Info

Figure 24.5 Relationships between: (a) annual survival of Sedge Warblers Acrocephalus schoenobaenus at various sites in Britain; and (b) annual spring population index in Britain, and preceding annual rainfall in the Sahel zone of Africa, where Sedge Warblers spend part of the winter. Through presumed influence on food supplies, rainfall in West Africa affected the overwinter survival of Sedge Warblers, and hence their subsequent breeding densities in Britain. Redrawn from Peach et al. (1991).

Table 24.5 Relationships established between abundance or survival of migrants as measured from studies in Europe, and preceding winter rainfall in African wintering areas

Species (years) Area in Europe Area in Africa Parameter measured Source

Abundance Survival

Table 24.5 Relationships established between abundance or survival of migrants as measured from studies in Europe, and preceding winter rainfall in African wintering areas

Sand Martin Riparia riparia (1986-1992)

Hungary

West Africa

+ Sz├ęp (1995)

Was this article helpful?

0 0

Post a comment