Distribution and numbers of wintering sea ducks in Swedish offshore Waters.
The first survey of seaducks covering the offshore watersof the entire Baltic was undertaken in 1992/1993, when,however, the Swedish waters were covered with relativelyfew ship surveys. The second all Baltic survey 2007–2011included extensive aerial surveys of all Swedish offshorewaters. This paper presents the Swedish data from thesetwo surveys, supplemented with data from several other butpartia
