Distribution of early‐arriving saproxylic beetles on standing dead Scots pine trees

Abstract

1 The community composition of early-arriving saproxylic beetles on 80 standing and recently deceased Scots pine trees (Pinus sylvestris L.) was examined. 2 In total, 34 species of saproxylic beetles were found, comprising at least four welldefined groups of species identified by correspondence analysis. 3 Bark thickness, trunk/branch diameter and height above ground significantly affected community composition, with bark thickness being the most important factor. 4 Overall, 13.7% of the variance in species composition was explained by section of the tree that was sampled, a variable that encompasses the three aforementioned parameters.

Bark- and wood-boring beetles on Scots pine logging residues from final felling: effects of felling date, deposition location and diameter of logging residues

“…The number of recorded species (25) was comparable to that found on whole standing mature Scots pine trees (17 species in Finland (Väisänen et al 1993), 23 species in Poland (Zabecki 1999), and 34 species in the Czech Republic (Foit 2007(Foit , 2010). The relatively high number of species recorded in the present study might be explained by the high sun-exposure of the LRs on the clearcut area because sun-exposure favours species richness among saproxylic beetles (Bouget & Duelli 2004 (16) that was found in a similar study in the Czech Republic on shaded Scots pine LRs, which were generated by thinning (Foit 2011).…”

“…LR type had a greater explanatory power than LR diameter, possibly because LR type was more strongly correlated with unstudied variables, such as the presence or absence of needles on particular LR fragments. Substrate diameter has previously been shown to affect saproxylic beetle occurrence (Schiegg 2001, Lindhe & Lindelöw 2004, Lindhe et al 2005, Jonsell et al 2007, Maňák 2007, Jonsell 2008b, Foit 2010, Brin et al 2011. Thus, nine taxa were signifi cantly associated with LR diameter in the present study ( Table 2).…”

“…In general, the occurrence of saproxylic beetles on LRs or dead wood is affected by substrate characteristics, including substrate metric parameters, such as bark thickness (Zhang et al 1993, Foit 2010 and diameter (Schiegg 2001, Lindhe & Lindelöw 2004, Lindhe et al 2005, Jonsell et al 2007, Maňák 2007, Jonsell 2008b, Foit 2010. Sun exposure (Jonsell et al 2004, Lindhe & Lindelöw 2004, Lindhe et al 2005, Jonsell 2008b), moisture (Wallace 1953, Larkin & Elbourn 1964, decomposition stage (Wallace 1953, Vanderwel et al 2006, Jonsell 2008b and the presence of other organisms (Jonsell et al 2005, Abrahamsson et al 2008, Weslien et al 2011) are of remarkable signifi cance for the occurrence of saproxylic beetles in various substrates.…”

Ecological segregation of bark beetle (Coleoptera, Curculionidae, Scolytinae) infested Scots pine

“…These are hereafter referred to as the ''dead trees. '' In February 2009 and2010, 10 trap trees were prepared each year (a total of 20 trap trees) from the cut pines which were delimbed and placed on supports at a height enabling colonization of trunks by insects on their entire circumference (Fig. 1b).…”

“…When trees are weakened by various abiotic, biotic and anthropogenic factors, forest stands and cut trees become an important breeding base for bark beetles (Scolytinae; Dyer and Chapman 1965;Wood 1982;Jakusˇ1998a, b;Sauvard 2004;Foit 2010). When beetles attack a tree this triggers defense responses, and the level of the response depends on the degree of tree weakening (Lieutier 2004).…”