Species distribution in a mossy – dryas – sedge hummock tundra (Western Taimyr)

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Abstract
Type R principal components analyses of vascular plant, bryophyte, and lichen cover in a hummock tundra indicated the presence of more information in the pattern of the bryophytes than in the other plant groups. This was expressed as differences between the combined contributions of the first three components to the overall dispersions in the analyses of the three types of vegetation. For these values, which permit a general comparison of systems, the term "organization intensity" is introduced. The result was confirmed by the significance of correlations of the loadings of the species on the first and second components in replicate transects. The loadings of the bryophyte species on the first component correlate significantly with their position on the complex microgradient from hummock to hollow and give results that are less dependent on sampling methods than direct gradient analysis.

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