Essays about: "foraminifera"

Showing result 6 - 10 of 16 essays containing the word foraminifera.

  1. 6. Methods and Approaches for Biogenicity Determination in Geological Samples - Implications for Extraterrestrial Search for Life

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Alexandra Zetterlind; [2018]
    Keywords : Biogenicity; microscopy; fossilized microorganisms; astrobiology; Biogenecitet; mikroskopering; fossiliserade mikroorganismer; astrobiologi;

    Abstract : For a better understanding of how to search for an extraterrestrial life, scientists study hidden biospheres on Earth. The subseafloor crust is recognized as a vast microbial habitat and it is hypothesized that extremophilic microorganisms, occurring there, can be the first living organisms on Earth. READ MORE

  3. 7. 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

  4. 8. 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

  5. 9. The paleoceanography of Kattegat during the last deglaciation from benthic foraminiferal stable isotopes

    University essay from Lunds universitet/Geologiska institutionen

    Author : Yasmin Bokhari Friberg; [2015]
    Keywords : δ13C; δ18O; Kattegat; Baltic Sea; stable isotopes; foraminifera; deglaciation; paleoceanography; Earth and Environmental Sciences;

    Abstract : En borrkärna från Anholt (Kattegatt) togs upp under IODP-expedition 347 i Östersjön. Kärnan är daterad till ~18-14 ka BP och representerar deglaciationen i slutet av Weichselistiden. READ MORE

  6. 10. Using calcein-filled osmotic pumps to study the calcification response of benthic foraminifera to induced hypoxia under in situ conditions : an experimental approach

    University essay from Lunds universitet/Geologiska institutionen

    Author : Susanne Landgren; [2015]
    Keywords : benthic foraminifera; calcein; osmotic pump; hypoxia; Gullmar Fjord; bentiska foraminiferer; kalcein; osmotisk pump; syrebrist; Gullmarn; Earth and Environmental Sciences;

    Abstract : Bentiska foraminiferer används i stor utsträckning för miljöövervakning, t ex i kontext med syrebrist i kustnära vatten, vilket är det snabbast växande och mest allvarliga hotet mot marina ekosystem. Ett flertal studier har visat att många foraminiferarter har förmåga till överlevnad, förökning och biomineralisering under förhållanden med syrebrist (hypoxi) och till och med under helt syrefria förhållanden (anoxi). READ MORE