Grassland songbird survival and recruitment in agricultural landscapes: implications for source-sink demography.

Population growth and decline are particularly sensitive to changes in three key life-history parameters: annual productivity, juvenile survival, and adult survival. However, for many species these parameters remain unknown. For example, although grassland songbirds are imperiled throughout North America, for this guild, only a small number of studies have assessed these parameters. From 2002 to 2006, in the agricultural landscape of the Champlain Valley of Vermont and New York, USA, we studied Savannah Sparrow (Passerculus sandwichensis) and Bobolink (Dolichonyx oryzivorus) demography on four grassland treatments: (1) early-hayed fields cut before 11 June and again in early- to mid-July; (2) middle-hayed fields...

Categories: Publication; Types: Citation, Journal Citation; Tags: Bobolink, Champlain Valley, Dolichonyx oryzivorus, Ecology, New York and Vermont, All tags... Passerculus sandwichensis, Savannah Sparrow., apparent survival, grassland hayfield management, local dispersal, realized lambda, recruitment, rotationally grazed pasture, Fewer tags