Population Dynamics and Breeding Success of the Shag, Phalacrocorax aristotelis, on the Farne Islands, Northumberland

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Abstract
A population study of the shag (P. aristotelis (L.)) started on the Farne Islands in 1961 and continued until 1971. Many breeding individuals were originally ringed as chicks and the majority of the population consisted of individually marked birds of known age. Survival during red tides, age, mortality, breeding, clutch size, density, pair status, social behavior, feeding and competition was examined. A computer model of nest-site quality was presented.

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