Sökning: "nitrogen stable isotope"

Visar resultat 1 - 5 av 15 uppsatser innehållade orden 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

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Emmy Nyberg; [2022]
    Nyckelord :Aquaculture; wild fish; fat content; protein content; stable isotopes;

    Sammanfattning : 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. LÄS MER

  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

    Master-uppsats, SLU/Dept. Of Aquatic Resources

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

    Sammanfattning : 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. LÄS MER

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

    Master-uppsats, Stockholms universitet/Arkeologiska forskningslaboratoriet

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

    Sammanfattning : 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. LÄS MER

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

    Master-uppsats, Linköpings universitet/Tema Miljöförändring

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

    Sammanfattning : 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. LÄS MER

  7. 5. Relationen mellan status och diet i det medeltida Västerhus på Frösön i Jämtland : En dietstudie med kol- och kväveisotopanalyser

    Kandidat-uppsats, Stockholms universitet/Institutionen för arkeologi och antikens kultur

    Författare :Amanda Jakobsson; [2016]
    Nyckelord :Medeltid; Jämtland; Isotopanalys; Diet;

    Sammanfattning : This paper deals with stable isotope analysis of carbon and nitrogen on skeletal remains from the medieval cemetery in Västerhus, Jämtland. Samples from seven different individuals were analyzed, taken from both teeth and bone tissue. LÄS MER