. Programme d'évaluation des tendances critiques : garder un oeil sur les habitats de l'Illinois. Programme d'évaluation des tendances Critial ; conservation de l'habitat. ^^^j<rr,.- ^ : 'M. '^^j w : i. Cl ?m AP botanistes la collecte des données dans les zones humides de l'Illinois. J'Jlinois est un paysage en transition. L'évolution de l'environnement de l'Illinois : tendances critiques, un état de l- envlronment rapport publié en 1994 par le ministère de l'Illinois de l'énergie et des ressources naturelles (maintenant le ministère des Ressources naturelles) ont conclu que l'habi- tats dans l'Illinois se détériore du fait de la fragmentation de l'habitat et de stress biotiques et abiotiques. Ce r

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. Critical trends assessment program : keeping an eye on Illinois habitats. Critial trends assessment program; Habitat conservation. ^^^i<rr, .- ^: 'm. '^i w: ^i. ?m Cl AP botanists collecting data in an Illinois wetland. I Jlinois is a landscape in transition. The Changing Illinois Environment: Critical Trends, a state-of-the- envlronment report published in 1994 by the Illinois Department of Energy and Natural Resources (now the Department of Natural Resources) concluded that habi- tats in Illinois were deteriorating as a result of habitat fragmentation and biotic/abiotic stressors. This report recommended collecting statewide data on both the current conditions and future trends in Illlinois habitats. Since 1997 the scientists of the Critical Trends Assess- ment Program (CTAP, ctap.inhs.uiuc.edu/) have been undertaking this task. CTAP is a long-term habitat monitoring program across the state of Illinois. It is sponsored by the Illi- nois Department of Natural Resources (dnr.state. il.us/) and housed at the Illinois Natural History Survey (www.inhs.uiuc.edu/). The main goal of CTAP is to gather baseline data on the current conditions of forests, wetlands, grasslands, and streams and to deter- mine how these habitats are changing. This information supports efforts to preserve, restore, and manage Illinois forests, wetlands, grasslands, and streams. CTAP has been collecting detailed biological data in 600 randomly selected sites (150 randomly selected sites per habitat [30 sites per year rotating on a five-year cycle])(Fig. 1) from across the state on both public and private lands (Fig. 2). Data on plants, birds, and terres- trial insects have been collected in forests, wetlands, and grasslands (Table 1), while for streams aquatic insect data are collected (see CTAP Web page for sampling proto- cols). Although CTAP has accumulated an incredible amount of information during its first five-year cycle (1997- 2001) and has detected several trends (see CTAP Web page f