Browsing Bergen Open Research Archive by Author "Müller, Oliver"

Now showing items 1-20 of 24

    • Bacterial Response to Permafrost Derived Organic Matter Input in an Arctic Fjord 

      Müller, Oliver; Seuthe, Lena; Bratbak, Gunnar; Paulsen, Maria Lund (Peer reviewed; Journal article, 2018-08-06)
      The warming of the Arctic causes increased riverine discharge, coastal erosion, and the thawing of permafrost. Together, this is leading to an increased wash out of terrestrial dissolved organic matter (tDOM) into the ...

    • Biological transformation of Arctic dissolved organic matter in a NE Greenland fjord 

      Paulsen, Maria Lund; Müller, Oliver; Larsen, Aud; Møller, Eva Friis; Middelboe, Mathias; Sejr, Mikael Kristian; Stedmon, Colin A. (Peer reviewed; Journal article, 2018-12-07)
      Arctic waters are often enriched with terrestrial dissolved organic matter (DOM) characterized by having elevated visible wavelength fluorescence (commonly termed humic-like). Here, we have identified the sources of ...

    • Biotic transformation of methylmercury at the onset of the Arctic spring bloom 

      Kohler, Stephen Gustav; Heimbürger-Boavida, Lars-Eric; Assmy, Philipp Kurt Wolf; Müller, Oliver; Thiele, Stefan; Digernes, Maria Guadalupe; Ndungu, Kuria; Ardelan, Murat van (Journal article; Peer reviewed, 2024)
      Despite the lack of local anthropogenic mercury sources, methylated mercury (MeHg) concentrations in Arctic biota are higher than in biota from lower latitudes. The main entry route occurs during the bioconcentration of ...

    • Carbon Bioavailability in a High Arctic Fjord Influenced by Glacial Meltwater, NE Greenland 

      Paulsen, Maria Lund; Nielsen, Sophia Elisabeth Bardram; Müller, Oliver; Møller, Eva Friis; Stedmon, Colin A.; Juul-Pedersen, Thomas; Markager, Stiig; Sejr, Mikael Kristian; Delgado Huertas, Antonio; Larsen, Aud; Middelboe, Mathias (Peer reviewed; Journal article, 2017-06-08)
      The land-to-ocean flux of organic carbon is increasing in glacierized regions in response to increasing temperatures in the Arctic (Hood et al., 2015). In order to understand the response of the coastal ecosystem metabolism ...

    • Changes in marine prokaryote composition with season and depth over an Arctic polar year 

      Wilson, Bryan; Müller, Oliver; Nordmann, Eva-Lena; Seuthe, Lena; Bratbak, Gunnar; Øvreås, Lise (Peer reviewed; Journal article, 2017-04-13)
      As the global climate changes, the higher latitudes are seen to be warming significantly faster. It is likely that the Arctic biome will experience considerable shifts in ice melt season length, leading to changes in ...

    • A closer look into the microbiome of microalgal cultures 

      Steinrücken, Pia; Jackson, Steve; Müller, Oliver; Puntervoll, Pål; Kleinegris, Dorinde Mechtilde Meike (Journal article; Peer reviewed, 2023)
      Although bacteria are commonly co-occurring in microalgal cultivation and production systems, little is known about their community structure and how it might be affected by specific microalgal groups or growth conditions. ...

    • Disentangling the complexity of permafrost soil by using high resolution profiling of microbial community composition, key functions and respiration rates 

      Müller, Oliver; Bang‐Andreasen, Toke; White III, Richard Allen; Elberling, Bo; Taş, Neslihan; Kneafsey, Timothy J.; Jansson, Janet K; Øvreås, Lise (Peer reviewed; Journal article, 2018-12-13)
      Thawing permafrost can stimulate microbial activity, leading to faster decomposition of formerly preserved organic matter and CO2 release. Detailed knowledge about the vertical distribution of the responsible microbial ...

    • Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux 

      Kohlbach, Doreen; Goraguer, Lucie; Bodur, Yasemin V.; Müller, Oliver; Amargant Arumí, Martí; Blix, Katalin; Bratbak, Gunnar; Chierici, Melissa; Dabrowska, Anna Maria; Dietrich, Ulrike; Edvardsen, Bente; Garcia, Laura; Gradinger, Rolf Rudolf; Hop, Haakon; Jones, Elizabeth Marie; Øyvind, Lundesgaard; Olsen, Lasse Mork; Reigstad, Marit; Saubrekka, Karoline; Tatarek, Agnieszka; Wiktor, Josef Maria; Wold, Anette; Assmy, Philipp (Journal article; Peer reviewed, 2023)
      The decrease in Arctic sea-ice extent and thickness as a result of global warming will impact the timing, duration, magnitude and composition of phytoplankton production with cascading effects on Arctic marine food-webs ...

    • Glacial microbiota are hydrologically connected and temporally variable 

      Cameron, Karen; Müller, Oliver; Stibal, Marek; Edwards, Arwyn; Jacobsen, Carsten Suhr (Journal article; Peer reviewed, 2020)
      Glaciers are melting rapidly. The concurrent export of microbial assemblages alongside glacial meltwater is expected to impact the ecology of adjoining ecosystems. Currently, the source of exported assemblages is poorly ...

