Sediment subsamples of xA cm were extracted

The relationship between the chironomids and temperature is lost after ca. AD 1988, when CorgAR most likely reached a threshold in impacting the chironomid fauna. This high accumulation in organic TH 302 in the sediment coincides with changes in the local environment, i.e., the shift to modern agriculture in the Lake Igaliku watershed. With the objective of increasing fodder production and yields, massive use of fertilizers began in the mid-1980s (250–300 kg/ha per year) in the cultivated areas around the lake (Miki Egede, personal communication). The lake also suffers from effluent loadings from the nearby winter sheep stables. This led to an unprecedented increase in nutrient availability in the lake water and enhanced phytoplankton production (Massa et al., 2012a and Perren et al., 2012). Consequently, more autochthonous organic material accumulated in the sediment and most likely induced the major change in the chironomid fauna through impact on food quality and quantity.