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Does heavy investment in foraging implicate low food acquisition for female Common Eiders Somateria mollissima?

M. Hario, Auteur ; M. Ost, Auteur

Dans Ornis Fennica (79(3) 2002)

In the northern Baltic Sea, Common Eiders Somateria mollissima feed mainly on mussels, taken exclusively by diving. By comparing the rate at which food is ingested (prey mass taken per time unit) with the rate of digestion (gut contents divided [...]

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Male sex bias in Eiders Somateria mollissima during spring migration into the Gulf of Finland

M. Kilpi, Auteur ; M. Ost, Auteur ; A. Lehikoinen, Auteur ; A. Vattulainen, Auteur

Dans Ornis Fennica (80(3) 2003)

We recorded the sex ratio of adult Eiders migrating into the Gulf of Finland during spring (March-May) 2001 by visual observations at Hanko Bird Observatory, SW Finland. A total of 22 509 males and 17 234 females were sexed during migration, giv[...]

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