**3. Succession patterns**

Aquatic invertebrates, for instance larvae of Chironomidae midges, were sampled from

We performed extensive sampling of airborne arthropods on 3–6-year-old ground on the 2005 moraine [28]. Two types of traps were used: sticky traps and fallout traps. The sticky traps were placed on poles, up to 1-m height, and turned towards different directions. Fallout traps had their rim 5 or 11 cm above the ground to prevent surface-active arthropods to drop into

The food choice of different species was studied by analysing their gut contents under the microscope. Crop and gut contents of beetles and harvestmen were dissected out and spread on slides, embedded in glycerol. In most springtails, gut contents could be observed in ordinary slides for species identification. The large, spherical species *Bourletiella hortensis* was

**Figure 4.** Sticky traps on a 6-year-old moraine, collecting airborne invertebrates from different directions, up to 1-m

height. Inserted: open fallout trap with diameter 6.5 cm. From Ref. [28].

young ponds using a sieve. **Figure 3** shows a pond on an 8-year-old moraine.

**2.4. Sticky traps and fallout traps**

152 Glacier Evolution in a Changing World

them (**Figure 4**).

**2.5. Gut content analyses**

squeezed on the slide to spread the gut content.
