Projects/Activities

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Displaying: 21 - 40 of 58 Next
21. Controlled dose-control experiment on POP in sledge dogs

Organochlorines (OCs) concentrate through the arctic marine food webs and are stored in the adipose tissue due to their high lipophilic and persistent characteristics. The polar bears receive high doses of POPS through their diet and a controlled experimt was need to resolve effect on the immune system and effects on internal organs. Such a controlled experiment on sledge dogs as a replacement test organism for the polar bear was conducted from 2004-2006 to investigate dose-response effects.

Biological effects Organochlorines PCBs Polar bear Exposure Persistent organic pollutants (POPs) Reproduction Pesticides Diet Marine mammals
22. Marine corrosion of stainless steel in Polar seawater

The effects of biofilm settlement on corrosion resistance of stainless steels in polar seawaters are not well known. In warmer conditions (Mediterranean sea) biofilm increases both the risk of localised corrosion onset and the propagation rate of corrosion attack. Corrosion tests carried out in Antarctica demonstrated that biofilm growth at about 0°C induced electrochemical effects less important than those occurring in warmer conditions. On the contrary, corrosion tests performed in similar environmental conditions at Ny-Aalesund (Svalbard) showed more severe corrosion attack than in Antarctica. This research aims: - to define the influence of biofilm on stainless steel corrosion resistance in polar seawater in the range of temperature between -1 and +5 °C, - to define if change in salinity can influence corrosion process, - to identify stainless steel grades which can be acceptable in such conditions (polar seawater seems to be somewhat less corrosive, which gives the possibility to use cheaper stainless steels).

marine corrosion Biological effects stainless steels seawater Oceanography Exposure
23. Marine food webs as vector of human patogens

Marine foodwebs as vector and possibly source of viruses and bacteria patogenic to humans shall be investigated in a compartive north-south study. Effects of sewage from ships traffic and urban settlements, on animals of arctic foodwebs will be studied.

Pathways Biological effects Hydrography Fish Discharges Pollution sources Environmental management Contaminant transport Terrestrial mammals Shipping Polar bear Exposure Arctic Local pollution Seabirds Shellfish Food webs Waste Human health Human intake Marine mammals
24. Long-term effects of offshore discharges on cold water zooplankton: establishing a test system for chronic exposure to offshore discharges

During the last decade the concern regarding environmental effects of the offshore industry has shifted from effects of drilling discharges on benthic communities, towards a stronger focus on the water column and effects on the pelagic ecosystem. At the same time, oil and gas development is expanding in the Norwegian and Russian sectors of the Barents Sea. In this regard, a project has been initiated to look at responses of especially Calanus spp. and other copepod species to long-term, sublethal exposure to selected offshore discharges and discharge components, as well as accidental oil spills. Calanus spp. is ecologically the most important zooplankton species along the Norwegian shelf and in the Barents Sea. A laboratory based facility for culture through several generations is being developed through this project. In addition, the impact of oil compounds on the cold-water and arctic Calanus species-complex will be examined by carrying out a series of laboratory (some at Ny Ålesund) and ship based experiments. The response parameters will include both behavioral (feeding, mate finding, avoidance) and physiological (mortality, egg production, development rates, oxygen consumption and assimilation efficiency) parameters. The ultimate outcome of this research is expected to be a supporting instrument for ecological risk assessment of offshore discharges, which is highly relevant both to the North Sea, the mid-Norway shelf and the Barents Sea.

Pathways Biological effects Biology PAHs Pollution sources Environmental management Contaminant transport Petroleum hydrocarbons Exposure Arctic Oil and Gas
25. The Effect of solar UV on lipids in the planktonic food chain of polar freshwater ponds

Plankton of shallow polar freshwater water bodies is exposed to increasing levels of ultraviolet radiation (UVR) due to the limited water depth. Daphnia (Crustacea, waterflea) and algae are common representatives of the food chain in these water bodies. Daphnia almost exclusively use lipids for energy storage, which they obtain from their food (mainly algae). Therefore, Daphnia and algae are closely linked to each other. Preliminary experiments on the UV-induced damage in phyto- and zooplankton point to lipids as one of the key players. With this application we want to identify how algae specific lipids and fatty acids (FA) are modified by UVR. The factors modifying UV-doses to the animals and their food are depth of the waterbody and DOC (absorbs UV). A pondsurvey shall provide a wide spectrum on ponds which vary in DOC and depth. Lipid analysis of Daphnia and their food of these ponds as well as physical parameters of the pond waters shall identify correlations between UV-exposure and specific fatty acids. This shall enable us to estimate the effect of solar UVR on the freshwater plankton community in polar ponds.

