Potsdam, Germany
Potsdam, Germany
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Holzhauer S.I.J.,Leibniz Institute of Freshwater Ecology and Inland Fisheries | Holzhauer S.I.J.,Senckenberg Institute | Franke S.,Leibniz Institute for Plasma Science and Technology | Kyba C.C.M.,Leibniz Institute of Freshwater Ecology and Inland Fisheries | And 17 more authors.
Sustainability (Switzerland) | Year: 2015

Artificial light at night (ALAN) is one of the most obvious hallmarks of human presence in an ecosystem. The rapidly increasing use of artificial light has fundamentally transformed nightscapes throughout most of the globe, although little is known about how ALAN impacts the biodiversity and food webs of illuminated ecosystems. We developed a large-scale experimental infrastructure to study the effects of ALAN on a light-naïve, natural riparian (i.e., terrestrial-aquatic) ecosystem. Twelve street lights (20 m apart) arranged in three rows parallel to an agricultural drainage ditch were installed on each of two sites located in a grassland ecosystem in northern Germany. A range of biotic, abiotic, and photometric data are collected regularly to study the short- and long-term effects of ALAN on behavior, species interactions, physiology, and species composition of communities. Here we describe the infrastructure setup and data collection methods, and characterize the study area including photometric measurements. None of the measured parameters differed significantly between sites in the period before illumination. Results of one short-term experiment, carried out with one site illuminated and the other acting as a control, demonstrate the attraction of ALAN by the immense and immediate increase of insect catches at the lit street lights. The experimental setup provides a unique platform for carrying out interdisciplinary research on sustainable lighting. © 2015 by the authors.

News Article | December 21, 2016

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Dec. 21, 2016) - TerraX Minerals Inc. (TSX VENTURE:TXR)(FRANKFURT:TX0)(OTC PINK:TRXXF) is pleased to announce results from surface mapping and prospecting on the Southbelt Property of the Yellowknife City Gold Project. The Southbelt property immediately adjoins the mine leases for the past producing Con Mine, where over 6.0M oz of gold were mined at an average grade of 16.1 g/t Au over a 60 year mine life, and covers the extensions of several mineralized trends previously mined at the Con, including the namesake "Con Shear", which appears to continue on to our property for up to 5 km. Other structures have been identified on surface that strike south from the Con property for distances of greater than 1 km onto our claims and contain values up to 94.9 g/t Au (news release September 23, 2015), with values in the 2016 exploration work up to 33.6 g/t Au and 16.4 g/t Au in grab samples. A map of the sampling at Southbelt is available on our web site under "2016 Field Exploration" under the "Southbelt" project section. Joe Campbell, Chairman and CEO of TerraX states, "The extension of shear and vein systems with known historical production on to our Southbelt property make for very exciting targets for discovery of significant gold deposits. The Southbelt contains multiple high grade, high priority targets with very high potential for discovery." A total of approximately 530 samples were taken from outcrop across wide areas of the property which covers 8 kilometers of strike length along the "Yellowknife Gold belt" adjacent to and south of the formerly producing Con Mine. Of the 530 samples, 88 returned values greater than 0.50 g/t Au, of which 10 samples were between 3.00 and 15.00 g/t Au, with high values of 33.6 g/t Au and 16.4 g/t Au, as indicated on the map referenced above. The 2016 exploration results and compilation of historical exploration together defined the extensions of the mineralized structures mined at Con onto the TerraX ground, with multiple additional parallel and cross-cutting gold bearing structures discovered by TerraX. After just one field season on Southbelt, TerraX was able to identify multiple drill targets at Southbelt that warrant immediate drilling. TerraX submitted an application to the Mackenzie Valley Land and Water Board for a Land Use Permit ("LUP") for drilling on Southbelt which was accepted as complete on December 2nd, initiating the 42 day permit approval process. Approval of this LUP application will allow TerraX to begin drilling on Southbelt during the first quarter of 2017 on the extensions of the mineralized structures striking south from the Con. The application is for a five year LUP across the entire Southbelt property, giving TerraX maximum exploration flexibility for making a discovery. Subsequent to the mapping and sampling programs, TerraX received the results of a LIDAR survey flown over the Southbelt property during the summer of 2016. LiDAR flown in 2014 has proven valuable in defining and extending mineralized trends on the Northbelt properties, and it is expected to greatly enhance TerraX's exploration efforts on Southbelt moving forward. For more information on the Southbelt property, visit the "Southbelt" property section at Sampling included insertion of certified standards and blanks into the stream of samples for chemical analysis. Samples were prepared at ALS Chemex's laboratory in Yellowknife and shipped to their Vancouver facility for gold analysis by fire assay and other elements by ICP analysis. ALS is a certified and accredited laboratory service. It should be noted that, due to their selective nature, assay results from grab samples may not be indicative of the overall grade and extent of mineralization on the subject area. The technical information contained in this news release has been approved by Joseph Campbell, the CEO of TerraX, who is a Qualified Person as defined in "National Instrument 43-101, Standards of Disclosure for Mineral Projects." Yellowknife City Gold ("YCG") encompasses 129 sq km of contiguous land immediately north and south of the City of Yellowknife in the Northwest Territories. Through a series of acquisitions, TerraX now controls one of the six major high-grade gold camps in Canada. Being within 15 km of the City of Yellowknife, the YCG is close to vital infrastructure, including transportation, service providers, hydro-electric power and skilled tradespeople. The YCG lies on the prolific Yellowknife greenstone belt, covering 23 km of strike length on the southern and northern extensions of the shear system that hosted the high-grade Con and Giant gold mines. The project area contains multiple shears that are the recognized hosts for gold deposits in the Yellowknife gold district, with innumerable gold showings and recent high grade drill results that serve to indicate the project's potential as a world-class gold district. For more information on the YCG project, please visit our web site at On behalf of the Board of Directors, Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. This news release contains forward-looking information, which involves known and unknown risks, uncertainties and other factors that may cause actual events to differ materially from current expectation. Important factors - including the availability of funds, the results of financing efforts, the completion of due diligence and the results of exploration activities - that could cause actual results to differ materially from the Company's expectations are disclosed in the Company's documents filed from time to time on SEDAR (see Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release. The company disclaims any intention or obligation, except to the extent required by law, to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Tegetmeyer C.,University of Greifswald | Frick A.,LUP GmbH | Seifert N.,University of Greifswald
Ostrich | Year: 2014

