Effects of habitat fragmentation: increased isolation and reduced habitat size reduces the incidence of dead wood fungi beetles in a fragmented forest landscape

Negative effects of habitat fragmentation (increased isolation and reduced habitat sine) affected presence of several beetle species inhabiting Fomes fomentarius; (L.) Kicks basidiocarps in a fragmented forest landscape. At t he scale of individual trees (tree level), incidence of Cia jacquemarti Mel l./C. nitidus) (F.) (not distinguished between individuals of these two spe cies, abbreviated C. jacquemarti Mell./C. bidentatus (Ol.), C. lineatocribr atus Mell., Ennearthron cornutum (Gyll.) (all Coleoptera, Cisidae) and Dorc atoma dresdensis Herbst (Coleoptera, Anobiidae) was reduced with increased habitat isolation and reduced habitat size. Additionally, increased habitat size at a larger scale (forest island level) also gave higher incidence of all species. Some of the microhabitat variables measured influenced upon the presence of the study species. Fallen trees had a higher probability of C. jacquemarti /nitidus presence than standing trees, whilst the opposite was the case for C. bidentatus. There was also increased incidence of C. bidentatus on tree s in denser forests and of E. cornutum grey alder Alnus incana compared wit h birch trees (Betula spp.). Increased volume of basidiocarps on a tree res ulted in a higher number of individuals of C. jacquemarti/nitidus and C. li neatocribratus.