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Studies on the lentic Ephemeroptera and Plecoptera of Southern Norway JOHN E. BRITTAIN Brittain, J. E. 1974. Studies on the lentic Ephemeroptera and Plecoptera of Southern Norway. <strong>Norsk</strong> ent. 7idsskr. 21, 135-154. The Ephemeropteran and Plecopteran faunas of lentic habitats ranging from 9 to 1448 m a.s.1. in four areas of southern Norway - Finse, Heimdalen, Vassfaret and the Oslo region - were investigated with respect to species composition and abundance. Environmental parameters, such as water chemistry and temperature, are considered in relation to the observed distributions. In addition, life-cycle data are presented for Ameletus inopinatus, Siphlonuru slacustris, Baetis macani, Centro@- tilum luteolum, Cloeon dipterum, C. simile, Heptagenia fuscogrisea, Leptophlebia marginata, L. vespertina, Caenis horaria and C. moesta (Ephemeroptera), and for Amphinemura sulcicollis, Nemoura avicularis, N. cinerea, Nemurella picteti and Leuctra fusca (Plecoptera). J. E. Brittain, Zoological Museum, University of Oslo, Sarsgt. 1, Oslo 5, Norway. The aim of this study was primarily twofold; to study the distribution and abundance of lentic Ephemeroptera and Plecoptera in contrasting areas of southern Norway, and to obtain information on the life cycles of different s~ecies. In addition, since little ecological work has been published on the Norwegian lentic Ephemeropteran and Plecopteran faunas, it is hoped that the present investigation will provide a basis for further studies- and possibly indicate aspects worthy of more detailed investigation. A number of taxonomic studies. distribution records, and check lists have been published concerning the Norwegian species (e.g. Bengtsson 1909, 1928, Brekke 1938, 1965, Lillehammer 1967, 1972, I974a, Brittain 1972a and Dahlby 1973). During the last ten years a number of ecological studies from lotic habitats, principally in western Norway, have been carried out (Elliott 1965, Lillehammer 1965, 1966, 1974b, Larsen 1968 and Steine 1972)). From lentic habitats there has been little published information. One of the few studies is that of Grimeland (1966a, b), who investigated the mayfly fauna of a group of freshwater habitats in the county of South Trendelag with special reference to their distribution and the length of the adult stages. Some data are also available from wider limnological studies (e.g. 0kland 1964). Lillehammer (197413) surveys Plecoptera recorded from lentic localities in different parts of Norway. STUDY AREAS The geographical position of the four contrasting study areas - Finse, Heimdalen, Vassfaret and the Oslo region - is shown in Fig. 1. Scientific investigations under the auspices of the International Biological Programme (IBP) were already in progress in the first three areas and the vresent studies were carried out in co-operation with these projects. In the fourth area, the Oslo region, a number of the localities were or had been under investination. " some in connection with limnological studies, others being the subject for parasitological research.
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Page 6 and 7: Dry Weight , mg. Fig. 7. Correlatio
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Page 36 and 37: 150 J. E. Brittain Nemzlrella picte
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Spinosellina forms of Sminthurides
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A constant pressure microrespiromet
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Microrespirometer 189 termination o
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192 F. E. Klallsen The specimens fr
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194 F. E. Klausen REFERENCES Ardii,
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196 A. Lillehammer present in Norwa
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198 A. Lillehammer Results The numb
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Z 0 ...... ~ '"s' '" ~ .... '.xl ~
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228 A. Lillehammer Fig. 22. Stream
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238 A. Lillehammer high altitude la
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244 A. Lillehammer streams and rive
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246 A. Lillehammer Blies (1953, 195
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248 A. Lillehammer streams are to a
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250 A. Lillehammer Muller, K. 1955.
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252 Bokanmeldelser produserende, en
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N orsk Entomologisk Tidsskrift Norw
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