    • How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments 

      Müller, Oliver; Seuthe, Lena; Pree, Bernadette; Bratbak, Gunnar; Larsen, Aud; Paulsen, Maria Lund (Journal article; Peer reviewed, 2021-11-17)
      In the Arctic, seasonal changes are substantial, and as a result, the marine bacterial community composition and functions differ greatly between the dark winter and light-intensive summer. While light availability is, ...

    • Implications of a changing Arctic on microbial communities: Following the effects of thawing permafrost from land to sea 

      Müller, Oliver (Doctoral thesis, 2018-06-14)
      Climate change has severe impacts in the Arctic, where permafrost is thawing, glaciers are retreating and sea ice is melting. These physical changes are not only affecting large predators like polar bears, but also microscopic ...

    • Insect frass as a fertilizer for the cultivation of protein-rich Chlorella vulgaris 

      Steinrücken, Pia; Müller, Oliver; Böpple, Hanna; Kleinegris, Dorinde Mechtilde Meike (Journal article; Peer reviewed, 2024)
      Replacing the large amounts of chemical fertilizer with nutrients from waste or residual streams is an important factor to make microalgal production more sustainable, cost-effective, and part of a circular bioeconomy. ...

    • Interannual differences in sea ice regime in the north-western Barents Sea cause major changes in summer pelagic production and export mechanisms 

      Amargant I Arumi, Marti; Müller, Oliver; Bodur, Yasemin Vicdan; Ntinou, Iliana Vasiliki; Vonnahme, Tobias; Assmy, Philipp Kurt Wolf; Kohlbach, Doreen; Chierici, Melissa; Jones, Elizabeth Marie; Olsen, Lasse Mork; Tsagaraki, Tatiana; Reigstad, Marit; Bratbak, Gunnar; Gradinger, Rolf Rudolf (Journal article; Peer reviewed, 2024)
      The Barents Sea is a highly dynamic and productive marine ecosystem and a hotspot of global warming. Variability in sea ice extent is a common feature in the Barents Sea with substantial movements of the sea ice edge on ...

    • Multiomics in the central Arctic Ocean for benchmarking biodiversity change 

      Mock, Thomas; Boulton, William; Balmonte, John-Paul; Barry, Kevin; Bertilsson, Stefan; Bowman, Jeff; Buck, Moritz; Bratbak, Gunnar; Chamberlain, Emelia J.; Cunliffe, Michael; Creamean, Jessie; Ebenhöh, Oliver; Eggers, Sarah Lena; Fong, Allison A.; Gardner, Jessie; Gradinger, Rolf Rudolf; Granskog, Mats A.; Havermans, Charlotte; Hill, Thomas; Hoppe, Clara J.M.; Korte, Kerstin; Larsen, Aud; Müller, Oliver; Nicolaus, Anja; Oldenburg, Ellen; Popa, Ovidiu; Rogge, Swantje; Schäfer, Hendrik; Shoemaker, Katyanne; Snoeijs-Leijonmalm, Pauline; Torstensson, Anders; Valentin, Klaus; Vader, Anna; Barry, Kerrie; Chen, I-M A; Clum, Alicia; Copeland, Alex; Daum, Chris; Eloe-Fadrosh, Emiley; Foster, Brian; Foster, Bryce; Grigoriev, Igor V.; Huntemann, Marcel; Ivanova, Natalia; Kuo, Alan; Kyrpides, Nikos C.; Mukherjee, Supratim; Palaniappan, Krishnaveni; Reddy, T.B.K.; Salamov, Asaf; Roux, Simon; Varghese, Neha; Woyke, Tanja; Wu, Dongying; Leggett, Richard M.; Moulton, Vincent; Metfies, Katja (Journal article; Peer reviewed, 2022-10-17)
      Multiomics approaches need to be applied in the central Arctic Ocean to benchmark biodiversity change and to identify novel species and their genes. As part of MOSAiC, EcoOmics will therefore be essential for conservation ...