The only well-studied wintering ground of the globally threatened Aquatic Warbler Acrocephalus paludicola is the 'Djoudj area' in Senegal. This study identifies potential Aquatic Warbler habitats within that area and gives an estimate of the size of the local wintering population. A land-cover map was generated by classifying high-resolution satellite images. Overlaying it with presence-absence data from field surveys and using logistic regression models (GLMM), we derived the presence probability of the Aquatic Warbler in the study area. Using presence probability as a proxy of habitat suitability we identified 4 729 ha of potential habitat. We calculated the population density of the Aquatic Warbler by applying a Poisson mixed model to our land-cover raster data and estimate a total population size of 776 individuals (range 260-4 057), i.e. 0.37-19.8% of the world population. However, this estimate is complicated by uncertainties including the unknown efficiency of the bird-catching method, clumped presence of individuals, the variability of water levels and other seasonal changes. An effective management of Aquatic Warbler habitats in the Djoudj area should include extensive grazing, the control of litter accumulation and shrub growth, and the removal of plant material from the channels to improve water circulation. © 2014 © NISC (Pty) Ltd.

Steffenhagen P.,University of Greifswald | Zerbe S.,Free University of Bozen Bolzano | Frick A.,LUP GmbH | Schulz K.,University of Greifswald | Timmermann T.,University of Greifswald
Naturschutz und Landschaftsplanung | Year: 2010

In the German federal state of Mecklenburg-Western Pomerania lowland fens having been rewetted within the 'Mire Conservation Program' were investigated in order to qualitatively and quantitatively assess ecosystem services. A particular focus was laid on vegetation development after rewetting, aboveground biomass production, and nutrient standing stock by helophytes and water plants and an assessment of peat forming potential on the landscape level. In particular, reed (Phragmites australis) plays a major role regarding biomass production and nutrient storage. In conclusion, after 10 years of rewetting the 'Mire Conservation Program' in Mecklenburg-Western Pomerania has to be considered a success with regard to the restoration of ecosystem services: (1) A diverse mosaic of different vegetation types has developed providing a valuable habitat for wetland species, (2) considerable amounts of nutrients (C, N, P) are retained which positively contribute to the landscape nutrient balance in an eutrophicated landscape by natural peat accumulation or artificial removal through mowing, and (3) a considerable potential of peat accumulation as one of the main objectives of sustainable mire conservation.

Frick A.,LUP GmbH | Steffenhagen P.,Free University of Bozen Bolzano | Zerbe S.,University of Greifswald | Timmermann T.,Free University of Bozen Bolzano | Schulz K.,Free University of Bozen Bolzano
Photogrammetrie, Fernerkundung, Geoinformation | Year: 2011

Peatland was subject to heavy drainage and degradation throughout the world and thus is now the focus of large scale restoration attempts. The monitoring of both vegetation development and balance of matter after restoration has started is indispensable, since an important objective of peat-lands rewetting is the rehabilitation of their sink function. Against this background, we investigated rewetted fens in NE Germany in order to qualitatively and quantitatively evaluate the vegetation development after restoration measures. The aim of this study was to analyse the vegetation composition with multispectral and very high spatial resolution satellite imagery. We investigated two sites with different rewetting dates and also took biomass and carbon content samples for the main plant species in order to estimate nutrient storage. We tested the applicability of various satellite sensors (QuickBird, WorldView I and SPOT) and an iterative classifcation scheme based on decision trees for mapping several wetland plant species (e. g. Phragmites australis, Typha spp. and Carex spp.) and vegetation types. We chose three different widely used decision tree classifers for this study: AdaBoost, See5 and RandomForest. Evaluation criteria were overall accuracy and mean class accuracy. Multispectral and very high spatial resolution satellite data and the developed method allow for the identifcation of the most important vegetation types in rewetted fens. All applied sensors yielded good results with overall accuracies of 85% and 92%. Some classes reached lower accuracies due to different reasons (capture date, size of training set or spatial resolution of the sensor). We found remote sensing a very valuable tool not only for the observation of the restoration success in rewetted peatland but also for the analysis of the peat accumulation potential as well as biomass and nutrient storage. © 2011 E. Schweizerbart'sche Verlagsbuchhandlung.

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