• Assessment of the ecological quality status of the Sepetiba Bay (SE Brazil): When metabarcoding meets morphology on foraminifera 

      Damasceno, Fabrício Leandro; Martins, Maria Virgínia; Frontalini, Fabrizio; Pawlowski, Jan; Cermakova, Kristina; Barrenechea Angeles, Inés; Santos, Luiz Guilherme Costa; Mendonça Filho, João Graciano; Francescangeli, Fabio; Senez-Mello, Thaise M.; Castelo, Wellen Fernanda Louzada; Rebouças, Renata Cardia; Duleba, Wania; Sousa, Silvia Helena de Mello; Laut, Lazaro; Antonioli, Luzia (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-09)
      In recent years, the region surrounding Sepetiba Bay (SB; SE Brazil) has become a hub of intense urban expansion and economic exploitation in response to ore transport and industrial and port activities. As a result, contaminants have been introduced into the bay, leading to an overall worsening of the environmental quality. The present work applies for the first time a foraminiferal morphology-based ...
    • Assigning the unassigned: A signature-based classification of rDNA metabarcodes reveals new deep-sea diversity 

      Barrenechea Angeles, Inés; Nguyen, Ngoc-Loi; Greco, Mattia; Tan, Koh Siang; Pawlowski, Jan (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-29)
      Environmental DNA metabarcoding reveals a vast genetic diversity of marine eukaryotes. Yet, most of the metabarcoding data remain unassigned due to the paucity of reference databases. This is particularly true for the deep-sea meiofauna and eukaryotic microbiota, whose hidden diversity is largely unexplored. Here, we tackle this issue by using unique DNA signatures to classify unknown metabarcodes ...
    • Asynchronous response of marine-terminating outlet glaciers during deglaciation of the Fennoscandian Ice Sheet 

      Stokes, Chris R.; Corner, Geoffrey D.; Winsborrow, Monica; Husum, Katrine; Andreassen, Karin (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-03-31)
      Recent studies have highlighted the dynamic behavior of marine-terminating outlet glaciers over decadal time scales, linked to both atmospheric and oceanic warming. This helps explain episodes of nearly synchronous fl ow acceleration, thinning, and retreat, but nonclimatic factors such as changes in fjord width and depth, can also induce rapid recession. There is support for these topographic ...
    • Atypical biological features of a new cold seep site on the LofotenVesterålen continental margin (northern Norway) 

      Sen, Arunima; Himmler, Tobias; Hong, Wei-Li; Chitkara, Cheshtaa; Lee, Raymond W.; Ferré, Benedicte; Lepland, Aivo; Knies, Jochen (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-11)
      A newly discovered cold seep from the Lofoten-Vesterålen margin (Norwegian Sea) is dominated by the chemosymbiotrophic siboglinid <i>Oligobrachia haakonmosbiensis</i> like other high latitude seeps, but additionally displays uncharacteristic features. Sulphidic bottom water likely prevents colonization by cnidarians and sponges, resulting in fewer taxa than deeper seeps in the region, representing ...
    • Authigenesis of biomorphic apatite particles from Benguela upwelling zone sediments off Namibia: The role of organic matter in sedimentary apatite nucleation and growth 

      Mänd, Kaarel; Kirsimäe, Kalle; Lepland, Aivo; Crosby, Chris H.; Bailey, Jake V.; Konhauser, Kurt O.; Wirth, Richard; Schreiber, Anja; Lumiste, Kaarel (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-30)
      Sedimentary phosphorites comprise a major phosphorus (P) ore, yet their formation remains poorly understood. Extant polyphosphate‐metabolizing bacterial communities are known to act as bacterial phosphate‐pumps, leading to episodically high dissolved phosphate concentrations in pore waters of organic‐rich sediment. These conditions can promote the precipitation of amorphous precursor phases that are ...
    • Autochthonous origin of the Encruzilhada Block, Dom Feliciano Belt, southern Brazil, based on aerogeophysics, image analysis and PT-paths 

      De Toni, Giuseppe Betino; Bitencourt, Maria de Fatima; Konopásek, Jiří; Battisti, Matheus Ariel; da Costa, Elisa Oliveira; Savian, Jairo Francisco (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-04)
      The Encruzilhada Block lies between the eastern hinterland and western foreland of the Dom Feliciano Belt (southern Brazil) and its tectonic meaning in the orogenic evolution of the belt is still poorly understood. Its low magnetic signal is similar to that of the foreland supracrustal sequences, whereas the high gammaspectrometric signal appears due to the hinterland post-collisional granitoids. ...
    • Automated mapping of glacial overdeepenings beneath contemporary ice sheets: Approaches and potential applications 

