Tree and shrub invasion in northern mixed-grass prairie: implications for breeding grassland birds

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Multi-scale models of grassland passerine abundance in a fragmented system in Wisconsin (2008, background): “…woody patches (even solitary trees) in the surrounding landscape to be associated with lowered occurrence or densities of grassland birds in the focal patch (e.g., Coppedge et al. 2001; Ribic and Sample 2001; Bakker et al. 2002; Grant et al. 2004; Cunningham and Johnson 2006, Winter et al. 2006).”
Invasive alien goldenrods negatively affect grassland bird communities in Eastern Europe (2010, background): “In other research it was also found that the spread of shrubs and trees on the northern prairie in USA resulted in reduced bird numbers in 11 of the 15 breeding species (Grant et al., 2004).”
Conservation of Grassland Birds in North America: Understanding Ecological Processes in Different Regions: "Report of the AOU Committee on Conservation" (2007, background): “Invasion by exotic plants (Wilson and Belcher 1989, Robbins and Dale 1999, Scheiman et al. 2003, Grant et al. 2004) reduces avian occupancy of grassland.”