Full-text - Norsk entomologisk forening
Full-text - Norsk entomologisk forening
Full-text - Norsk entomologisk forening
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Norwegian stoneflies. 11. Distribution and relationship<br />
to the environment<br />
A. LILLEHAMMER<br />
Lillehammer, A. 1974. Norwegian stoneflies. n. Distribution and relationship to the<br />
environment. <strong>Norsk</strong> ent. Tidsskr. 21, 195-250.<br />
Distribution of the Norwegian stoneflies is discussed, and the species and their<br />
dependence on certain ecological factors in different parts of the country are investigated<br />
and compared. Considerable differences are present between the stonefly<br />
associations in the various areas, especially between low and high altitudes and<br />
between southern and northern Norway. There is a reduction in species in the Sub<br />
Alpine and Low-Alpine vegetation belts, paralleled by the reduction in deciduous<br />
trees and bushes, mainly Salix. This trend is apparent in both southern and northern<br />
Norway. Thirty-one species were taken in northern Norway, while in southern<br />
Norway 29 species were recorded. In both northern and southern Norway the inland<br />
areas contained the highest number of species. In the south there was a clear<br />
reduction in species towards the coast. The investigations have demonstrated that<br />
faunistic differences between the various areas of Norway are so great that previous<br />
attempts to generalize about the classification of streams are to a large extent<br />
rendered invalid.<br />
A. Lillehammer, Zoological Museum, University of Oslo, SOTS gt. 1, Oslo 5, Norway.<br />
CONTENTS Norway 219<br />
Horizontal and vertical distribution 220<br />
Introduction 195<br />
Material and methods 196<br />
The stonefly association at different<br />
Distribution of the Norwegian species .. 197<br />
stations in a stream 220<br />
Previous records and present collecting<br />
The stonefly association in Borealconiferous,<br />
Sub-Alpine, Low and<br />
routes 197<br />
Middle-Alpine belts . . . . . . . . . . . . . . .. 222<br />
Results 198<br />
Discussion 199<br />
The western area " 222<br />
Distribution in selected areas 200<br />
Eastern area 225<br />
Southern Norway 201<br />
Northern area 226<br />
Area<br />
Discussion of vertical zonations .. 227<br />
I. North Rogaland and South<br />
lIorizontal distribution of species 227<br />
lIordaland 201<br />
Area 2. The surroundings of the<br />
Discussion of zonations 229<br />
Distribution and habitat preference .. 229<br />
Oslofjord 204<br />
Stonefly habitats 244<br />
Area 3. North 0sterdalen and its<br />
The stonefly fauna of different areas<br />
surroundings 207<br />
grouped zoogeographically 245<br />
Area 4. 0vre lIeimdalen 209<br />
Distribution westwards along presumed<br />
Conclusion 247<br />
Summary 247<br />
emigration routes " 212<br />
Discussion: southern Norway 212<br />
Acknowledgements 248<br />
Northern Norway<br />
213<br />
Area 5. Kautokeino<br />
213<br />
Area 6. Alta and its surroundings .. 213<br />
INTRODUCTION<br />
Area 7. South Varanger . . . . . . . . . . .. 217 When the present studies on Norwegian<br />
Discussion: northern Norway 219 stoneflies were started in 1965, one aim was<br />
Comparison of southern and northern to find the distribution of the stonefly species
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