The lack of effect of grazing could be caused by the intense summer grazing of sheep in Iceland which is maintaining the ecosystems in a low nutrient stock, limiting the ability of these ecosystems to recover.
Þessi svæði hafa verið undir mikilli sauðfjárbeit í marga áratugi, en slíkt getur valdið hnignun vistkerfa og haft áhrif á næringarhringrás þeirra.