Consequences of a female‐biased sex‐ratio in a socially monogamous bird: female‐female pairs in the Roseate Tern Sterna dougallii

• Published in: Ibis
• Main Authors: Nisbet, Ian C.T., Hatch, Jeremy J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1999
• Subjects: Bird Island
• Online Access: http://dx.doi.org/10.1111/j.1474-919x.1999.tb07553.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1999.tb07553.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1999.tb07553.x

In the socially monogamous gulls and terns, female‐biased sex ratios are sometimes revealed by the occurrence of ‘supernormal clutches’, which are usually attended by female‐female pairs or other multi‐female associations. We studied these phenomena in the endangered Roseate Tern Sterna dougallii at...