Essays about: "diatoms"

Showing result 11 - 15 of 22 essays containing the word diatoms.

  1. 11. Diatom distribution in the lower Save river, Mozambique : Taxonomy, salinity gradient and taphonomy

    University essay from Stockholms universitet/Institutionen för naturgeografi

    Author : Marie Christiansson; [2016]
    Keywords : Diatoms; Quaternary geology; micropaleontology; taphonomy; taxonomy; siliceous microfossils;

    Abstract : In this study diatom distribution within the lower Save River, Mozambique, has been identified from surface sediments, surface water, mangrove cortex and buried sediments. Sandy units, bracketing a geographically extensive clay layer, have been dated with optical stimulated luminescence (OSL). READ MORE

  3. 12. 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

  4. 13. Zinc tolerance of freshwater diatoms isolated from sites with zinc pollution; and pH effect on zinc toxicity

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

    Author : Amanda Hedenborg; [2016]
    Keywords : freshwater diatoms; indicator for metal pollution; zinc pollution; pH; malformations;

    Abstract : The aim with this study was to observe the zinc (Zn), tolerance for different strains isolated from sites with Zn pollution and to observe if lower pH decreases the Zn toxicity. Another aim was to see if malformations could be an indicator for Zn pollution. Zn is found naturally in the bedrock, sediment and waterbodies. READ MORE

  5. 14. 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. 15. The Swedish liming operation : a study about liming officers opinions about some aspects regarding ecology, economy and organization

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

    Author : Rebecka Karlsson; [2013]
    Keywords : acidification; county administrative boards; liming;

    Abstract : This is a study about the Swedish liming operation and the Swedish liming officer’s opinions of some aspects regarding ecology, economy and organization. The study objectives was motivated due to the recent changes in manuals for the assessment of limed waters and the suggested changes in decision making and decreased budget for liming. READ MORE