Ecological investigations of the tundra Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . ecologicalinvest00brow Year: 1975 122 Hymenoptero Apocrito Plot I 1971 1972 1971 1972 1971 1972 1971 1972 1971 1972 2 3 4 5 6 1972 7 1972 96 34 535 262 I 08 28 742 122 725 I 10 61 97 Homoptero: Cicadellidae 1972 1972 8 569 10 20 June 30 10 20 July 30 10 20 29 August 10 20 30 10 20 30 10 20 29 June July August Fig. 6. Seasonal distribution of 'stic/<y-board' captures of 'narrow-waisted' parasitic Hymenoptera (suborder Apocrita) in 1971 and 1972. Fig. 7. Seasonal distr
Ecological investigations of the tundra Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . ecologicalinvest00brow Year: 1975 122 Hymenoptero Apocrito Plot I 1971 1972 1971 1972 1971 1972 1971 1972 1971 1972 2 3 4 5 6 1972 7 1972 96 34 535 262 I 08 28 742 122 725 I 10 61 97 Homoptero: Cicadellidae 1972 1972 8 569 10 20 June 30 10 20 July 30 10 20 29 August 10 20 30 10 20 30 10 20 29 June July August Fig. 6. Seasonal distribution of 'stic/<y-board' captures of 'narrow-waisted' parasitic Hymenoptera (suborder Apocrita) in 1971 and 1972. Fig. 7. Seasonal distribution of 'sticky-board' captures of leafhoppers (Homoptera: Cicadelli- dae) in 1971 and 1972. these plots they declined in abundance from 1971 to 1972. Leafhoppers have gradual (in- direct, or hemimetabolic) development. Cap- tures included adults and immatures (nymphs) at various stages of development; thus, the cap- ture period is long. Year-to-year changes in number of captures may reflect differences in activity related to ambient temperature as much as actual differences in abundance. Taking the insect fauna as a whole, the lake basin plots (4 and 5) seem to be the most productive. Only the leafhoppers show a prefer- ence for the drier plots (1,3, and 7). Plots 4 and 5 tended to show a greater abundance of adult insects than the other wet plots, 2 and 6. This is strongly the case in the Tipulidae, and less so in other groups. It is interesting to note that Enchytraeidae, the only microfaunal group sampled in plots 4 and 5, were slightly more abundant there than elsewhere, but still well below the Barrow mean (Table 3). We conclude that, as at Barrow, wet plots support more invertebrate biomass than dry plots; however, biomass of the most favorable plots at Prudhoe Bay is well below biomass of the most favorable plots at Barrow. General Conclusions In general, results obtained at Prudhoe Bay support our more intensive observations at Bar- row and reinforce their validity
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