. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . Stondmg Woter [ponds,lokesl [7] (6] Carex aquatilis (morsh) [5] [4l Eriophorum ongustifolium (morsh) [31 Dryas integrifolia (heath) [3] [2] Sof'x rotundifolia (snowbed) [9] Dupontio fisheri (brook meadow) [12] Brook or Creek [ ] Vegetation type- Webber/Walker Scheme - Increosinq Wetness- were distinguished using Sorensen's index of similarity: 's =â a+b where a is the number of plant species in a stand of vegetation with a constancy >50; b is the equivalent value for the compared stand; c is the numb
. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska . Stondmg Woter [ponds,lokesl [7] (6] Carex aquatilis (morsh) [5] [4l Eriophorum ongustifolium (morsh) [31 Dryas integrifolia (heath) [3] [2] Sof'x rotundifolia (snowbed) [9] Dupontio fisheri (brook meadow) [12] Brook or Creek [ ] Vegetation type- Webber/Walker Scheme - Increosinq Wetness- were distinguished using Sorensen's index of similarity: 's =â a+b where a is the number of plant species in a stand of vegetation with a constancy >50; b is the equivalent value for the compared stand; c is the number of shared species. The mean index of similarity between stands within types was (SD = ) and between vegetation types (SD = ). The vegetation types correspond to the criteria of associations, but a formal classifi- cation was not attempted due to lack of data on the cryptogams. Vegetation types were named after the dominant species in each type. Vegetation distribution in the study area was surveyed in four ground transects covering the land area between lakes. Lakes and sand dunes were recognized from aerial photographs and maps, and their distribution assessed in five map transects. The results of the ground transects are shown in Table 8, and the combined ground and aerial transects, in which free-water cover was deleted, is shown in column 8 of Table 8. Also shown in Table 8 are the same vegetation types with their appropriate designation, according to Webber's vegetation map for Prudhoe Bay (this volume). Caribou grazing patterns and dispersion (a) Caribou preference for vegetation types. Groups of caribou were observed for 10 min
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