Biological effects UV radiation freshwater plankton Climate change Exposure Arctic Food webs Diet Ecosystems lipids
26. Determination of cloud coverage and radiative forcing from surface measurements

Specific objectives of the proposal are: 1. the determination of the cloud coverage by means of a simple methodology based on radiometric measurements; 2. the determination of the radiative forcing produced by different type of cloud and coverage for applications into GCM’s as ‘cloud parameterisations’. The results will be obtained for two different radiative regimes by means of different experimental campaigns.

effects on surfaces energy fluxes measurement of the radiative surface partition Radioactivity cloud coverage Exposure solar radiation radiative forcing Atmosphere
27. Bioaccumulation, physiological and biochemical effects of pollutants in mussels

In order to evaluate the capacity of mussels to accumulate pollutants and to enhance growth and physiological effects, an investigation was carried out in the Faroe Islands and in the Skagerrak. In March 2000, about 1500 mussels of proper dimensions (length ranging between 5 and 6 cm) were collected in the Kaldbak Fjord (Faroe Islands) on a 10m water column. Selected mussels were divided in 4 groups (320 each) and deployed in 4 different stations (one at the Faroe Islands and three in the Skagerrak). Semipermeable membrane devices (SPMDs) were also deployed in the same stations for the preconcentration of lipophilic pollutants. One month later (end of April-beginning of May) mussels and SPMDs were recollected and sent to different laboratories for the determination of various parameters.

Mytilus Biological effects Biology scope for growth Organochlorines PCBs Heavy metals PCB bioindicator PAHs Long-range transport Contaminant transport Exposure PAH Persistent organic pollutants (POPs) Dioxins/furans SPMD bioconcentration
28. Interactions among infauna, microorganisms and polycyclic aromatic hydrocarbons in marine sediments

Dose-response experiments using 5 different sediment concentrations of fluoranthene (Flu) and pyrene (Py) respectively. Measuring radioactive marked Flu and Py in brittlestars and polychaetes and microbial degradation of Flu and Py in sediment. Also growth rate of brittlestars and polychaetes and determination of regenerationtime of brittlestar-arms.

Biological effects Biology PAHs microorganisms Petroleum hydrocarbons infauna Exposure Sediments
29. Ther use of SPMD's and DGT's for the detection of trace-level pollutanys in water

To be completed.

Organochlorines PCBs Heavy metals PAHs Long-range transport Contaminant transport Petroleum hydrocarbons Exposure Dioxins/furans
30. Effects of UV-B radiation on Microbial communities in Kongsfjorden

Effects of UV-B radiation on microbial communities in Kongsfjorden in relation to metal and dissolved organic matter availabillity.

Biological effects Ozone Biology UV radiation Heavy metals Environmental management Exposure Arctic Model ecosystem Ecosystems
31. Recruitment on hard bottom

Observation how UV-radiation affects recruitment on hard substrate in the upper sublitoral zone.

Shelf seas Biological effects Biology marine algae UV radiation Climate change Exposure Biodiversity Reproduction Temporal trends Ecosystems seaweeds
32. Correlation between algal presence in water and toxin presence in shellfish

1. Analysis of existing data from the current shellfish monitoring programmes in order to design a suitable sampling strategy 2. Ideentification of toxic algal species in UK waters 3. Construction of a detailed time-series at several key sites in the UK for toxic phytoplankton and shellfish toxin occurence 4. Comparison of the genotype versus toxicity of suspected toxic species between sites

Pathways Biological effects Algal Biology Fish Contaminant transport Exposure Food webs Ecosystems Human intake
33. A new generation of biocides for control of fish lice in fish farms and biofilms on submerged materials

