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230 A. Lillehammer Fig. 25. Distribution of Arcynopteryx compacta (Mc Lachland).• Records from Sweden and Fin land. The Alpine areas are dotted. Fig. 27. Distribution of Diura nanseni (Kempney). Fig. 26. Distribution of Diura bicaudata (Linne). Fig. 28. Distribution of Perlodes dispar (Rambur). • The southernmost records in Sweden and Fin • The northernmost records in Sweden. land.
Norwegian stoneflies II 231 species also seem to differ in habitat preference from area to area in Norway and from that indicated by Brinck and Ulfstrand. Brinck (149) mentioned Leuctra hippopus, Leuctra nigra, Capnia bifrons and N emoura flexuosa as eucoenic in small streams. Ulfstrand (1968) found that Amphinemura sulcicollis, Leuctra hippopus, Leuctra digitata and Dinocras cephalotes were more abundant in or even restricted to smaller watercourses, while Amphinemura borealis, Leuctra fusca and Isoperla obscura tended to avoid or be sparse in small streams. However, Isoperla obscura has also been reported from large rivers in the Netherlands, Switzerland and in the Tyrol (Brinck 1949). In the following the distribution and observed habitat preference of the various species will be presented. Fam. Perlodidae Arcynopteryx compacta occurs in all parts of the country (Fig. 25). The species was mainly taken in Alpine areas. In southern Norway the lowest locality was 700 m a.s.l. at Haldagsenoyri, Atna. In the north Arcynopteryx compacta occurs at all altitudes and in lakes, outlets and in streams of different sizes. The species occurs in the same types of habitats as the Diura species. In the south it has only been taken in running waters at higher altitudes where it is the most common carnivorous species. Localities in which it has been taken range from about 700 to 1465 m a.s.!. In Fig. 33 localities are plotted which indicate the distribution trend in Fennoscandia. Diura bicaudata occurs all over the country (Fig 26), in the north in small and large streams, lakes and lake outlets. The species is most numerous and is the dominant carnivore in all the investigated biotopes in the Pasvik area which lie within the Sub-Arctic and Boreo-montane sub-zones. This area seems to contain the environmental factors nearest to the optimum for this species. In southern Norway it only occurs in lakes, mostly in high altitude lakes in the Sub-Alpine and Low-Alpine belts, but it may also be numerous in large lowland lakes such as Mjosa and Sperillen. The highest locality was about 1500 m a.s.l. Finnmark seems to be the central area for this species. In Sweden the species is a relict in some southern lakes (Brinck 1949). Diura nanseni (Fig. 27) is the most widespread carnivorous species in Norway. The species has been taken in the same habitats as Diura bicaudata in the north, but it is not as common as Diura bicaudata in Pasvik and Kautokeino. In the south Diura nansell,i is the dominant carnivorous stonefly of all types of running water below the Low-Alpine vegetation belt. The species is absent from the low coastal areas of south-western Norway, although in the inner fjords it has been taken from sea level to 900 m a.s.l. in the Low-Alpine vegetation belt. The highest record is 1300 m a.s.!. at 0vre Heimdal. Generally Diura nanseni is most common within the coniferous forest areas and in the Sub Alpine belt. According to Brinck (1949) this species has not been taken south of lake Viittern in Sweden. Perlodes dispar (Fig. 28) has only been found in three localities, all in the southeastern part of Norway. The northernmost find is from Sorkedalselven, Oslo, where the nymphs were taken from unstable substratum. In Sweden the species is mainly distributed in the southern parts (Brinck 1949). Isogenus nubecula (Fig. 29) has a wider distribution and has been taken as far north as in Tufsinga (700 m a.s.l.), North Hedmark. The only locality where the species is numerous is on stony substratum in the river Glama south of Kongsvinger. In Fennoscandia this species seems to have an eastern distribution and has been taken in northern Finland (Meinander 1965). The species is absent in the southern parts of Sweden (Brinck 1949). Isoperla difformis (Fig. 30) occurs sporadically in both northern and southern Norway. It is only in the inner fjord area of the Oslofjord that the species seems to be common, and it seems to prefer places where there is some silting or fine substrata beneath the stones. It has only once been taken in western Norway. The highest situated stream where the species was taken was at about 700 m a.s.l. In southern Norway it was taken only in running water within the Boreal pine
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Dry Weight , mg. Fig. 7. Correlatio
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Table 11. Caloric values per g dry
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Talbe IV. Oxygen consumption given
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etween the sexes during the respira
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128 A. Fjellberg Fig. 2. A. sefiten
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130 A. Fjellberg HABITATS Until now
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132 L. Semme the autumn. The prelim
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136 J. E. Brittain Fig. 1. The loca
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138 J. E. Brittain period was longe
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140 J. E. Brittain Table 11. Ph~sic
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142 J. E. Brittain Table IV. Physic
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144 J. E. Brittain EPHEMEROPTERA Am
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146 J. E. Brittain 0-3 NYMPHS I I 1
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148 J. E. Brittain 1-3 NYMPHS 01 I
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150 J. E. Brittain Nemzlrella picte
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152 J. E. Brittain ture and the inc
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(Nord-Norwegen) (Trichoptera, Pleco
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from anoxia. Drops of haemolymph we
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Notes on little known spiders in No
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Symphyla and Pauropoda from two con
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Symphyla and Pauropoda 163 Table 11
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sults it is clear that the animals
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168 7. R. Nielsen K L M N Fig. l. O
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170 T. R. Nielsen Table 1. A compar
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Abundance and diversity in the faun
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Nocturnal moths 175 Table 1. Number
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Nocturnal moths 177 Grimstad Amli 1
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Page 80 and 81: 194 F. E. Klausen REFERENCES Ardii,
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Page 142 and 143: SHORT COMMUNICATIONS C. van Achterb
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