. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 18 Critical Trends in Illinois Ecosystems. An average of forest-dependent bird species was detected at each CTAP site in 1997-1998. â Sugar Maple DOak â HicKory 1 Ji. 5-10 101-20 201-30 30 1-«] 401-50 50 1-60 >60 Tree diameler in centmeters Figure 11. Maple takeover at Fern Trail Forest Finally, ForestWatch volunteers also collected data on the presence of gypsy moth (a pest intro- duced from Europe) egg m
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 18 Critical Trends in Illinois Ecosystems. An average of forest-dependent bird species was detected at each CTAP site in 1997-1998. â Sugar Maple DOak â HicKory 1 Ji. 5-10 101-20 201-30 30 1-«] 401-50 50 1-60 >60 Tree diameler in centmeters Figure 11. Maple takeover at Fern Trail Forest Finally, ForestWatch volunteers also collected data on the presence of gypsy moth (a pest intro- duced from Europe) egg masses and signs of dogwood present in large num- bers, gypsy moth caterpillars can defoliate a forest and lead to tree mortality. Currently, they are found primarily in northern Illinois. Anthracnose is a fungal disease introduced from Asia that can deci- mate flowering dogwoods, which occur primarily in the southern half of Illinois. Anthracnose can be compared to chestnut blight and Dutch elm dis- ease, wliich have affected chestnut and elm trees across the eastern United States. No g>'psy moth egg masses were found at any site, but five of 16 sites with flowering dogwood reported evidence of anthracnose. Forest Birds Each species of bird exhibits a different degree of habitat specialization. Some species, such as the introduced European starling, are habitat general- ists, which may partially explain why they have successfully spread throughout the countr)'. Other species are higlily specific in their habitat require- ments, which can include a certain minimimi area of habitat as well as a specific type of habitat. The presence or absence of these specialist species can therefore provide information about the qualitv' of a habitat. The 24 species listed in Table 6 are area- sensitive forest-dependent species; their diversity and abundance can serve as indicators of forest conditions in Illinois. An average of forest-dependent bird species was dete
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