Characteristics of Mediterranean/ Dark Atlantic Intersection Forms
A map showing the approximate boundaries of the Dark, Cantabrican and west Portugal/north-west Spain cline is shown in
Figure 3 . The darkness of the mantles at Faro and Asilah, only 250 and 50 km respectively from Tanger, shows the range of the Dark Atlantic Yellow-legged Gull form extends very close to the entrance to the Mediterranean. On the boundaries, possible intermediate populations may occur between Dark Atlantic and Mediterranean Yellow-legged Gulls in the Huelva/ Cádiz/ Tanger/ Gibraltar/ Malaga area.Preliminary findings:
Cádiz, Huelva:
the Yellow-legged Gulls breeding in these areas are thought to originate from the Mediterranean (Ruiz & Solis, 1984) but no detailed field descriptions are available.© Copyright Nick Rossiter 2000-2001.