Effects of habitat fragmentation: increased isolation and reduced habitat size reduces the incidence of dead wood fungi beetles in a fragmented forest landscape
Аннотация:Negative effects of habitat fragmentation (increased isolation and reduced habitat size) affected presence of several beetle species inhabiting Fomes fomentarius (L.) Kickx basidiocarps in a fragmented forest landscape. At the scale of individual trees (tree level), incidence of Cis jacquemarti Mell./C. nitidus (F.) (not distinguished between individuals of these two species, abbreviated C. jacquemarti /nitidus), C. bidentatus (Ol.), C. lineatocribratus Mell., Ennearthron cornutum (Gyll.) (all Coleoptera, Cisidae) and Dorcatoma 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 trees in denser forests and of E. cornutum in grey alder Alnus incana compared with birch trees (Betula spp.). Increased volume of basidiocarps on a tree resulted in a higher number of individuals of C. jacquemarti / nitidus and C. lineatocribratus.
