Essays about: "benthic diatom"

Showing result 1 - 5 of 8 essays containing the words benthic diatom.

  1. 1. Diatoms from the late Holocene of the western Chukchi Sea, Arctic Ocean: environmental signals and palaeoceanography

    University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

    Author : Erik Browaldh; [2022]
    Keywords : diatoms; late holocene; SWERUS-L2-2-PC1; Herald Canyon; Chukchi Sea; ice-algae; sympagic; cryophilic; warm water diatom; Bering Sea Water species; bottom water temperature; BWT; benthic foraminifera; palaeothermometry; ice dynamics; Fragilariopsis; Fossula arctica; Paralia sulcata; Shionodiscus oestrupii; Thalassiosira simonsenii; Chaetoceros; Chaetoceros sp. 7;

    Abstract : The sediment Core SWERUS-L2-2-PC1 (2PC) retrieved from the Chukchi Sea, Arctic Ocean sits in an oceanographically dynamic location at the Arctic-Pacific Ocean gateway. The 8.3 m-long core was retrieved in Herald Canyon at the marginal ice zone at 57 m depth. READ MORE

  3. 2. Malformation in different species of benthic diatoms in three herbicide polluted streams in southern Sweden

    University essay from Högskolan i Halmstad/Akademin för ekonomi, teknik och naturvetenskap

    Author : Helena Spångfors; [2017]
    Keywords : diatoms; primary producers; unicellular algae; diatom index; malformation; deformation; herbicides; pesticides; kiselalger; primärproducenter; encelliga alger; kiselalgsindex; missbildning; missbildade; växtskyddsmedel; bekämpningsmedel; primärproducenter; encelliga alger; Höje å; M42; Skivarpsån;

    Abstract : Målet med den här studien var att undersöka kiselalger och dess eventuella missbildningar i tre vattendrag i södra Sverige - Höje å, Skivarpsån och M42. Kiselalger används som bioindikator för vattenkvalitet i hela Europa, men de befintliga kiselalgsindexen visar inte eventuell förekomst av miljöfarliga ämnen. READ MORE

  4. 3. The impact of phosphorus and temperature on the toxicity of zinc on benthic diatom

    University essay from SLU/Dept. of Aquatic Sciences and Assessment

    Author : Josabeth Ström; [2016]
    Keywords : benthic diatom; zinc; temperature; phosphorus; toxicity; ecological status;

    Abstract : The current index, IPS, developed for benthic diatoms and used for assigning the ecological status of streams in Sweden reflects on levels of nutrients and organic pollution. Metals are not considered in the index, which leads to the risk that metal contaminated streams can be assigned a high ecological status based on this index. READ MORE

  5. 4. Freshwater pearl mussel as indicators of Swedish streams - a comparison between freshwater pearl mussel and biological quality elements

    University essay from SLU/Dept. of Aquatic Sciences and Assessment

    Author : Kristin Forsell; [2014]
    Keywords : flodpärlmussla; biologiska kvalitetsfaktorer; freshwater pearl mussel; biological quality elements;

    Abstract : The freshwater pearl mussel (Margaritifera margaritifera) is a large freshwater mussel. Because of its sensitivity to human impact, such as eutrophication, acidification and alterations of hydromorphology, the species is considered as a robust indicator of stream water quality and biodiversity. READ MORE

  6. 5. Environmental impacts of early metallurgy in Moshyttan : A study of one of Europe's oldest blast furnaces, using three lakes records in Nora bergslag

    University essay from Institutionen för ekologi, miljö och geovetenskap

    Author : Erik Myrstener; [2013]
    Keywords : Diatoms; Biogenic silica; Geochemistry; Pre-industrial metallurgy; Environmental effects;

    Abstract : The aim of this study was to assess the environmental effects of Moshyttan, one of the earliest known blast furnaces in Europe (ca. 11th century). The study was based on the analysis of three lake records in the immediate surroundings of the smelter. Fickeln lies directly downstream and is the main recipient of waterborne pollution. READ MORE