Presence of insectivorous birds in the forest area of Istanbul University, Turkey.

Facilitation insectivorous birds life which is among the significant predators of insects in the forest is extremely important in terms of maintaining an intact natural ecosystem, biological variety and biological fight against over-reproducing harmful insects. The aim of our study is to conduct a preliminary search of insectivorous birds living in the research forest. Observation and field studies were conducted between January-December 2002. Transect observation and counting methods were applied in the simplest way to observe the birds during the research. Aim of the count is to separate the bird species into ordinal categories of their abundance. As a result of this study 47of 88 bird species found in research area are insectivorous bird species. They belong to 19 families. When encounter rates of insectivorous birds are considered, one of them is common, nine of them are frequent, thirty six of them are uncommon and one species is rare.