study conducted with banding and in situ hybridization techniques using ribosomal and telomeric probes on various species belonging to three families (Bathydraconidae, Channichthyidae and Nototheniidae) of the perciform suborder, Notothenioidei, are reported. The heterochromatin distribution and composition, nucleolar organiser and localisation of telomeric sequences seem to indicate that both in karyologically conservative families such as channichthyids and in families exhibiting greater karyological variability, certain DNA fractions like ribosomal genes and centromeric and telomeric DNAs are prone to some variability. This could play an important role in favouring or hampering chromosome rearrangements.