Atmospheric trace element deposition: principal component analysis of ICP-MS data from moss samples

Data from a Norwegian survey on atmospheric deposition, including 33 elements in 495 moss samples collected in 1990, are presented. The biomonitor moss used was Hylocomium splendens, and the analyses were carried out by ICP-MS. Principal component analysis is used to identify possible sources of the elements determined in the mosses. Dominant factors represent long-range atmospheric transported elements (Bi, Pb, Sb, Mo, Cd, V, As, Zn, Tl, Hg, Ga), windblown mineral particles (Y, La, Al, Li, U, Th, Ga, Fe, V, Cr), local emission sources (Ni, Cu, Co, and As; Zn, Cd, and Hg; Fe, Cr, and Al), transport from the marine environment (Mg, B, Na, Sr, Ca), and contribution from higher plants (Cs, Rb, Ba, Mn). Comparison of the results with similar surveys from 1977 and 1985 show a decreasing contribution of most long-range transported elements to southern Norway.     

Practical experience with the management of a cholera outbreak in a refugee cAMP in eastern Sudan, 1985

From May to November 1985 most refugee camps in Eastern Sudan were affected by cholera. This article summarizes the experience from the refugee camp Wad Sherife with the emphasis on the practical aspects of management of cholera in a refugee context. Paramedical personnel from the refugee community were used to a great extent both in curative and preventive measures. The home visitors played an important role in the early detection of the cases and in trying to prevent the spread of cholera in the camp. A total of 1793 cases were admitted during a three month period. The results show a case fatality rate of 1.8%. A significantly higher number of women were affected in the age group 15–44. As seen in other refugee camps in Eastern Sudan, there was a relatively high intravenous fluid consumption with an average of about 6 litres in adults.     

Baseline survey of concentrations of toxaphene congeners in fish from European waters

The European Union project "Investigation into the monitoring, analysis and toxicity of toxaphene"(MATT) began in 1997 involving participants from the Netherlands, Ireland, Norway and Germany. Concentration information, analytical methodology and statistical interpretation of 207 samples covering 23 different fish species from European waters are presented for three toxaphene indicator congeners: CHBs 26, 50 and 62 (CHB = chlorobornane). Concentrations for the Sigma3CHBs were more elevated in fish from more northern latitudes, such as the Barents and Norwegian Sea, compared to fish from Irish, Dutch and German waters. Concentrations were lowest in shellfish and in fish species having low lipid content and were highest in medium/high lipid species. Females from a number of fish species were shown to contain significantly higher concentrations than those observed in male fish. Overall no samples were shown to exceed existing German MRL legislation, with only one Greenland halibut sample shown to exceed Canadian TDI recommendations.     

Growth patterns of Amphiura filiformis support the hypothesis of organic enrichment in the Skagerrak-Kattegat area

Population size structure, abundance and biomass of the burrowing ophiuroid Amphiura filiformis were measured in the period 1970 to 1989 at three widely spaced sites at 55 to 100 m depth in the Skagerrak-Kattegat area. This species is a dominant component of the fauna in the area, and also one of the species accounting for a great part of a recent general increase in benthic biomass. Abundance at two of the sites and biomass at all three sites increased significantly with time from the 1970s onwards. Maximum individual size and growth of the cohort of adults showed a marked increase in the period 1980 to 1983 at the three sites. In the 1980s annual absolute growth increments of the recruits were clearly greater than in the 1970s, and size-specific growth rates were virtually unchanged. These results are consistent with the hypothesis that recent increases in benthic biomass in this area result from increased input of food to the benthos. A. filiformis has the potential for rapid growth; estimated maximum weight-specific growth rates were more than 1.5% d^-1 in the disc diameter interval 3 to 9 mm, which is comparable to rates found in shallow water filtering bivalves. The maximum disc diameter growth rate was ca. 0.4 mm mo^-1.     

