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| ABOUT CTAP |
The
Critical Trends Assessment Program (CTAP) is a long-term endeavor, which monitors the
condition of forests, wetlands, grasslands, and streams throughout the state of
Illinois. This project seeks to assess changes in ecological conditions as well as
to serve as a baseline from which to compare regional and site-specific patterns
throughout Illinois. This program is unique because it is the first-ever attempt at
a statewide comprehensive assessment undertaken by a state natural resource organization
(Illinois Department of Natural Resources).
Between 1997-2001 the CTAP professional scientists of the Illinois Natural History Survey (INHS)
conducted surveys at 140 forest, 139 wetland, 126 grassland, and 149 stream sites. These 554 sites
(approximately 30 sites per year per habitat) were randomly selected from across the state on both
public and private lands. During this first five year cycle, data on birds, insects, and herbaceous
and woody vegetation were collected. Several ecological indicators such as species richness,
diversity, dominance of native vs. non-native taxa, and presence of threatened and endangered
species were measured at every site. In the case of birds, we also collected data on cowbird
abundance. In streams, aquatic insects were the primary assemblage used as indicators of quality.
Currently, CTAP is in its second five year cycle (2002-2006). During this cycle we will resample
all the sites that were visited from 1997-2001. It was the initial intent of the program that a
total of 150 sites (30 sites per year per habitat) be sampled per five year cycle. During the
second five year cycle, additional sites will be added to bring us up to this goal.
The
ultimate goal of CTAP is to collect, analyze, and then summarize this extensive and
completely unique dataset to better help scientists, local groups, lawmakers, state
and federal agencies, and citizens understanding the condition of Illinois's forests,
wetlands, grasslands, and streams. Additional information about CTAP can be
found in the following web page:
http://dnr.state.il.us/orep/ctap
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