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Former landfills have long been recognized as a potential source of early successional habitat for wildlife, but their use by migrating grassland and shrubland songbirds has yet to be studied. We estimated mass change rates of 5 grassland and shrubland songbird species during autumn stopovers at a reclaimed landfill in New Jersey, to assess the quality of a former landfill as a stopover habitat. We also examined minimum length of stay, age ratios, and age differences in body mass and fat scores. Regressions of capture time and body mass were statistically significant and indicated gains of 0.8-1.2% of average body mass per hour in Savannah Sparrows (Passerculus sandwichensis), Lincoln's Sparrows (Melospiza lincolnii), and Palm Warblers (Setophaga palmarum), but coefficients of determination were weak ( Key words: brownfields, early successional habitat, habitat restoration, migration, refueling. Por mucho tiempo, los sitios usados como vertederos han sido reconocidos como fuente potencial de hábitat sucesional temprano para la vida silvestre, aunque su use por aves canoras de praderas y matorrales está pendiente de ser estudiado. Para determiner is calidad del antiguo vertedero como hábitat de descanso y abastecimiento, estimamos la tasa de cambio de masa de cinco especies de aves de praderas y matorrales durante paradas migratorias otoñales en un vertedero restaurado en New Jersey, EUA. También examinamos is duración minima de estadia, proporción de edades y diferencias de edad en masa corporal y categorias de grasa corporal. Las regresiones de hora de captura y masa corporal fueron estadisticamente significativas e indicaron ganancias promedio de masa corporal por hora entre 0.8-1.2% en los gorriones Passerculus sandwichensis, Melospiza lincolnii y el chipe Setophaga palmarum, aunque sus coeficientes de detenninación fueron débiles ( Palabras clave: campos restaurados, hábitat sucesional temprano, migración, recarga de combustible, restauración de hábitat., Many bird species that inhabit grasslands, shrublands, and other early successional, disturbance-dependent habitats are in steep decline in the northeastern United States, as fire suppression, abandonment of agriculture, and other [...]

We investigated the impacts of urbanization on reproductive success of House Wrens (Troglodytes aedon). We compared reproductive effort and success for 33 nesting attempts in suburban sites (2.5-10 buildings/ha) and 43 nesting attempts in rural sites (, Land development can directly or indirectly impact native bird populations. For example, development alters habitat thereby reducing available areas for breeding and associated activities. Developed areas can have higher levels [...]