A total of 57 134 individuals of 381 saproxylic beetle species
of 52 families emerged from 378 logs (+13 NA) investigated
in 2010 and from 725 logs (+24 NA) investigated
in 2011. An analysis of all local worth parameters across
the 13 tree species indicated that saproxylic beetles overall
preferred logs of Carpinus betulus (indicated by significantly
higher worth values compared to all other tree species,
with P < 001 in a multiple post hoc test; Fig. 3a)
and tended to avoid logs of Fraxinus excelsior, Pseudotsuga
menziesii, Larix decidua and Tilia sp. (indicated by significantly
lower worth values compared to most other tree
species, with P < 005 in a multiple post hoc test and by
non-overlapping notches with most others; Fig. 3a). This
pattern was more pronounced when we restricted the
analyses to either broadleaf or conifer specialists. Broadleaf
specialists clearly only preferred Carpinus betulus and
avoided conifer species, with the exception of Pinus sylvestris
(Fig. 3b). Conifer specialists clearly preferred only
Picea abies (Fig. 3c) and avoided all broadleaf trees, with
the exception of Prunus avium. A generalized linear mixed
effects model revealed a strong effect of tree species, but