      Patton, Henry; Swift, Darrel A.; Clark, Chris D.; Livingstone, Stephen J.; Cook, Simon J.; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-17)
      Awareness is growing on the significance of overdeepenings in ice sheet systems. However, a complete understanding of overdeepening formation is lacking, meaning observations of overdeepening location and morphometry are urgently required to motivate process understanding. Subject to the development of appropriate mapping approaches, high resolution subglacial topography data sets covering the whole ...
    • Autonomous methane seep site monitoring offshore western Svalbard: hourly to seasonal variability and associated oceanographic parameters 

      Dølven, Knut Ola; Ferré, Benedicte; Silyakova, Anna; Jansson, Pär; Linke, Peter; Moser, Manuel (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-18)
      Improved quantification techniques of natural sources are needed to explain variations in atmospheric methane. In polar regions, high uncertainties in current estimates of methane release from the seabed remain. We present unique 10- and 3-month time series of bottom water measurements of physical and chemical parameters from two autonomous ocean observatories deployed at separate intense seabed ...
    • Baseline undersøkelse av studiekvalitet og undervisningskultur på Institutt for geovitenskap ved UiT Norges arktiske universitet 

      Martens, Iver; Malm, Rie Hjørnegaard (Research report; Forskningsrapport, 2019-04)
      Institutt for geovitenskap ved UiT Norges arktiske universitet ønsker å gjøre en innsats for å forbedre undervisningen ved instituttet. Instituttet tilbyr utdanninger på bachelor-, master- og doktorgradsnivå, med 12 bachelorkurs, 28 masterkurs og 9 kurs på doktorgradsnivå. Dette prosjektet fokuserer på undervisningskvaliteten på bachelor- og master utdanningen. Vi håper rapporten kan bidra til ...
    • BedMachine v3: Complete bed topography and ocean bathymetry mapping of Greenland from multi-beam echo sounding combined with mass conservation 

      Morlighem, Mathieu; Williams, Chris N.; Rignot, Eric J.M.; An, Lu; Arndt, Jan Erik; Bamber, Jonathan L.; Catania, Ginny A.; Chauché, Nolwenn; Dowdeswell, Julian A.; Dorschel, Boris; Fenty, Ian; Hogan, Kelly A.; Howat, Ian M.; Hubbard, Alun Lloyd; Jakobsson, Martin; Jordan, Thomas M.; Kjeldsen, Kristian Kjellerup; Millan, Romain; Mayer, Larry; Mouginot, Jérémie; Noël, Brice P.Y.; O'Cofaigh, Colm; Palmer, Steven; Rysgaard, Søren; Seroussi, Hélène; Siegert, Martin J.; Slabon, Patricia; Straneo, Fiamma; van den Broeke, Michiel R.; Weinrebe, Wilhelm Reimer; Wood, Michael; Zinglersen, Karl Brix (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-18)
      Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly melts and undercuts Greenland's marine‐terminating glaciers. Here we present a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness ...
    • Benthic foraminifera as bio-indicators of chemical and physical stressors in Hammerfest harbor (Northern Norway) 

      Dijkstra, Noortje; Junttila, Juho; Skirbekk, Kari; Carroll, JoLynn; Husum, Katrine; Hald, Morten (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-01)
      We investigated benthic foraminiferal assemblages in contaminated sediments in a subarctic harbor of northern Norway to assess their utility as indicators of anthropogenic impacts. Sediments in the harbor are repositories for POPs and heavy metals supplied through discharges from industry and shipping activities. Sediment contaminant concentrations are at moderate to poor ecological quality ...
    • Benthic Foraminifera in Arctic Methane Hydrate Bearing Sediments 

      Dessandier, Pierre-Antoine; Borrelli, Chiara; Kalenitchenko, Dimitri; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-10)
      Benthic foraminifera have been widely used as proxy for paleo-methane emissions, mainly based on their stable isotopic signature. In cold seeps, the ecology of these organisms remains uncertain, in particular their ability to thrive during active phases of seepage. In this study, we evaluate the benthic foraminiferal response to methane seepage in Arctic sediments. We do so by examining living and ...
    • Benthic foraminiferal assemblages and environmental drivers along the Kveithola Trough (NW Barents Sea) 

