Variatie in legselgrootte en eivolume bij Noordse Stern Sterna paradisaea, Visdief S. hirundo en Grote Stern S. sandvicensis Instituut voor Natuur- en Bosonderzoek
In 1992-1994, we measured clutch and egg sizes in Arctic, Common and Sandwich Terns, nesting at the island Griend in the Dutch Wadden Sea. For all three tern species, first-laid eggs were larger than last-laid eggs. Clutches with relatively large first-laid eggs also had relatively large last-laid eggs, although the extra investment in the latter was smaller than in the former. Eggs of Common Terns were on average larger than eggs of Arctic ...