At the Pingorsuit Glacier in North-West Greenland, an organic-rich deposit that had recently emerged from retreating ice cap was discovered at elevation of 480 m above sea level. This paper reports on macrofossil analyses a coarse detritus gyttja and peaty soil, which occurred beneath thin cover till glacifluvial deposits. The sediments contained remains vascular plants, mosses, beetles, caddis...

We investigated the effect of grazing by a dominant invertebrate grazer (the caddisfly Glossosoma penitum) on the energy sources used by other consumers in a headwater-stream food web. Stable isotope studies in small, forested streams in northern California have shown that G. penitum larvae derive most of their carbon from algae, despite low algal standing crops. We hypothesized that the caddis...