. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska. Tundra ecology. 185 Vegetation Type {Webber's Classification) Relative Degree of Insect Relief go Availability40 - (% of Area)20 0 Ijl vitro 60 Digestibility 40 § §. (16) (2,9) (12) (3,4) (5) i ///I m vn^ (%) Ffeok Biomass (g m-2) Biomass Ratio (Live/Dead) Relative Preference Index (R) n. n n n EZL n Increosing Wetness of Habitat [R = Availability x Digestibilityx Biomass » (Live/Dead)] Fig. 14. Summary of relative characteristics of vegetation types wliicli appear pertinent to cari- bou fiabitat at Prudfioe Bay
. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska. Tundra ecology. 185 Vegetation Type {Webber's Classification) Relative Degree of Insect Relief go Availability40 - (% of Area)20 0 Ijl vitro 60 Digestibility 40 § §. (16) (2,9) (12) (3,4) (5) i ///I m vn^ (%) Ffeok Biomass (g m-2) Biomass Ratio (Live/Dead) Relative Preference Index (R) n. n n n EZL n Increosing Wetness of Habitat [R = Availability x Digestibilityx Biomass » (Live/Dead)] Fig. 14. Summary of relative characteristics of vegetation types wliicli appear pertinent to cari- bou fiabitat at Prudfioe Bay. Relative degree of insect relief is a subjective assessment; avail- ability, see Table 8; in vitro digestibility, see Table 19; peak biomass, see Table 12 (live biomass); biomass ratio, calculated as ratio of live/dead, including litter at peak live biomass, see Table 12); relative preference index of herbage was calculated as the product of avail- ability of community type, in vitro digestibility, peak biomass and ratio of live/dead. when energy is available for growth and fatten- ing, low survival might be expected. Late July and August productivity would be higher if caribou followed the phenologic and primary production progression in vegetation types from south of the Prudhoe Bay study area into the foothills of the Brooks Range. This strategy might explain the adaptive significance of ob- served migration patterns of caribou, but why a small herd remains resident in the Prudhoe Bay area is less easily explained. Acknowledgements This project was supported by Grant No. GB-29342 to the University of Alaska under the auspices of the U. S. Tundra Biome Program from the Office of Polar Programs and the International Biological Program of the National Science Foundation. Logistic support at Prud- hoe Bay was made available through the Tundra Biome Center, University of Alaska, from funds provided by the Prudhoe Bay Environmental Subcommittee; the Naval Arctic Research Labo
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