Field Attraction of Beetles (Coleoptera) to the Polypores Fomes fomentarius and Phellinus spp (Fungi: Aphyllophorales) in Northern Norway
[Tiltrekning av Biller (Coleoptera) i Felt til Kjukene Fornes fornentarius og Phellinus spp (Fungi: Apbyllopborales) i Nord-Norge]
Olberg, Stefan; Andersen, Johan
The attraction of saproxylic beetles to sporophores of wood-inhabiting fungi was investigated in a boreal-subalpine forest in northern Norway. Trunk-window traps were mounted on trunks of birch (Betula pubeseens Ehrhart) with sporophores of the wood-inhabiting fungi Fomes fomentarius (Fries) Kickx and fungi of the Phellinus igniarius-complex. Empty traps were used as controls. The traps caught a total of 7617 beetles of which 4805 were obligate saproxylic. Among the saproxylic species, 2261 were obligate polyporicole. The polyporicole as well as the nonpolyporicole, saproxylic beetles had a clear preference for traps on F fomentarius. Several saproxylic species showed a significant attraction towards F fomentarius, while only Abdera flexuosa (Paykull 1799) had an obvious preference for Phellinus spp. The polyporicole species Epuraea contractula J. Sahlberg 1889, Corticaria lapponica (Zetterstedt 1838) and Lordithon speciosus (Erichson 1839) were particularly numerous in traps on sporulating F fomentarius. L speciosus was also significantly attracted to traps on sporulating Phellinus spp. Some species of cisiids preferred the non-sporulating sporophores of F fomentarius (e. g Cis jacquemartii Mellie 1848) while other species did not distinguish between the sporulating and the non-sporulating sporophores. There are indications that some species have a different host or habitat preference in the northern part of their distribution areas compared with further south. In a comparison with saproxylic beetles caught in window traps in the same area, the trunk-window traps in general caught more non-floricole and less floricole individuals. The reason for this phenomenon is discussed. The role of saproxylic beetles as transmitters of fungus spores are also discussed.