Responses to projected changes in climate and UV-B at the species level

Environmental manipulation experiments showed that species respond individualistically to each environmental-change variable. The greatest responses of plants were generally to nutrient, particularly nitrogen, addition. Summer warming experiments showed that woody plant responses were dominant and that mosses and lichens became less abundant. Responses to warming were controlled by moisture availability and snow cover. Many invertebrates increased population growth in response to summer warming, as long as desiccation was not induced. CO2 and UV-B enrichment experiments showed that plant and animal responses were small. However, some microorganisms and species of fungi were sensitive to increased UV-B and some intensive mutagenic actions could, perhaps, lead to unexpected epidemic outbreaks. Tundra soil heating, CO2 enrichment and amendment with mineral nutrients generally accelerated microbial activity. Algae are likely to dominate cyanobacteria in milder climates. Expected increases in winter freeze-thaw cycles leading to ice-crust formation are likely to severely reduce winter survival rate and disrupt the population dynamics of many terrestrial animals. A deeper snow cover is likely to restrict access to winter pastures by reindeer/caribou and their ability to flee from predators while any earlier onset of the snow-free period is likely to stimulate increased plant growth. Initial species responses to climate change might occur at the sub-species level: an Arctic plant or animal species with high genetic/racial diversity has proved an ability to adapt to different environmental conditions in the past and is likely to do so also in the future. Indigenous knowledge, air photographs, satellite images and monitoring show that changes in the distributions of some species are already occurring: Arctic vegetation is becoming more shrubby and more productive, there have been recent changes in the ranges of caribou, and "new" species of insects and birds previously associated with areas south of the treeline have been recorded. In contrast, almost all Arctic breeding bird species are declining and models predict further quite dramatic reductions of the populations of tundra birds due to warming. Species-climate response surface models predict potential future ranges of current Arctic species that are often markedly reduced and displaced northwards in response to warming. In contrast, invertebrates and microorganisms are very likely to quickly expand their ranges northwards into the Arctic.     

Nature and Nature Values in Organic Agriculture. An Analysis of Contested Concepts and Values Among Different Actors in Organic Farming

The relationship between agriculture and nature is a central issue in the current agricultural debate. Organic Farming has ambitions and a special potential in relation to nature. Consideration for nature is part of the guiding principals of organic farming and many organic farmers are committed to protecting natural qualities. However, the issue of nature, landscape, and land use is not straightforward. Nature is an ambiguous concept that involves multiple interests and actors reaching far beyond farmers. The Danish research project Nature Quality in Organic Farming has investigated the relationship between nature and organic farming. This article will focus on an expert workshop held in connection with the project that investigates the way different actors conceptualize nature. Farmers, scientists, and non-governmental organizations came together to discuss their experiences of nature and expectations of organic agriculture. From this interaction, it was clear that nature is a contested notion. Different understandings of nature exist within the three groups and there is disagreement as to whether emphasis should be given to biological qualities, production values, or experiential and aesthetic perspectives. This complexity provides a challenge to organic farming as well as to the implementation of nature considerations in general. It illustrates an underlying battle for the right to define nature and nature quality and essentially decide what organic farmers should work towards. We argue that successful implementation requires organic farmers to carefully consider what expectations they wish to meet. Optimally it is dependent on a dialog between stakeholder interest groups that allows for multivocality and pluralism.     

The adequacy of GWPs as indicators of damage costsincurred by global warming

This article looks at the ability of Global Warming Potentials (GWPs) towork as indicators of equivalence for temperature development and damagecosts. We look at two abatement scenarios that are equivalent when using100-year GWPs: one scenario reduces short-lived gases, mainly methane(CH₄); the other scenario reduces carbon dioxide (CO₂).Despite their equivalence in terms of CO₂ equivalents, the scenariosdo not result in equal rates or levels of temperature change. The disparitiescontinue as we move further down the chain of causality toward damagecosts, measured either in terms of rate of climate change or level of climatechange. Compared to the CH₄ mitigation scenario, the CO₂mitigation scenario gives present value costs 1.3 and 1.5 times higher forlevel- and rate-dependent damage costs, respectively, assuming a discountrate of 3%. We also test the GWPs for other time horizons and theconclusions remain the same; using GWP as an index to reflect equivalentclimate effects and damage costs from emissions is questionable.     

Fragile X demonstrated retrospectively in amniotic cells cultured in low folate medium

Chromosome analysis in a boy aged 10 months, with psychomotor retardation, revealed the fragile X-chromosome in lymphocytes and skin fibroblasts cultured in low folate medium (TC 199). Amniocentesis and chromosomal analysis had been carried out during pregnancy because of advanced maternal age. Review of the slides from amniotic fluid cells grown routinely in low folate medium showed the marker X in 10.6 per cent of the metaphases. Possible explanations for the appearance of the marker X in amniotic cell culture are discussed.