The breeding biology of Black Guillemots Cepphus gryllein Shetland

• Published in: Ibis
• Main Author: EWINS, PETER J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1989
• Subjects: Crows Nest; Cepphus grylle
• Online Access: http://dx.doi.org/10.1111/j.1474-919x.1989.tb04787.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1989.tb04787.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1989.tb04787.x

The breeding biology of Black Guillemots Cepphus grylle was studied from 1982 to 1984 in Shetland, on islands lacking introduced mammalian predators. Adult survival (94%), clutch size (1.75‐1.92) and breeding output (1.05‐1.34 young fledged per breeding pair) were very high, indicating that conditio...