Essays about: "nitrogen stable isotope"

Showing result 1 - 5 of 9 essays containing the words nitrogen stable isotope.

  1. 1. Aquaculture and its effect on the wild fish resource in a Swedish lake : An evaluation of changes in fat content, protein content and trophic niche

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Emmy Nyberg; [2022]
    Keywords : Aquaculture; wild fish; fat content; protein content; stable isotopes;

    Abstract : Fish is nutritious and important as a food source for many people. It contains high levels of protein, important omega-3 fatty acids as well as micronutrients. For a sustainable fish consumption, aquaculture is needed but it can affect nearby ecosystems in many ways. READ MORE

  3. 2. Spatial and temporal variations in stable isotope signatures (δ13C and δ15N) of the gammarids and the common carp in the southern coast of the Caspian Sea

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Nazila Hajizadeh Koupayeh; [2020]
    Keywords : carbon stable isotope; Caspian sea; Cyprinus carpio; food webs; Gammarus aequicauda; nitrogen stable isotope; Pontogammarus maeoticus;

    Abstract : Despite the growing body of research on the use of stable isotope analysis in food web studies, spatial and temporal variations in stable isotope ratios of coastal communities are still poorly understood. The aim of my study is to explore how carbon and nitrogen stable isotopes of selected benthic communities vary spatially and temporally across the south of Caspian Sea. READ MORE

  4. 3. Changing Agriculture : Stable isotope analysis of charred cereals from Iron Age Öland

    University essay from Stockholms universitet/Arkeologiska forskningslaboratoriet

    Author : Markus Eklund; [2019]
    Keywords : barley; wheat; oat; rye; carbon; nitrogen; isotope; FTIR; manuring; ecology; systems; networks; climate; resilience; entanglement; migration period; Sandby; Gråborg; Skedstad; Prästhag;

    Abstract : The Middle Iron Age on Öland (around 200-550 AD) is often regarded as a prosperous period witha wealth based on animal husbandry. In this study charred cereals from several Iron Age sites atÖland are studied to answer questions about prehistoric diet and agricultural practices. READ MORE

  5. 4. Lake Victoria - Carbon, Nitrogen, Phosphorus and Stable Isotope (δ13C) comparison between lake and catchment sediments

    University essay from Linköpings universitet/Tema Miljöförändring

    Author : Laxmi Gayatri Devi Basapuram; [2018]
    Keywords : Nutrients; Stable isotope δ13C ; Agriculture; Industrialization; Eutrophication;

    Abstract : Lake Victoria situated in East Africa faces an acute problem with eutrophication. Many reasons like agricultural production, industrialization, anthropogenic processes, the introduction of species, and economic activities have caused a stress to the overall well-being of the lake. READ MORE

  6. 5. Nitrogen transformations at the Kiruna mine : The use of stable nitrogen isotopes to trace nitrogen-transforming processes

    University essay from Uppsala universitet/Luft-, vatten- och landskapslära

    Author : Lino Nilsson; [2013]
    Keywords : Nitrogen; Nitrogen processes; Isotopes; Isotope tracers; Stable isotopes; Mines; Isotope analysis; Dual isotope analysis; Kväve; Kväveprocesser; Isotoper; Spårningsisotoper; Spårningsmetod; Gruvor; Isotopanalys;

    Abstract : Release of different nitrogen compounds can cause eutrophication in lakes and rivers whichcan lead to oxygen-free environments in bottom water and in the sediment and can in turnlead to fish-deaths. Ammonium can be toxic to biota and nitrate can in high concentrationeven be toxic to humans. READ MORE