      Caridi, Francesca; Sabbatini, Anna; Bensi, Manuel; Kovačević, Vedrana; Lucchi, Renata Giulia; Morigi, Caterina; Povea, Patricia; Negri, Alessandra (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-14)
      We describe the population density, biodiversity and vertical distribution in the sediment of benthic foraminifera, and their relationship to environmental parameters, in the Kveithola Trough (NW Barents Sea). Two staining methods, Cell Tracker Green (CTG) and Rose Bengal (RB), were used to distinguish between living and dead tests. CTG proved to be more effective than RB, and we therefore used this ...
    • Benthic foraminiferal growth seasons implied from Mg/Ca-temperature correlations for three Arctic species 

      Skirbekk, Kari; Hald, Morten; Thomas Jr., Marchitto; Junttila, Juho; Klitgaard Kristensen, Dorthe; Sørensen, Steffen Aagaard (Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-11-22)
      Core-top sediment samples from Kongsfjorden, Svalbard, and adjacent fjord and shelf areas were collected in order to investigate a potential relationship between Mg/Ca-ratios of Arctic benthic foraminifera and the ambient bottom water temperatures (BWT). The area is influenced by large seasonal variation in factors such as light and temperature, which is further strengthened by oceanographic shifts, ...
    • Benthic foraminiferal investigations in Middle to Late Quaternary sections of Kongsfjordhallet, north-west Svalbard 

      Chatterjee, Debolina; Ghosh, Anupam; Alexanderson, Helena (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-29)
      Stratigraphic sites in north-west Svalbard record at least six significant glacial advances in the last 200 Ky, and sediments deposited under locally high relative sea level during intervening interstadials or interglacials contain abundant benthic foraminifera. We present a biostratigraphic record from the Kongsfjordhallet site in the Kongsfjorden area that covers five high relative sea-level events ...
    • The benthic foraminiferal δ34S records fux and timing of paleo methane emissions 

      Borrelli, Chiara; Gabitov, R.I.; Liu, M.-C.; Hertwig, A.T.; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-28)
      In modern environments, pore water geochemistry and modelling simulations allow the study of methane (CH<sub>4</sub>) sources and sinks at any geographic location. However, reconstructing CH<sub>4</sub> dynamics in geological records is challenging. Here, we show that the benthic foraminiferal δ<sup>34</sup>S can be used to reconstruct the fux (i.e., difusive vs. advective) and timing of CH<sub>4</sub> ...
    • The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary? 

      Koehl, Jean-Baptiste P.; Allaart, Lis (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-13)
      The Billefjorden Fault Zone is a major terrane boundary in the Norwegian Arctic. The fault separates basement rocks of Svalbard’s north-eastern and north-western terranes that recorded discrete Precambrian tectonothermal histories and were accreted, intensely deformed and metamorphosed during the Caledonian Orogeny. Although the fault represents a major, crustal-scale tectonic boundary, its north-ward ...
    • Biocryomorphology: integrating microbial processes with ice surface hydrology, topography and roughness 

      Cook, J.; Edwards, A.; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-12-02)
    • Biogeochemical Consequences of Nonvertical Methane Transport in Sediment Offshore Northwestern Svalbard 

      Treude, Tina; Krause, Stefan; Steinle, Lea; Burwicz, Ewa B.; Hamdan, L.J.; Niemann, Helge; Feseker, Tomas; Liebetrau, Volker; Krastel, Sebastian; Berndt, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-21)
      A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, ...
    • Biogeochemical evidence of anaerobic methane oxidation on active submarine mud volcanoes on the continental slope of the Canadian Beaufort Sea 

      Lee, Dong-Hun; Kim, Jung-Hyun; Lee, Yung Mi; Stadnitskaia, Alina; Jin, Young Keun; Niemann, Helge; Kim, Young-Gyun; Shin, Kyung-Hoon (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-20)
      In this study, we report lipid biomarker patterns and phylogenetic identities of key microbial communities mediating anaerobic oxidation of methane (AOM) in active mud volcanoes (MVs) on the continental slope of the Canadian Beaufort Sea. The carbon isotopic compositions (δ13C) of sn-2- and sn-3-hydroxyarchaeol showed the highly 13C-depleted values (−114 ‰ to −82 ‰) associated with a steep depletion ...