Opin vísindi

Browsing Doktorsritgerðir- HÍ by Department "Líf- og umhverfisvísindadeild (HÍ)"

Browsing Doktorsritgerðir- HÍ by Department "Líf- og umhverfisvísindadeild (HÍ)"

Sort by: Order: Results:

  • Scully, Sean (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2019-05-31)
    The protein and amino acid metabolism of thermophilic bacteria has been a neglected aspect of their physiology despite its biotechnological potential. Under anaerobic conditions, the metabolism of many proteogenic amino acids requires the presence of ...
  • Yi, Zhiqian (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2018-11-30)
    Diatoms are a major group of algae in the phytoplankton community and can be found in waters worldwide wherever sufficient nutrients and lights are present. Marine diatoms, such as Phaeodactylum tricornutum, can accumulate high levels of lipids and ...
  • Larranaga, Nicolas (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2016-11)
    Diel activity, the partitioning of time between periods of activity and rest, gives insights into how organisms compete for resources in time. Some species show plasticity in the rate and timing of their activity, which enables to study associations ...
  • Silva, Teresa Sofia Giesta da (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2018-12-14)
    Krill are an important component of the Icelandic marine ecosystem. Given their important ecological niche, as conveyors of biological production between phytoplankton and higher trophic levels, fluctuations in krill abundance can have large impacts ...
  • Kubiriza, Godfrey (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2017-06)
    Although conditions for aquaculture in Uganda and East-Africa are favourable, production remains low. One of the primary limitations to aquaculture development in the region is the lack of economical aquafeeds produced from local raw materials. In ...
  • Guðbrandsson, Jóhannes (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2019-04-26)
    The four morphs of Arctic charr (Salvelinus alpinus) in Lake Þingvallavatn, Iceland, which differ in many phenotypic traits related to morphology, life history, and feeding ecology, are believed to have evolved locally within the lake after the retreat ...
  • Welling, Johannes (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2020-10)
    Climate change constitutes one of the most pressing challenges faced by tourism today. Tourism research on climate-induced environmental changes has contributed to an increase in knowledge about adaptation during the last decade. Despite a general ...
  • Eddudóttir, Sigrún Dögg (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2016-12)
    For most of the Holocene the main driver of vegetation and environmental change in Iceland was climate, although intermittent volcanic events had short term impacts. This changed with the Norse colonisation in the late 9th century AD, from when land ...
  • Knobloch, Stephen (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2019-05)
    Sponges (phylum Porifera) are considered one of the oldest extant lineages of the animal kingdom. Their close association with microorganism makes them suitable for studying early animal-microbe symbiosis and expanding our understanding of host-microbe ...
  • Mutia, Thecla Munanie (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2016-09)
    Very little is known on the ecosystem impacts of emissions from geothermal power plants. The emissions, comprising mainly of non- condensable gases (NCGs) i.e. carbon dioxide, hydrogen sulphide, methane and trace elements such as arsenic, ...
  • Beck, Samantha V. (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2019-01-30)
    Intraspecific variation in egg size and its effects on offspring fitness is well documented in fishes. Yet whether or not differential per propagule maternal investment (egg size) can influence phenotypic diversification is little understood. Arctic ...
  • Kreiling, Agnes-Katharina (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2020-10)
    Freshwater springs are thermally stable environments which are largely unaffected by changes in air temperature. They could thus have the potential to buffer rising temperatures and serve as small-scale refugia for aquatic invertebrates in a warming ...
  • Johannesdottir, Lilja (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2017-06)
    The development and expansion of agriculture throughout the world has been a major driver of biodiversity loss in recent decades. Icelandic agriculture is currently not as intense and widespread as in many other western countries, and the effects of ...
  • Basil, Sheeba Santhini (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2018)
    Lichens are a classic example of mutualism, where both partners benefit from each other. The mycobiont serves the photobiont by providing shelter, nutrients, and moisture from the environment and receives carbohydrates and sometimes fixed nitrogen from ...
  • Kokorsch, Matthias (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2018-06)
    Designing a truly sustainable fisheries management regime has been a challenge internationally. Iceland is not an exception in this regard. Icelandic fisheries and their management has gone through tremendous changes since the 1980s. The implementation ...
  • Gudmundsdottir, Ragnhildur (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2020-10)
    Crangonyx islandicus is a groundwater amphipod endemic to Iceland. Genetic analysis suggests that the species has been diverging in Iceland for at least 4.8 Myrs indicating it has survived in a subglacial refugia as Iceland was repeatedly covered by ...
  • Kristmundsson, Árni (University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences, 2018-10-30)
    Apicomplexans comprise a group of unicellular, often highly pathogenic, obligate parasites infecting both vertebrates and invertebrates, exploiting either one (monoxenous) or two hosts (heteroxenous) to complete a full reproductive life cycle. Their ...
  • Stenkewitz, Ute (University of Iceland, Faculty of Life and Environmental Sciences, 2017-05)
    The parasite fauna of the Icelandic rock ptarmigan Lagopus muta had just been described when engaging in this project in 2010. Purpose was to study the influence that parasites exhibit on ptarmigan population change over a period of 7 years (2006–2012). ...
  • Magnúsdóttir, Hildur (Háskóli Íslands, 2020-10)
    Variation in morphology of shelled marine gastropods across small spatial scales may reflect restricted population connectivity, resulting in evolutionary or plastic responses to environmental heterogeneity. Species delimitation of shelled gastropods ...
  • Magnúsdóttir, Edda (Faculty of Life and Environmental Science, University of Iceland, 2017-05-19)
    The cyclically-repeated song of the male humpback whale (Megaptera novaeangliae) is an important social display on their breeding grounds, functioning in male-male interactions and/or as a reproductive display to attract females. The songs are gradually ...