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Table I

Deadwood variables used for prediction of the species richness of saproxylic beetles. We used 6 diameter classes and 3 decomposition stages (see Sect. 2 for further details) (DWD: Downed Woody Debris).

Variable Explanation Theoritical range Observed range
Volume descriptors
Vddw_ij Volume of DWD of diameter class “i” and decomposition stage “j” (m3/ha) 0–16.2
Vstp_ij Volume of stumps of diameter class “i” and decomposition stage “j” (m3/ha) 0–6.85
Vsng_ij Volume of snags of diameter class “i” and decomposition stage “j” (m3/ha) 0–17.25
Diversity descriptors
Dtot1 Diversity of all deadwood pieces with a minimum diameter of 1 cm 0–54 2–25
Dddw1 Diversity of downed deadwood pieces with a minimum diameter of 1 cm 0–18 0–13
Dstp1 Diversity of stumps with a minimum diameter of 1 cm 0–18 0–10
Dsng1 Diversity of snags with a minimum diameter of 1 cm 0–18 0–2
Dtot10 Diversity of all deadwood pieces with a minimum diameter of 10 cm 0–27 0–16
Dddw10 Diversity of downed deadwood pieces with a minimum diameter of 10 cm 0–9 0–6
Dstp10 Diversity of stumps with a minimum diameter of 10 cm 0–9 0–9
Dsng10 Diversity of snags with a minimum diameter of 10 cm 0–9 0–2
Dtot15 Diversity of all deadwood pieces with a minimum diameter of 15 cm 0–18 0–11
Dddw15 Diversity of downed deadwood pieces with a minimum diameter of 15 cm 0–6 0–4
Dstp15 Diversity of stumps with a minimum diameter of 15 cm 0–6 0–6
Dsng15 Diversity of snags with a minimum diameter of 15 cm 0–6 0–2
Dtot20 Diversity of all deadwood pieces with a minimum diameter of 20 cm 0–9 0–5
Dddw20 Diversity of downed deadwood pieces with a minimum diameter of 20 cm 0–3 0–2
Dstp20 Diversity of stumps with a minimum diameter of 20 cm 0–3 0–3
Dsng20 Diversity of snags with a minimum diameter of 20 cm 0–3 0–2