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The fauna of the exposed zone of Øvre Heimdalsvatn: Methods, sampling stations and general results
Twenty stations were sampled monthly during the ice free period (June-September) in 1972. Emergence traps, emptied daily, were also employed. The major macroinvertebrates in the exposed zone wereExpand
The lake ecosystem of Ovre Heimdalsvatn
The Norwegian subalpine lake. Ovre Heimdalsvatn, has a surface area of 0.78 km2 and a maximum depth of 13 m. It is ice-covered for 7.5–8 months, has a marked spring spate and a mean annual renewalExpand
Zoogeographical studies on Fennoscandian stoneflies (Plecoptera)
Forty species of stoneflies, belonging to seven different families, occur in Fennoscandia. In Norway all these families are represented in the inner fjord areas and in the continental lowland. TheExpand
The Trichoptera of Øvre Heimdalsvatn
Trichopteran larvae were sampled on soft substrata at all depths, on stony substrata in the exposed zone, and the adults in emergence traps, placed along the lake shore. Fourteen species were takenExpand
The Plecoptera of Øvre Heimdalsvatn
The stonefly fauna was studied in the exposed zone and on soft bottom in deeper waters. Emergence was recorded by traps. Ten species were found. All were recorded in the exposed zone. Diura bicaudataExpand
Diapause and quiescence in eggs of Systellognatha stonefly species (Plecoptera) occuring in alpine areas of Norway
Eggs of the stoneflies Diura bicaudata and Arcynopteryx compacta, occurring in the middle-alpine vegetation belt, and Dinocras cephalotes not recorded above the sub-alpine, reacted differently to theExpand
Intraspecific variation in the biology of eggs and nymphs of Norwegian populations of Leuctra hippopus (Plecoptera)
The duration of the egg incubation period, the hatching success and nymphal growth of three local Norwegian populations of Leuctra hippopus Kempney in relation to temperature were studied in theExpand
Studies on egg development in the Fennoscandian Isoperla species (Plecoptera)
Three species of Isoperla occur in Fennoscandia. The most common is /. grammatica, although it has not been recorded above the subalpine vegetation belt. /. difformis has a similar distribution, butExpand
Variability In the rate of egg development of the stonefly, Nemoura cinerea (Plecoptera)
SUMMARY. 1. The egg development of the widely distributed European stonefly. Nemoura cinerea Retzius. was investigated in the laboratory. There was a significant relationship between waterExpand