    • Overview of the MOSAiC expedition: Ecosystem 

      Fong, Allison A.; Hoppe, Clara J. M.; Aberle, Nicole; Ashjian, Carin; Assmy, Philipp Kurt Wolf; Bai, Youcheng; Bakker, Dorothee C. E.; Balmonte, John Paul; Barry, Kevin; Bertilsson, Stefan; Boulton, William; Bowman, Jeff; Bozzato, Deborah; Bratbak, Gunnar; Buck, Moritz; Campbell, Robert G.; Castellani, Giulia; Chamberlain, Emelia J.; Chen, Jianfang; Chierici, Melissa; Cornils, Astrid; Creamean, Jessie; Damm, Ellen; Dethloff, Klaus; Droste, Elise S.; Ebenhöh, Oliver; Eggers, Sarah Lena; Engel, Anja; Flores, Hauke; Fransson, Agneta; Frickenhaus, Stephan; Gardner, Jessie; Gelfman, Cecilia E.; Granskog, Mats; Graeve, Martin; Havermans, Charlotte; Heuzé, Céline; Hildebrandt, Nicole; Hill, Thomas C. J.; Hoppema, Mario; Immerz, Antonia; Jin, Haiyan; Koch, Boris P.; Kong, Xianyu; Kraberg, Alexandra C.; Lan, Musheng; Lange, Benjamin Allen; Larsen, Aud; Lebreton, Benoit; Leu, Eva Susanne; Loose, Brice; Maslowski, Wieslaw; Mavis, Camille; Metfies, Katja; Mock, Thomas; Müller, Oliver; Marcel, Nicolaus; Niehoff, Barbara; Nomura, Daiki; Nöthig, Eva-Maria; Oggier, Marc; Oldenburg, Ellen; Olsen, Lasse Mork; Peeken, Ilka; Perovich, Donald K.; Popa, Ovidiu; Rabe, Benjamin; Ren, Jian; Rex, Markus; Rinke, Annette; Rokitta, Sebastian; Rost, Björn; Sakinan, Serdar S.; Salganik, Evgenii; Schaafsma, Fokje L.; Schäfer, Hendrik; Schmidt, Katrin; Shoemaker, Katyanne; Shupe, Matthew D.; Snoeijs-Leijonmalm, Pauline; Stefels, Jacqueline; Svenson, Anders; Tao, Ran; Sinhué, Torres-Valdés; Torstensson, Anders; Toseland, Andrew; Ulfsbo, Adam; Leeuwe, Maria A. van; Vortkamp, Martina; Webb, Alison L.; Zhuang, Yanpei; Gradinger, Rolf Rudolf (Journal article; Peer reviewed, 2024)
      The international and interdisciplinary sea-ice drift expedition “The Multidisciplinary drifting Observatory for the Study of Arctic Climate” (MOSAiC) was conducted from October 2019 to September 2020. The aim of MOSAiC ...

    • Photosynthetic light requirement near the theoretical minimum detected in Arctic microalgae 

      Hoppe, Clara J. M.; Fuchs, Niels; Notz, Dirk; Anderson, Philip; Assmy, Philipp Kurt Wolf; Berge, Jørgen; Bratbak, Gunnar; Guillou, Gaël; Kraberg, Alexandra; Larsen, Aud; Lebreton, Benoit; Leu, Eva; Lucassen, Magnus; Müller, Oliver; Oziel, Laurent; Rost, Björn; Schartmüller, Bernhard; Torstensson, Anders; Wloka, Jonas (Journal article; Peer reviewed, 2024)
      Photosynthesis is one of the most important biological processes on Earth, providing the main source of bioavailable energy, carbon, and oxygen via the use of sunlight. Despite this importance, the minimum light level ...

    • Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea 

      Gawinski, Christine; Daase, Malin Hildegard Elisabeth; Primicerio, Raul; Amargant I Arumi, Marti; Müller, Oliver; Wold, Anette; Ormanzcyk, Mateusz; Kwasniewski, Slawomir; Svensen, Camilla (Journal article; Peer reviewed, 2024-03-27)
      The reduction of Arctic summer sea ice due to climate change can lead to increased primary production in parts of the Barents Sea if sufficient nutrients are available. Changes in the timing and magnitude of primary ...

    • Seasonality of the bacterial and archaeal community composition of the Northern Barents Sea 

      Thiele, Stefan; Vader, Anna; Thomson, Stuart; Saubrekka, Karoline; Petelenz-Kurdziel, Elzbieta Anna; Müller, Oliver; Bratbak, Gunnar; Øvreås, Lise (Journal article; Peer reviewed, 2023)
      The Barents Sea is a transition zone between the Atlantic and the Arctic Ocean. The ecosystem in this region is highly variable, and a seasonal baseline of biological factors is needed to monitor the effects of global ...

    • Snowmelt contribution to Arctic first-year ice ridge mass balance and rapid consolidation during summer melt 

      Lange, Benjamin A.; Salganik, Evgenii; Macfarlane, Amy; Schneebeli, Martin; Høyland, Knut Vilhelm; Gardner, Jessie; Müller, Oliver; Divine, Dmitry; Kohlbach, Doreen; Katlein, Christian; Granskog, Mats (Journal article; Peer reviewed, 2023)
      Sea ice ridges are one of the most under-sampled and poorly understood components of the Arctic sea ice system. Yet, ridges play a crucial role in the sea ice mass balance and have been identified as ecological hotspots ...

    • Spatiotemporal Dynamics of Ammonia-Oxidizing Thaumarchaeota in Distinct Arctic Water Masses 

      Müller, Oliver; Wilson, Bryan; Paulsen, Maria Lund; Rumińska, Agnieszka; Armo, Hilde R.; Bratbak, Gunnar; Øverås, Lise (Peer reviewed; Journal article, 2018-01-23)
      One of the most abundant archaeal groups on Earth is the Thaumarchaeota. They are recognized as major contributors to marine ammonia oxidation, a crucial step in the biogeochemical cycling of nitrogen. Their universal ...