Roseate Terns (Sterna dougallii) frequently lay single eggs and desert them without incubating them. In a multi-year study, single deserted eggs comprised 4.2% of all clutches and 2.7% of all eggs. Laying dates and masses of single deserted eggs resembled those of first-laid eggs of female-male pairs and multi-female associations, but their masses differed from those of second-laid eggs of female-male pairs. An egg-transfer experiment showed that most single deserted eggs were fertile and that chicks hatched from them were viable when raised by female-male pairs. I hypothesize that single deserted eggs result from females laying their first eggs before the pair has settled on the location of a nest site. Fostering of single deserted eggs could be used to increase chick production in small colonies.
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11 November 2022
Roseate Terns (Sterna dougallii) Frequently Desert Viable Eggs without Incubating Them
Ian C. T. Nisbet
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Waterbirds
Vol. 45 • No. 1
March 2022
Vol. 45 • No. 1
March 2022
egg desertion
monitoring
single deserted eggs