Ivar Pors Muniz

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Stream- and soilwater at the 18.7 ha pristineIngabekken catchment, on gneiss bedrock at Høylandet,have been studied for three years, including intensiveepisode studies in spring and autumn. The site mainlyconsists of blanket bogs which are typical for thesemarine west coast climates. Water drains through theblanket peats by means of two major flowpaths.(More)
Acid rain is an increasing environmental problem in China. At present SO2 emission is about 20±22 million tons. However with a growing number of large power plants the long-range transport of air pollutants is expected to increase. The highest acid deposition is near the emission sources. Wind-blown, alkaline soil dust is important in neutralizing the(More)
The surface water chemistry of Høylandet has beenstudied by performing two synoptic surveys, duringhigh runoff in the autumn of 1986 and during a lowflow period in the summer of 1988. Based on watersamples of up to 38 chemical variables from 75 sites,analyses show considerable variation in the chemicalcomposition. There is a strong altitude gradient,(More)
Food consumption, growth, fish length distributions,population sizes and habitat use of the salmonids intwo lakes in the Høylandet area were studied in1986–89. The allopatric brown trout (Salmotrutta L.) in the tarn Røyrtjønna (27 ha) fed mainlyon organisms at the lake surface , crustaceanplankton, Trichoptera and Chironomidae. Only 5% ofthe trout reached(More)
The research activities on soil–freshwaterinteractions and freshwater biotic structure andprocesses in the Høylandet area during the years 1986–89are presented in this issue ofHydrobiologia. The 9 papers cover a range of topicsfrom physiochemical gradients and processes in soilsand freshwaters to selected aspects of freshwaterbiotic community structure and(More)
The present study focuses on the effect of temperature on Al-chemistry and the subsequent toxicity to smoltifying Atlantic salmon, Salmo salar. Fish were exposed to acidic Al-rich water at different temperatures, and mortality, ventilation frequency and various blood parameters were measured. The relationship between temperature and Al-toxicity was(More)
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