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

Ecology
Noah G PerlutNeil J Buckley

Abstract

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 cut once between 21 June and 10 July; (3) late-hayed fields cut after 1 August; and (4) rotationally grazed pastures. We assessed whether these treatments affected adult apparent survival (phi) and recruitment (f), how sensitive these parameters were to the presence of nonbreeders and local dispersal, and the populations' ability to persist in these four habitats. On average, birds using late-hayed fields had > 25% higher apparent survival than those on the more intensively managed early-hayed, middle-hayed, and grazed ...Continue Reading

References

Mar 18, 2006·Proceedings. Biological Sciences·Joseph J NoceraLuc-Alain Giraldeau
Jun 10, 2006·Ecology·Bruce A Robertson, Richard L Hutto
Jan 9, 2007·Ecological Applications : a Publication of the Ecological Society of America·Noah G PerlutNeil J Buckley

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