Andre Steinhäuser

Questions and Answers (22) View all

• Answer added in Geographic Information System (GIS)
  13 Is there any way in ArcGIS to calculate the Latitude and Longitude of each pixel?
  By Rakhshan Roohi · La Trobe University
  Andre Steinhäuser · Landesamt für Umwelt, Naturschutz und Geologie

  Good morning. You could convert the raster to polygons without dissolving and then calculate the center of each raster cell polygon. regards, André 

  Good morning. You could convert the raster to polygons without dissolving and then calculate the center of each raster cell polygon. regards, André
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• Answer added in Biomonitoring
  9 What are the possible ways to promote benthic organisms' diversity in a stream system?
  By Dr.K.Mophin Kani · Manonmaniam Sundaranar University
  Andre Steinhäuser · Landesamt für Umwelt, Naturschutz und Geologie

  The main factor for diversity of benthic organisms is habitat diversity. You could increase: 1. morphologic diversity, e.g. punctual channel narrowin... [more]

  The main factor for diversity of benthic organisms is habitat diversity. You could increase: 1. morphologic diversity, e.g. punctual channel narrowing, leads to substrate diversity and general structural upgrading 2. substrate diversity , mainly by adding coarser substrates (gravel) 3. the number of different habitats, e.g. by adding dead wood as habitat 4. the plant cover of the river-banks (trees and bushes), first to create shadow and reduce the growth of macrophytes and second to give habitats to the adult phases of semiaquatic macroinverebrates such as Trichoptera, Plecotpera or Odonata. Meanwhile you should have a look at physical/chemical water qualiity. To get more specialised organisms, reduce nutrients-input from punctual sources (sewage plants etc.) and diffuse sources as well. regards, André
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• Answer added in Mollusca
  1 I am looking for a guide to aid in the identification of freshwater limpet species.
  By Kaylynne Marquez · University of Oregon
  Andre Steinhäuser · Landesamt für Umwelt, Naturschutz und Geologie

  For Germany there is a handbook for freshwater-auditing which also lists literature for identification. It can be found at the link below. Perhaps you... [more]

  For Germany there is a handbook for freshwater-auditing which also lists literature for identification. It can be found at the link below. Perhaps you could ask at the Oregon Department of Environmental Quality (http://www.deq.state.or.us/lab/wqm/watershed.htm) for more regional literature. Regards, André

  http://www.fliessgewaesserbewertung.de/downloads/abschlussbericht_20060331_anhang_IX.pdf ×
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• Answer added in Freshwater Biology
  4 What are the biological indicators in river / stream ecosystem?
  By Dr.K.Mophin Kani · Manonmaniam Sundaranar University
  Andre Steinhäuser · Landesamt für Umwelt, Naturschutz und Geologie

  Even a brief answer to your question would need a smaller book. I can give you a short overview about what we do in germany/europe according to the Eu... [more]

  Even a brief answer to your question would need a smaller book. I can give you a short overview about what we do in germany/europe according to the European waterframework directive (WFD). The WFD defines four biologic quality elements for monitoring different impacts. 1. macroinvertebrates: monitoring structural degradation, saprobic pollution(point sources), diffuse sources/land use impacts 2. macrophytes and phytobenthos: monitoring trophic pollution and diffuse sources/land use impacts (via diatoms) 3. phytoplankton: monitoring trophic pollution, mainly in bigger rivers with autochthonous river plankton 4. fishes: monitoring structural degradation and ecological passability of river systmes further information can be found at the following link, a good overview gives page 37. https://circabc.europa.eu/sd/d/63f7715f-0f45-4955-b7cb-58ca305e42a8/Guidance%20No%207%20-%20Monitoring%20%28WG%202.7%29.pdf regards, André
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