The Swiss School of Engineering for the Wood Industry

The Swiss School of Engineering for the Wood Industry is situated between the residential areas on the outskirts of the city of Biel and the industrial zones flanking the southern slopes of the Jura. The existing buildings consist mostly of single-storied production halls and storage sheds which, with their open layout, low-pitched roofs and close rapport with the surrounding landscape, are typical of school buildings of the post-war period in Switzerland

Nonlinear temperature response of lake ice breakup

A uniquely comprehensive set of four decades of ice breakup data from 196 Swedish lakes covering 13degrees of latitude (55.7degrees N to 68.4degrees N) shows the relationship between the timing of lake ice breakup and air temperature to be an arc cosine function. The nonlinearity inherent in this relationship results in marked differences in the response of the timing of lake ice breakup to changes in air temperature between colder and warmer geographical regions, and between colder and warmer time periods. The spatial and temporal patterns are mutually consistent, suggesting that climate change impacts on the timing of lake ice breakup will vary along a temperature gradient. This has potentially important ramifications for the employment of lake ice phenologies as climate indicators and for the future behavior of lacustrine ecosystem

Buried Paleosols as Reference Objects for Assessing the Current Level of Soil Pollution with Lead in the Lower Volga Steppes

The estimation of soil contamination with anthropogenic lead requires uncontaminated analogues of the recent soils for comparison. For this purpose, a paleosol buried under a 2-m high burial mound of the Bronze Age and protected by it from atmospheric deposition during 4500 years was studied. The content and isotopic composition of mobile and total lead in the buried and recent soils (roadside and remote from lead sources) were compared. Obvious signs of anthropogenic contamination were revealed in only the upper layer of the roadside soil within 10 m from a highway. These were an increase in the absolute content of all lead forms; a high relative content of mobile forms; high ratios of Pb relative to Ti, Zr, and Y; and the similarity between isotopic compositions of the soil lead and the lead from modern atmospheric aerosols and Russian gasoline. Interestingly, no significant difference was found in the total lead contents or in the isotopic compositions between the recent soil remote from roads and the buried soil. However, some signs of anthropogenic impact could be revealed by the analysis of mobile lead forms, which make up a small portion of the total content

Total mercury and methylmercury contents of insects from boreal lakes: ecological, spatial and temporal patterns. Water Quality Research

Mercury (Hg) and methylmercury (MeHg) concentrations in insects from 19 lakes in Quebec (Canada) and Sweden ranged from <25 to >550 ng Hgg-1 dry weight (dw). The mean proportion of MeHg to total Hg concentrations depended on the feeding behaviour of the animals, increasing from 35-50% in detritivoresgrazers (dipterans, ephemeropterans, trichopterans) to 70-95% in predators (heteropterans, coleopterans, odonates). These differences were attributed to the biomagnification of MeHg in the food web since the MeHgJtotal Hg ratio in the organisms was not related to their body size. A large part of the overall variability of total Hg (r2=0.57, p=0.0001) and MeHg (r2=0.79, p=0.0001) concentrations in insects was explained by taxonomic differences, probably related to feeding behaviour, and the differences between lakes. MeHg concentrations in chironomids and in odonates were significantly correlated with sediment MeHg contents (r=0. 78, p=0.005; r=0.62, p=0.001, respectively). However, our results suggest that animal feeding behaviour and the quality of ingested food are more important in determining MeHg accumulation in insects than either MeHg contents of sediment or atmospheric Hg deposition rates. Our data indicate that the bioavailability of Hg to the lower trophic levels of the food web is determined by abiotic factors and controls contamination of predators at the top of the food chain. Total Hg concentrations in insects increased from spring to fall, from 60-80 ng Hgg-1 dw to 125-175 ng Hgg-1 dw in the detritivore-grazer taxa, and from 88-120 ng H g g l dw to 180-200 ng Hgg-1 dw in the predator taxa. MeHgItotal Hg ratios showed little variability from spring to fall and the increase of Hg and MeHg concentrations in insects seemed to be related to enhanced methylation resulting from the rise of water temperature and to the variations in the nature of the food ingested. attribuee h la bioamplification du MeHg dans la chaine trophique, puisque la proportion de MeHg:Hg dans les organismes n'est pas relike h leur taille. Une grande proportion de la variabilitk totale des concentrations en Hg total (r2=0,57, p=0,0001) et en MeHg (r2=0,79, p=0,0001) des insectes, peut Ctre attribuee aux differences taxonomiques, qui sont relikes h leur mode d'alimentation et aux diffhrences entre les lacs. Des correlations ont Cte obtenue entre les concentrations de MeHg dans les sediments et celles des chironomides (r=0,78, p=0,005) et des odonate