. Critical Trends Assessment Program : 2001 report. Ecosystem management; Environmental monitoring; Natural resources surveys. In grasslands, CTAP monitoring detected an average of only grassland dependent species. Only 26 of the 180 encounters of grassland dependent species were of highly ASSp. Many of the highly ASSp such as Short-eared Owl, Northern Harrier, and Upland Sandpiper have never or rarely been detected at the CTAP sites (Fig. 1). In addition, some of the moderate and low ASSp such as Vesper Sparrow and Western Meadowlark have very low detection rates (Fig. 1). The most freque
. Critical Trends Assessment Program : 2001 report. Ecosystem management; Environmental monitoring; Natural resources surveys. In grasslands, CTAP monitoring detected an average of only grassland dependent species. Only 26 of the 180 encounters of grassland dependent species were of highly ASSp. Many of the highly ASSp such as Short-eared Owl, Northern Harrier, and Upland Sandpiper have never or rarely been detected at the CTAP sites (Fig. 1). In addition, some of the moderate and low ASSp such as Vesper Sparrow and Western Meadowlark have very low detection rates (Fig. 1). The most frequently encountered species in Illinois grasslands are Dickcissel and Eastern Meadowlark. It should be noted that there is a lot of variation between years for ASSp (Fig. 1). This might be related to habitat quality and size. Similar to forests, detection rates for Brown-headed Cowbirds were very high (average for all years. Fig. 1). t. 80 - 60 o Z 40 S & 20. ja â-p. mA ^ BHCD BOBO DCK BVME GRSP HESP N>A SAVS SECW SBNR LPSA VESP \AB«E â 1997 01998 "1999 -2000 «ALL Figure 1. Detection rates for grassland dependent species from 1997-2000. (BHCO = Brown-headed Cowbird; BOBO = Bobolink; DICK = Dickcissel; EAME = Eastern Meadowlark; GRSP = Grasshopper Sparrow; HESP = Henslow's Sparrow; NOHA = Northern Harrier; SASP = Savannah Sparrow; SHOW = Short-eared Owl; SEWR = Sedge Wren; UPSA = Upland Sandpiper; VESP = Vesper Sparrow; WEME = Western Meadowlark) 47. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Natural Resources; Illinois. Office of Realty and Environmental Planning; Illinois. Natural History Survey Division; Critical Trends Assessment Project. Springfield, Ill. : Illinois Dept. of Natural Resources
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