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Preface; S. Sandoy. 1. Introduction to the Atna Research Area; A.M. Tvede, G. Halvorsen. The Atna Watershed. 2. The climate of Atndalen; P.O. Nordli, A.A. Grimines. 3. Hydrology of Lake Atnsjoen and River Atna; A.M. Tvede. 4. Erosion and sediment yield in the Atna river basin; J. Bogen. 5. Fish distribution of a mountain area in southeastern Norway: human introductions overrule natural immigration; T. Hesthagen, O.T. Sandlund. Atna River. 6. Periphyton in running waters - long term studies of natural variation; E.A. Lindstrom, S.W. Johansen, T. Saloranta. 7. Studies of aquatic insects in the Atna River 1987-2002; K. Aagaard, J.O. Solem, T. Bongard, O. Hanssen. 8. Age and growth of Siberian sculpin (Cottus poecilopus) and young brown trout (Salmo trutta) in a subalpine Norwegian river; T. Hesthagen, O. Hegge, J. Skurdal, B.K. Dervo. 9. Niche overlap between young brown trout (Salmo trutta) and Siberian sculpin (Cottus poecilopus) in a subalpine Norwegian river; T. Hesthagen, R. Saksgard, O. Hegge, B.K. Dervo, J. Skurdal. Lake Atnsjoen. 10. Some physical and chemical characteristics of Lake Atnsjoen; G. Halvorsen. 11. Phytoplankton of Lake Atnsjoen, Norway - a long-term investigation; P. Brettum, G, Halvorsen. 12. Zooplankton of Lake Atnsjoen 1985-1997; G. Halvorsen, B.K. Dervo, K. Papinska. 13. Annual variability of the life-history characteristics of brown trout (Salmo trutta) and Arctic charr (Salvelinus alpinus) in a subalpine Norwegian lake; T. Hesthagen, T.Forseth, O. Hegge, R. Saksgard, J. Skurdal. 14. A 14-year study of habitat use and diet of brown trout (Salmo trutta) and Arctic charr (Salvelinus alpinus) in a subalpine Norwegian lake; R. Saksgard, T. Hesthagen. Perspective. 15. Long-term monitoring and research in an alpine-boreal watershed: Atndalen in perspective; O.T. Sandlund, K. Aagaard.
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