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  • Artikel  (400)
  • 2010-2014  (400)
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  • Artikel  (400)
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  • 11
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    Half a century of changing mercury levels in Swedish freshwater fish (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-19
    Beschreibung: The variability of mercury (Hg) levels in Swedish freshwater fish during almost 50 years was assessed based on a compilation of 44 927 observations from 2881 waters. To obtain comparable values, individual Hg concentrations of fish from any species and of any size were normalized to correspond to a standard 1-kg pike [median: 0.69 mg kg −1 wet weight (ww), mean ± SD: 0.84 ± 0.67 mg kg −1 ww]. The EU Environmental Quality Standard of 0.02 mg kg −1 was exceeded in all waters, while the guideline set by FAO/WHO for Hg levels in fish used for human consumption (0.5–1.0 mg kg −1 ) was exceeded in 52.5 % of Swedish waters after 2000. Different trend analysis approaches indicated an overall long-term decline of at least 20 % during 1965–2012 but trends did not follow any consistent regional pattern. During the latest decade (2003–2012), however, a spatial gradient has emerged with decreasing trends predominating in southwestern Sweden.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 12
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    Challenges in assessing biological recovery from acidification in Swedish lakes (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-19
    Beschreibung: Since the 1980s, Swedish lakes have in general become less acidified. Assessment of biological recovery is, however, hampered by poor pre-acidification data, confounding effects of climate change, and few lakes with annual sampling of fish and other organisms. Only three critically acidified, but non-limed, lakes had two decades of fish monitoring. The lakes had not yet recovered to pre-industrial chemical targets. Fish had low species richness compared to other organism groups. Roach ( Rutilus rutilus ) and/or European perch ( Perca fluviatilis ) were the dominant fish species, and the acid-sensitive roach had been lost from one of the lakes. Calcium decreased, possibly approaching pre-acidification concentrations, but exceeded minimum levels needed to sustain some Daphnia species. High or increasing levels of total organic carbon, likely due to reduced acidification and climate change, might influence the biological communities in unexpected ways, for example, facilitating more frequent occurrence of the invasive algae Gonyostomum semen .
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 13
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    Long-term effects on nitrogen and benthic fauna of extreme weather events: Examples from two Swedish headwater streams (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-19
    Beschreibung: Climate change is expected to cause an increased frequency of extreme events such as heavy floods and major storms. Such stochastic events have an immediate impact on surface water quality, but the long-term effects are largely unknown. In this study, we assess long-term monitoring data from two Swedish headwater catchments affected by extreme weather events. At one site, where nitrogen effects in soil water, groundwater, and stream water were studied after storm-felling and subsequent forest dieback from bark beetle attack, long-term (〉5 years) but relatively modest (generally 〈1 mg L −1 ) increases in ammonium (NH 4 -N) and nitrate (NO 3 -N) concentrations were observed in the various aqueous media. At the other site, where effects on benthic fauna were studied in a stream impacted by extreme geophysical disturbances caused by rainstorm-induced flashflood, only short-term (1 year) effects were revealed both regarding diversity and composition of species.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 14
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    Spatio-temporal trends of PCBs in the Swedish freshwater environment 1981–2012 (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-19
    Beschreibung: Polychlorinated biphenyls (PCBs) have been monitored in perch ( Perca fluviatilis ), pike ( Esox lucius ), and Arctic char ( Salvelinus alpinus ) in reference lakes since the late 1960s. Temporal trends and spatial patterns are currently monitored in nine and 32 lakes, respectively. Overall, PCB concentrations are decreasing. However, this is not consistent for all congeners across all lakes and species. Perch has comparatively low PCB concentrations relative to suggested target levels, but individual congener concentrations in some lakes are concerningly high. No temporal trend is seen for CB-118 and CB-153 in perch, but significant decreasing trends exist for Arctic char and pike, for which monitoring started earlier than for perch. The lower/higher chlorinated congener ratio decreased over time in most lakes, indicating fewer new emissions. CB-118 and CB-153 concentrations in perch show spatial gradients across Sweden, with higher concentrations found near urban/industrial areas.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 15
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    Evaluating common drivers for color, iron and organic carbon in Swedish watercourses (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-19
    Beschreibung: The recent browning (increase in color) of surface waters across much of the northern hemisphere has important implications for light climate, ecosystem functioning, and drinking water treatability. Using log-linear regressions and long-term (6–21 years) data from 112 Swedish watercourses, we identified temporal and spatial patterns in browning-related parameters [iron, absorbance, and total organic carbon (TOC)]. Flow variability and lakes in the catchment were major influences on all parameters. Co-variation between seasonal, discharge-related, and trend effects on iron, TOC, and absorbance were dependent on pH, landscape position, catchment size, latitude, and dominant land cover. Large agriculture-dominated catchments had significantly larger trends in iron, TOC, and water color than small forest catchments. Our results suggest that while similarities exist, no single mechanism can explain the observed browning but show that multiple mechanisms related to land cover, climate, and acidification history are responsible for the ongoing browning of surface waters.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 16
