KARYOTYPE, C-BANDS AND NORs IN LARUS RIDIBUNDUS
红嘴鸥核型及C带和银带

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.