1. To develop a system of photoactive biocides for treating sea lice and biofouling (Further details in confidence)

Biological effects Mapping Fish Discharges Environmental management Contaminant transport Modelling Exposure Photosensitisation Local pollution Pesticides Photodynamic Marine mammals
34. Effects of UV-radiation on macroalgae of the Kongsfjorden

Photoinhibition of photosynthesis by UV radiation, the formation of UV-screening pigments, DNA damage by UV radiation as well as DNA repair mechanisms will be determined in marine macroalgae of the Kongsfjord. Moreover, algae from different water depths will be transplanted by divers into areas with opposite light climate or covered by UV-screening filters and their physiological reactions tested. Additionally, the susceptability of the unicellular algal spores to UV-radiation will be tested. The results will allow insights into the effect of UV and photosynthetically active radiation on the zonation of macrocalgae and on the structure of phytobenthic communities. The data will be used to model the effects of increased of UV-radiation due to stratospheric ozone depletion on the Kongsfjord phytobenthic communities.

Biological effects Ozone Biology DNA UV radiation Phytobenthic communities Marine macroalgae Exposure Arctic Algae
35. Effects of UV radiation on growth and recruitment of macroalgae: implications for vertical zonation of macroalgae across a latitudinal gradient

This study will be designed to determine the response mechanisms of representative species of macrophytes along the tide flat to provide the physiological basis for answers for ecological questions, in particular how the community structure of various beds of macroalgae from the intertidal to the subtidal (eulittoral to sublittoral) region of the coastal ecosystem is affected by enhanced UV radiation. In situ measurement of photosynthetic efficiency, growth, community structure and succession will be conducted to investigate how do different species of macrophytes respond to changes in the light environment over a depth gradient and across seasons of the year. It is hypothesized that the differences in the ability to tolerate stress are the main factors controlling the distribution pattern of macrophytes. With the limited understanding in the control of tolerance, elucidating the mechanism of stress in the physiology and ecology of the organisms will allow us to quantify the impediments encountered by organisms inhabiting the tide flats. Objectives: 1. To measure the daily and seasonal variation in photosynthetically active and ultraviolet radiation. 2. To characterize the macrophyte community structure of the coastal habitat. 3. To perform UV exclusion and UV supplementation experiments in order to assess its effect on the growth of some macrophyte species in the field and in mesocosms. 4. To assess the prevention of UV damage in selected macroalgae by production of sunscreen pigments. 4. To determine the recruitment rate, recolonization pattern and succession under PAR and varying UVR condition.

Biological effects Marine Algae UV radiation Seaweeds Climate change Exposure Biodiversity Ecosystems
36. Toxicological effects of bioaccumulated pollutants

Persistent organic pollution is a global problem. This fact is especially apparent in the Arctic where pesticides currently used in distant environments accumulate, in some cases to higher levels than those observed in the source region. This pollution threatens the well-being of the aboriginal inhabitants of these regions. Most of the traditionally harvested animals in the Arctic are long-lived and from the higher trophic levels of the food chain, thereby providing an opportunity for considerable bioaccumulation and biomagnification of persistent contaminants. This has prompted a growing concern by the Alaska Inupiat that pollutants in the environment might be contributing to their unique morbidity and mortality rates, especially of their children. Our studies are currently focused on two specific organic pollutants found in the Arctic environment; 1}hexachlorobenzene (HCB), a byproduct during manufacture of several different chlorinated compounds and consistently detected in the Arctic and, 2} dichlorodiphenyl dichloroethylene (p,p’-DDE), a chlorinated environmental breakdown product measured in the Arctic population at significantly higher concentrations than the parent pesticide, DDT. We hypothesize that mammalian embryonic cell exposure to these chemicals, individually or as mixtures at environmentally relevant concentrations and ratios, will alter the cell cycle and/or cause death by apoptosis, rather than by necrosis. We also predict synergistic cytotoxicity of the chemical mixture because of an accumulation of deleterious effects at different cellular target sites by each chemical. We further hypothesize that while some chemicals target non-genetic cellular components (such as a cell membrane or cytosolic component), other chemical effects will occur primarily at the genetic level, directly or indirectly. Our experiments have been designed as a set of sensitive cellular and molecular assays to compare levels and types of cytotoxic and genotoxic activity of the above chemicals (individual and mixture), at environmentally relevant concentrations, upon embryonic cells in culture. Our experimental evidence thus far is that these chemicals, separately or as a mixture at concentrations and molar ratios relevant to that measured in the Arctic environment, do have cytotoxic and/or genotoxic effects that could result in profound consequences to exposed tissues of a developing embryo or fetus. We have further experimental evidence that exposure to both chemicals at environmentally relevant concentrations is more toxic to the cell than the sum of effects by exposure to the individual chemicals. Experimental results indicate this is due to different cellular target sites for each chemical (Appendix A: Preliminary Results).