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    The Swedish monitoring of surface waters: 50 years of adaptive monitoring (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-19
    Beschreibung: For more than 50 years, scientific insights from surface water monitoring have supported Swedish evidence-based environmental management. Efforts to understand and control eutrophication in the 1960s led to construction of wastewater treatment plants with phosphorus retention, while acid rain research in the 1970s contributed to international legislation curbing emissions. By the 1990s, long-time series were being used to infer climate effects on surface water chemistry and biology. Monitoring data play a key role in implementing the EU Water Framework Directive and other legislation and have been used to show beneficial effects of agricultural management on Baltic Sea eutrophication. The Swedish experience demonstrates that well-designed and financially supported surface water monitoring can be used to understand and manage a range of stressors and societal concerns. Using scientifically sound adaptive monitoring principles to balance continuity and change has ensured long-time series and the capability to address new questions over time.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 17
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    Unbekannt
    Satisfaction with fishing and the desire to leave (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-13
    Beschreibung: Predicting who may leave a fishery is an important consideration when designing capacity reduction programs to enhance both ecological and economic sustainability. In this paper, the relationship between satisfaction and the desire to exit a fishery is examined for the Queensland East Coast Trawl fishery. Income from fishing, and changes in income over the last 5 years, were key factors affecting overall satisfaction. Relative income per se was not a significant factor, counter to most satisfaction studies. Continuing a family tradition of fishing and, for one group, pride in being a fisher was found to be significant. Satisfaction with fishing overall and the challenge of fishing were found to be the primary drivers of the desire to stay or leave the fishery. Surprisingly, public perceptions of fishing, trust in management and perceptions of equity in resource allocation did not significantly affect overall satisfaction or the desire to exit the fishery.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 18
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    Vulnerability of coastal livelihoods to shrimp farming: Insights from Mozambique (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-13
    Beschreibung: Millions of people around the world depend on shrimp aquaculture for their livelihoods. Yet, the phenomenal growth of shrimp farming has often given rise to considerable environmental and social damage. This article examines the impacts of commercial, export-oriented shrimp aquaculture on local livelihood vulnerability by comparing the exposure, sensitivity, and adaptive capacity of shrimp farm employees with non-farm employees in rural Mozambique. Exposure to stressors was similar between the two groups. Shrimp farm employees had higher assets and higher adaptive capacity than non-farm employees. However, because their income is heavily dependent on a single commodity, shrimp farm employees were highly susceptible to the boom crop nature of intensive shrimp farming. The implications for aquaculture policy and vulnerability research are discussed. The article argues that coastal vulnerability is dynamic, variable, and influenced by multiple processes operating at multiple scales.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 19
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    Unbekannt
    Landscape–seascape dynamics in the isthmus between Sørkapp Land and the rest of Spitsbergen: Will a new big Arctic island form? (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-11
    Beschreibung: Transformation of the glaciated isthmus between Sørkapp Land and the rest of Spitsbergen since 1900 is described. The landscape–seascape dynamics depends on the glacial recession determined by climate warming after the Little Ice Age (i.e., since the beginning of the twentieth century, and especially since the 1980s). The isthmus has been narrowed from 28 km in 1899–1900 to 6.2 km in 2013, and lowered by 60–200 m from 1936 to 2005. Two isthmus’ glaciers will have melted, given the current thermic conditions, by 2030–2035. It cannot be ruled out that Sørkapp Land will become an island after that period, because the altitude of the glaciers’ bedrock is close to the sea level. The disappearance of this huge ice mass, even without origin of a sound and island, will lead to a great transformation of the landscape and the ecosystem.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 20
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    Poverty, development, and Himalayan ecosystems (2014)
    Springer
    Details
    Publikationsdatum: 2014-11-05
    Beschreibung: The Himalayas are rich in biodiversity but vulnerable to anthropogenic pressures. They are also host to growing number of rural poor who are dependent on forest and ecosystem services for their livelihood. Local and global efforts to integrate poverty alleviation and biodiversity conservation in the Himalayas remain elusive so far. In this work, we highlight two key impediments in achieving sustainable development in the Himalayas. On the positive side, we also highlight the work of Ashoka Trust for Research in Ecology and the Environment (ATREE), a research organization based in India that seeks to integrate biodiversity concerns with livelihood security. For impediments, we draw on two examples from the Darjeeling district, India, in Eastern Himalayan region to illustrate how development organizations are failing to simultaneously address poverty and environmental issues. Based on the success of ATREE, we then propose a conceptual framework to integrate livelihood generating activities with sustainable and equitable development agenda. We recommend developing a Hindu-Kush Himalayan Ecosystem Services Network in the region to formulate a strategy for further action. We conclude by offering measures to address the challenge of integrating livelihood and environment issues through this network.
    Print ISSN: 0044-7447
    Digitale ISSN: 1654-7209
    Thema: Energietechnik
    Publiziert von Springer im Namen von The Royal Swedish Academy of Sciences.
    Standort Signatur Einschränkungen Verfügbarkeit
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