Species diversity and niche separation of cocoon parasitoids in different forest types with endemic populations of their host, the Common Pine Sawfly Diprion pini (Hymenoptera: Diprionidae)
Herz, A.(Technische Universitaet Muenchen, Freising (Germany). Dept. of Ecology)E-mail:[email protected] | Heitland, W.
Species diversity and potential impact of cocoon parasitoids on the abundance of Diprion pini were explored in different forest habitats by the regular exposure of laboratory reared sawfly cocoons. In more fertile, mixed spruce/pine forests, parasitism on exposed cocoons was lower than in typical outbreak stands with a lower vegetational diversity. The parasitoid communities comprised of up to nine parasitoid species which showed temporal and spatial niche separation. Pleolophus basizonus occured throughout the season at all strata as well as in all forest types. Gelis cursitans was only found in pine forests with sparsely developed ground vegetation. Monodontomerus dentipes and M. minor were present in all forest types. Apparently, these generalists can quickly respond to increased densities of upper story exposed cocoons and thus limit the population growth of the pine sawfly.
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