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We studied the relative importance of several environmental factors for tundra plant communities in five locations across Svalbard (High Arctic) that differed in geographical location, oceanographic and climatic influence, and soil characteristics. The amount of marine-derived nitrogen in the soil supplied by seabirds was locally the most important of the studied environmental factors influencing the tundra plant community. We found a strong positive correlation between  δ  15 N isotopic values and total N content in the soil, confirming the fundamental role of marine-derived matter to the generally nutrient-poor Arctic tundra ecosystem. We also recorded a strong correlation between the  δ  15 N values of soil and of the tissues of vascular plants and mosses, but not of lichens. The relationship between soil  δ  15 N values and vascular plant cover was linear. In the case of mosses, the percentage ground cover reached maximum around a soil  δ   15 N value of 8‰, as did plant community diversity. This soil  δ  15 N value clearly separated the occurrence of plants with low nitrogen tolerance (e.g.  Salix polaris ) from those predominating on high N content soils (e.g.  Cerastium arcticum ,  Poa alpina ). Large colonies of planktivorous little auks have a great influence on Arctic tundra vegetation, either through enhancing plant abundance or in shaping plant community composition at a local scale.

Importance of Marine-Derived Nutrients Supplied by Planktivorous Seabirds to High Arctic Tundra Plant Communities