We monitored the breeding performance of Black-tailed Gulls Larus crassirostris on Kabushima Island from 2012 to 2023. The island has been connected to Honshu Island by a manmade isthmus since the 1940's. The mean number of eggs per nest on 13 – 20 May varied between 1.57 and 2.16. The number of chicks on 1 – 15 July per number of eggs counted on 13 – 20 May varied between 0.01 and 0.29.
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Tomita et al. (2024) studied this question.
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