can snow depth be used to predict the distribution of the high arctic aphid acyrthosiphon svalbardicum (hemiptera: aphididae) on spitsbergen?the svalbard endemic aphid acyrthosiphon svalbardicum (heikinheimo, 1968) is host specific to dryas octopetala l. ssp octopetala (rosaceae). it has been hypothesized that the aphid is present on those areas with a thin winter snow cover and which therefore clear of snow earlier in the season. this early snow clearance results in a longer growing period and allows the aphid to experience at least the minimum number of degree days required to complete its life cycle. however, this hypothesis lacke ...201121995787
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