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By B. Sigurbjörnsson (auth.), Olafur Gudmundsson (eds.)

ISBN-10: 1475753381

ISBN-13: 9781475753387

ISBN-10: 1475753403

ISBN-13: 9781475753400

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Elsevier Pub. Y. Yurtsev, B. , 1972, Phytogeography of northeastern As ia and the pro· blems of Transberingian floristic interrelations, pp. 19-54, in: "Floristics and Paleofloristics of Asia and Eastern North America," A. , Elsevier Pub. Y. 25 FACTORS AFFECTING PRODUCTION AND STABILITY OF NORTHERN ECOSYSTEMS Sturla Fridriksson Agricultural Research Institute Reykjavik, Iceland ARCTIC HABITATS The two circumpolar areas of the globe differ in distribution of landmasses and consequently in the development of terrestrial habitats.

CONCLUSIONS Arctic ecosystems are often viewed as unproductive landscapes. 5-4 mon), their low annual plant production, and small pool of nutrients with very limited nutrient cycling per year, they are amazingly productive. T. ecosystems that have been studied in detail, plants comprise 98-99% of the standing crop and 88-91% of the total system net production. 6% of the annua 1 product i on. Although these systems are plant-detritus rather than plant-herbivore dominated they still produce a considerable amount of vertebrate herbivore biomass per year.

21 Everett, K. , Vassiljevakaya, V. , and Walker, B. , 1981, Tundra and analogous soils, pp. 139-179, in: "Tundra Ecosystems: A Comparative Analysis," l. C. Bliss, Heal, O. , and J. J. , Cambridge Univ. Y. Fuller, W. , Martell, A. , Smith, R. F. , and Speller, S. , 1977, Biology and secondary production of Dicroston,x groenlandicus on Truelove lowland, pp. 437-459, in: "Truelove Low and, Devon Island, Canada: A High Arctic Ecosystem," L. C. , Univ. Alberta Press, Edmonton. Gersper, P. , Barkley, S.

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Grazing Research at Northern Latitudes by B. Sigurbjörnsson (auth.), Olafur Gudmundsson (eds.)

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