Karyotype,C-Bands and NORs in Larus ridibundus

The diploid chromosome number of L.ridibundus is determined to be 68 or so.Most of the macrochromosomes show a prominent centromeric C-band.The Z chromosome has a small,indistinct C-band,while the W chromosome is almost C-positive.The Ag-NORs are detected on 2 pairs of microchromosomes.