132 research outputs found
Metal levels in an epiphytic lichen as indicators of air quality in a suburb of Helsinki, Finland
Water striders (Heteroptera, Gerridae) as bioindicators of heavy metal pollution
Heavy metal contents of water striders collected near a steel factory and from control sites were analyzed by AAS. The average concentrations µg/g of dry weight found near the factory vs. the control areas were: Al 76, 65; Fe 840, 330; Mn 49, 37; Zn 310, 280; Cu 44, 42; Cd 1.6, 6.5, respectively. In most cases Ni and Pb concentrations were below the determination limit in both sites. There were significant differences between sites in the concentrations of iron and cadmium. Fifth instar larvae had higher iron content than adults, but sexes did not differ in heavy metal content. There were also significant differences between different water strider species as accumulators of zinc, aluminium and cadmium. It is concluded that water striders seem suitable as bioindicators of heavy metals
Cadmium in insects after ash fertilization
Ash fertilization of forests returns nutrients to forest ecosystems and has a
positive effect on soil pH, but it also may elevate Cd concentrations of forest biota. Cadmium
concentrations of some forest insects (Formica ants, carabids and Coleopteran larvae from
decaying wood) were investigated in southern Finland, where two plots were fertilized with
wood ash, while two other plots represented unfertilized control plots. In ants, mean Cd
concentration was 3.6 ± 1.4 mg/kg, with nest workers having significantly higher concentrations
than workers trapped in pitfall traps. Concentrations at fertilized and unfertilized
plots were similar. In carabid beetles, the average Cd concentration of Carabus glabratus
was 0.44 ± 0.36 mg/kg, with no significant difference between control plots and fertilized
plots. In another carabid beetle, Pterostichus niger, mean Cd concentration was higher at
fertilized plots compared to control plots. We conclude that the variation of Cd concentrations
in the insects studied is more efficiently controlled by species-specific differences than
fertilization history of the forest floor
Prövning av bekämpningsmedel mot skadedjur 1976
Nimekkeen selvennys: Avdelningenför skadedjursforskning.Prövning av bekämpning smedelmot skaddejur 1976 Resultat.vokKirjasto Aj-
Open digestion of some plant and fungus materials for mercury analysis using different temperatures and sample sizes
Tuhoeläinten torjunta-aineiden koetulokset 1976
Nimekkeen selvennys: 532-2 Torjunta-ainelain edellyttämät tehtävät Tutkimustuloksia vuodelta 1976.vokKirjasto Aj-
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