Population trends and density
regulation in Baltic migrants
Large numbers of migrant passerines
are ringed during spring and autumn on the small Danish island of Christiansø in
the Baltic Sea. Using the data for 1976-1996 the population trend of the 29
most numerous species have been investigated. This includes an examination of
the occurence of density dependent regulation, and in which part of the annual
cycle it may eventually take place (C. Rahbek, with J. Rabøl, Zoological
Institute).