Essays about: "stable isotopes"

Showing result 16 - 20 of 42 essays containing the words stable isotopes.

  1. 16. Multistressors Related to Climate Change and Their Effects on Global Biodiversity during the Cenozoic Age

    University essay from Lunds universitet/Miljövetenskaplig utbildning

    Author : Robin Mårtensson; [2018]
    Keywords : multistressors; biodiversity; paleontology; Paleocene; Eocene; Oligocene; Miocene; Pliocene; Pleistocene; sea level; deep ocean temperature; sea surface temperature; carbon dioxide; foraminifera; ocean circulation; Cenozoic; paleoceanography; climate change; Earth and Environmental Sciences;

    Abstract : As multistressors have been shown to have significant effects on biodiversity and ecosystem functioning, the following study was made with the purpose of examining how a number of stressors specifically connected to climate change may have varied during the latest 65,5 million years and whether it is possible to predict potential effects on global biodiversity in the future. The analyses focused on global species richness during the Cenozoic age along with variables such as variations in atmospheric CO2, sea surface temperatures and global sea levels derived from analyses of various stable isotopes found in marine sediments. READ MORE

  3. 17. Quaternary Arctic foraminiferal isotopes: species reliability and palaeoceanographic application

    University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

    Author : Aron Varhelyi; [2018]
    Keywords : Palaeoceanography; Arctic; foraminifera; stable isotopes; Paleoceanografi; Arktis; foraminiferer; stabila isotoper;

    Abstract : To investigate whether foraminiferal stable isotope (δ18O/δ13C) variations have potential as a chronostratigraphic tool in the Arctic Ocean, this thesis presents new δ18O/δ13C data from five marine sediment cores. Three of those are downcore analyses (PS92/54-1; TC/PC-03; PC-07) and the remaining two are core top analyses (PC-04; PC-08). READ MORE

  4. 18. Submarine Alteration of Seamount Rocks in the Canary Islands: Insights from Mineralogy, Trace Elements, and Stable Isotopes

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Aduragbemi Oluwatobi Sofade; [2018]
    Keywords : Canary Islands; seamounts; submarine alteration; trace elements; nannofossils; Kanarieöarna; djuphavsberg; undervattensomvandling; spårämnen; nanofossiler;

    Abstract : Seamounts play an important role in facilitating the exchange of elements between the oceanic lithosphere and the overlying seawater. This water-rock interaction is caused by circulating seawater and controls the chemical exchange in submarine and sub-seafloor rocks. READ MORE

  5. 19. Peloponnesian Stalagmites and Soda Straw Stalactites as Climate Archives : Stable Isotopes in New Speleothem Material from Kapsia Cave, Peloponnese, Greece

    University essay from Stockholms universitet/Institutionen för naturgeografi

    Author : Linn Haking; [2017]
    Keywords : Stable Isotopes; Stalagmite; Soda Straw Stalactites; Climate Archive; Climate Variability; The Amount Effect; Isotopic Fractionation; Kapsia Cave; Peloponnese; Greece; Mediterranean;

    Abstract : This study presents results from stable isotope analyses of a modern stalagmite and three soda straw stalactites from Kapsia Cave, the Peloponnese, Greece. The resulting values from the stalagmite are put into context of local meteorological data, as well as previous research from Kapsia Cave. READ MORE

  6. 20. Effects of diet quality and quantity on resource use, growth and fatty-acid composition of a benthic generalist consumer.

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Adrian Grieve; [2017]
    Keywords : Food quality; allochthonous; autochthonous; consumer diet; somatic growth; fatty acids; stable isotopes.;

    Abstract : Variation in quality and quantity of food resources can affect consumer productivity responses throughout the food chain, particularly the efficiency at which basal resources are converted to consumer biomass. I performed a manipulative feeding experiment to investigate the somatic growth and fatty acid incorporation in the benthic generalist isopod Asellus aquaticus, in response to differing ratios of autochthonous (high quality algae) to allochthonous (low quality leaf litter) foods. READ MORE