Biological effects Indigenous people Exposure Arctic Persistent organic pollutants (POPs) Human health
37. UV/marine macrophytes

The overall objective is to assess the influence of increased UV radiation and temperature on photosynthesis, nutrient uptake and primary production of microphytes. In order to do this, the existence and nature of strategies against potential UV damage in marine macrophytes of different climatic regions will be investigated. Research activities Measurement of photosynthesis using oxygen exchange and variable fluorescence (PAM); determination of oxidative stress (Gluthation, SOD, CLSM) and nutrient uptake under different UV-regimes

Biological effects nutrient uptake UV radiation photosynthesis Exposure production
38. UV-radiation and its impact on genetic diversity, population structure and foodwebs of arctic freshwater

The aim of this international project is to measure and model arctic UV-radiation and assess the effects on freshwater planktonic organisms and foodwebs. The fieldwork and experiments are conducted at Ny-Alesund, Spitsbergen. The specific aim of our participation is to study the food web effects of UV-B stress by means of in-situ enclosure studies. In the laboratory we found that UV-B stressed algal cells may increase in volume and form a thicker cell wall. These changes in the algal cells may reduce their digestibility by zooplankton. Further the role of photopigments (like melanin and carotenoids), present in some zooplankters, will be studied in relation to the survival of these animals at high UV-B exposure. Research activities Grazing experiments with Daphnia pulex (melanic and hyaline) are performed in in-situ enclosures (under different UV exposures) in the Brandal Lagune during July. The green alga Chlamydomonas will be incubated in-situ under different UV exposures to assess the potential use of this alga as a biodosimeter for UV-B. Further the survival of melanic and hyaline daphnids will be tested in-situ.

Biological effects UV radiation survival photopigments Exposure Food webs Reproduction phytoplankton zooplankton
39. Health effects of increased UV exposure

Besides some beneficial effects of UV exposure, i.e. skin tanning and vitamin D production, UV ex-posure can have deleterious effects on human health. Deleterious effects are a.o. skin cancer, skin aging, wrinkling, cataract, snow blindness, and effects on the immune system. The objectives of this project are especially aimed at the detection of UV effects on the human immune system and as a consequence of the UV induced immunomodulation effects on the resistance to infections and tumors. Research activities Research activities are focussed at laboratory animal studies, studies with human volunteers, epidemiology and mathematical modelling.

Biological effects epidemiology UV radiation immunology Exposure Human health
40. Radiation monitoring in the Russian Arctic

During 2000, observations under the framework of control of radioactive contamination were continued at 34 sites of the State System of Radiation Monitoring in the Russian Arctic. At all stations, daily monitoring of exposure dose strength of gamma emissions, and daily sampling of radioactive fallout from the atmosphere to determine total beta-activity are conducted. At sites in Arkhangelsk, Naryan-Mar, Salekhard, Murmansk, Dikson Island, Zhelaniya Cape, Kheis Island and Kandalaksha, sampling of atmospheric aerosols and precipitation was performed for specific radioisotopic analysis, including determination of tritium. Samples of surface water for determination of levels of 90-Sr and tritium were collected at radioactive contamination control stations in the mouth regions of the largest rivers of the Russian Arctic (Severnaya Dvina, Pechora, Mezen, Ob, Yenisey, Khatanga, Indigirka). 26 samples were collected for this purposes in 2000. Samples for determination of 90-Sr in seawater were collected at relevant sites in the Barents Sea and White Sea.

Sources Radioactivity Discharges Pollution sources Radionuclides Emissions Exposure