Essays about: "stable isotopes"

Showing result 6 - 10 of 42 essays containing the words stable isotopes.

  1. 6. 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. 7. Arctica Islandica – Annually Banded Mollusc Offers High Temporal Resolution Record Into End Of North Sea Little Ice Age

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Eilidh Towers; [2022]
    Keywords : sclerochronology; Arctica islandica; palaeoenvironments; Little Ice Age; radiocarbon reservoir effect;

    Abstract : Sclerochronology affirms the well-established fact that banded growth increments in marine molluscs accurately record oscillations in climate and environment for the past millennia or more. This study considers how such records can enhance understanding of environmental shifts across the 18th to 20th centuries. READ MORE

  4. 8. The Eemian Baltic Sea hydrography and paleoenvironment based on foraminiferal geochemistry

    University essay from Lunds universitet/Geologiska institutionen

    Author : Julia Chonewicz; [2020]
    Keywords : trace elements; benthic foraminifera; last interglacial; temperature reconstruction; geochemistry; Earth and Environmental Sciences;

    Abstract : I den här masteruppsatsen undersöktes geokemin i kalkskalen av bottenlevande foraminiferer från Anholt (Kattegat), Ristinge (Bälthavet) och Obrzynowo (Egentliga Östersjön), för att rekonstruera de hydrografiska förhållanden i Östersjön och paleomiljön under den senaste interglacialen (130 - 115 ka BP). De variabler som analyserades innefattade Mg/Ca, Ba/Ca och Mn/Ca samt stabila syre- och kolisotoper (δ18O och δ13C) i kombination med data från tidigare studier och modern hydrografi. READ MORE

  5. 9. An annual evaluation of CH4 oxidation in a freshwater lake

    University essay from Linköpings universitet/Tema Miljöförändring

    Author : Eldina Cehic; [2020]
    Keywords : Methane oxidation; isotopic fractionation; stratification; open steady-state and closed system.; Metanoxidation; isotopfraktionering; stratifiering; öppet stabilt system och stängt system;

    Abstract : Freshwater lakes constrain its methane (CH4) emissions through CH4 oxidation. CH4 includes three carbon (C) isotopes; the stable isotopes 12C,13C and the unstable and more uncommon isotope 14C. Methanotrophs (i.e. READ MORE

  6. 10. 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