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In this study, we report the results of a long-term investigation on changes in population size and fledging success of Northern Lapwing on Wangerooge, a German Wadden Sea island. This population is increasing over a period of 34 years in contrast to numerous populations in North-western Europe. The reproductive success however declines over time and also with population density. Both effects cannot be considered separately due to autocorrelation. However, it is noted that the population on Wangerooge is not sustained by local recruitment only. This outcome is even more alarming as coastal areas and islands are considered as rare high quality meadow bird habitats. According to the present results Wangerooge cannot be considered as a source habitat for Northern Lapwings in North-western Germany.
