Table 1.

Overview of the experiments with the corresponding hypotheses, sites, and species observed

Experiment	Hypothesis	Site	Species observed
1	1, 3, 5	Sobesice	Scots pine, wild cherry, Pedunculate oak, maple
2	2	Laboratory	Scots pine, Norway spruce, Pedunculate oak
3	1, 3, 4, 5	Laboratory	Scots pine, Norway spruce, Pedunculate oak
3		Sobesice, Wilrijk	Norway spruce, maple, Pedunculate oak
3		Allschwil	European beech
4	4	Vranov	Norway spruce
5	5, 6	Wilrijk	Pedunculate oak
6	1, 5, 6	Sobesice	Pedunculate oak, European ash, Scots pine
6		Brislach, Allschwil	European beech, Norway spruce
7	5, 6	Chriby	European beech
8	6	Zürich	Norway spruce