Figure 2

Sexing and paternity in skuas. (A) An adult south polar skua (Catharacta maccormicki; above) and an adult brown skua (C. lonnbergi; below). (B) Multilocus DNA fingerprints resulting from hybridization of probe pV47–2 to genomic DNA from male and female brown skua digested with the restriction enzyme Hae III [14]. Arrows indicate two sex-linked DNA fragments that are present in females but absent in males. (C) Multilocus DNA fingerprints of three south polar skua families with the proposed relationships indicated above. DNA fragments that cannot be attributed to either putative parent (resident at the nest) are indicated by arrows.