Individual study: Non-wooded filter strips on agricultural lands contain greater species richness and abundance
Henningsen J.C. & Best L.B. (2005) Grassland Bird Use of Riparian Filter Strips in Southeast Iowa. The Journal of Wildlife Management, 69, 198-210
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Restore or create grasslands
A replicated study from May-July in 2001-2002 in 33 corn and soybean fields containing riparian filter-strips (all ? 200 m long and > 1 km apart) in Iowa, USA (Henningsen & Best 2005), found that species richness and abundance of grassland birds was similar between strips planted with warm-season grasses, compared to cool-season grasses, but that strips next to woody streamside vegetation held fewer species (6/site) than those with adjacent non-woody vegetation (8 species/site). Nest success was low in all treatments (only 27% of nests fledged at least one nestling) due chiefly to predation (85% of all nests). Cool-season species included brome grass, orchard grass Dactylis glomerata and timothy Phleum pratense; warm-season strips were planted mainly with switchgrass Panicum virgatum.