. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska. Tundra ecology. 116 2. Abundance of soil fauna. Four sod cores, each cm^, were removed from points chosen at random in each study plot at 10-day intervals in 1971 and 1972. Cores were shipped to Fairbanks, where macroarthropods were re- moved by drying and heating the core under a 60-watt light bulb. Extracted specimens were preserved in alcohol until they could be counted. On 29 August 1972, a set of cores, each cm^, was taken from plots 11, 14, 15, 16, and 17. These were brought to Fairbanks where r
. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska. Tundra ecology. 116 2. Abundance of soil fauna. Four sod cores, each cm^, were removed from points chosen at random in each study plot at 10-day intervals in 1971 and 1972. Cores were shipped to Fairbanks, where macroarthropods were re- moved by drying and heating the core under a 60-watt light bulb. Extracted specimens were preserved in alcohol until they could be counted. On 29 August 1972, a set of cores, each cm^, was taken from plots 11, 14, 15, 16, and 17. These were brought to Fairbanks where replicate cores were subjected to O'Conner wet funnel extraction for Enchytraeidae and to Macfadyen high-gradient extraction for Acarina and Collembola. Each core was divided into cm depth increments to determine distribution of invertebrates with depth below the tundra surface. 3. Phenology. Following a technique used at Barrow (MacLean and Pitelka 1971), two "sticky boards" (each m), were placed level with the ground surface on each study plot. The boards were replaced at 3-day intervals. Arthropods captured on the sticky surface were identified and counted under a dissecting micro- scope. Since most arctic insects have a very short adult life-span, the distribution of "sticky board" catches through the season corresponds closely with the actual emergence of adult in- sects. The total number of captures in any plot provides an index of abundance that can be used in comparing year-to-year and between-habitat differences. Results 1. Species composition and diversity. Al though identification of the collection of Prud- hoe Bay insects is far from complete, it is obvious that species diversity is much higher at Prudhoe Bay than at Barrow. For example, collecting in one season produced 13 species of craneflies (two never before collected) at Prud- hoe Bay; collecting in many seasons at Barrow has produced only four species (Table 1). The greatest dispa
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