Blar i NIVA Open Access Archive på forfatter "Andersen, Tom"
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Congruence, but no cascade - Pelagic biodiversity across three trophic levels in Nordic lakes
Andersen, Tom; Hessen, Dag Olav; Håll, Johnny Peter; Khomich, Maryia; Kyle, Marcia; Lindholm, Markus; Rasconi, Serena; Skjelbred, Birger; Thrane, Jan-Erik; Walseng, Bjørn (Peer reviewed; Journal article, 2020)Covariation in species richness and community structure across taxonomical groups (cross‐taxon congruence) has practical consequences for the identification of biodiversity surrogates and proxies, as well as theoretical ... -
Dioksiner i Grenlandsfjordene – DIG. Oppsummering av forskningsprosjektet
Næs, Kristoffer; Persson, Johan; Saloranta, Tuomo; Andersen, Tom; Berge, John Arthur; Hylland, Ketil; Ruus, Anders; Tobiesen, August; Bergstad, Odd Aksel; Knutsen, Jan Atle (NIVA-rapport;4876, Research report, 2004)Grenlandsfjordene har mottatt store tilførsler av dioksiner fra Norsk Hydros magnesiumfabrikk på Herøya (1951-2002). Forurensningen har ført til restriksjoner og råd knyttet til omsetning og inntak av sjømat fra området. ... -
Do DOM quality and origin affect the uptake and accumulation of lipid-soluble contaminants in coastal filter feeders? An experimental simulation of teflubenzuron exposure to blue mussels
Schultze, Sabrina; Andersen, Tom; Knudtzon, Nina Cathrine; Ruus, Anders; Rundberget, Jan Thomas; Brooks, Steven; Poste, Amanda Elizabeth; Hessen, Dag Olav; Borgå, Katrine (Peer reviewed; Journal article, 2023)The increased export of terrestrial dissolved organic matter (terrDOM) to coastal marine ecosystems may affect local filter feeders and the local food web via the altered uptake of organic material and associated contaminants. ... -
Environmental Optima for Seven Strains of Pseudochattonella (Dictyochophyceae, Heterokonta)
Skjelbred, Birger; Edvardsen, Bente; Andersen, Tom (Journal article; Peer reviewed, 2013)The ichthyotoxic flagellate Pseudochattonella has formed recurrent blooms in the North Sea, Skagerrak and Kattegat since 1998. Five strains of Pseudochattonella farcimen and two strains of P. verruculosa were examined in ... -
Eutropia: Integrated Valuation of Lake Eutrophication Abatement Decisions Using a Bayesian Belief Network
Barton, David N; Andersen, Tom; Bergland, Olvar; Engebretsen, Alexander; Moe, S. Jannicke; Orderud, Geir I; Tominaga, Koji; Romstad, Eirik; Vogt, Rolf D (Chapter, 2016)The term “integrated valuation” is defined and its relevance is discussed in terms of bridging the gap between cost-effectiveness analysis and economic valuation in the implementation of the European Union Water Framework ... -
From greening to browning: Catchment vegetation development and reduced S-deposition promote organic carbon load on decadal time scales in Nordic lakes
Finstad, Anders Gravbrøt; Andersen, Tom; Larsen, Søren; Tominaga, Koji; Blumentrath, Stefan; de Wit, Heleen; Tømmervik, Hans; Hessen, Dag Olav (Journal article; Peer reviewed, 2016)Increased concentrations of dissolved organic carbon (DOC), often labelled “browning”, is a current trend in northern, particularly boreal, freshwaters. The browning has been attributed to the recent reduction in sulphate ... -
Growth responses of the nuisance algae Gonyostomum semen (Raphidophyceae) to DOC and associated alterations of light quality and quantity
Hagman, Camilla Hedlund Corneliussen; Skjelbred, Birger; Thrane, Jan-Erik; Andersen, Tom; de Wit, Heleen A (Journal article; Peer reviewed, 2019)In recent decades, the freshwater alga Gonyostomum semen (Ehrenberg) Diesing has increased in abundance and distribution, which has created problems regarding the use of lakes for drinking water and recreation. Increases ... -
Growth, stoichiometry and cell size; temperature and nutrient responses in haptophytes
Skau, Lars Fredrik; Andersen, Tom; Thrane, Jan-Erik; Hessen, Dag Olav (Journal article; Peer reviewed, 2017)Temperature and nutrients are key factors affecting the growth, cell size, and physiology of marine phytoplankton. In the ocean, temperature and nutrient availability often covary because temperature drives vertical ... -
Heavy metal surveys in Nordic lakes harmonised data for regional assessment of critical limits
Skjelkvåle, B.L.; Mannio, J.; Wilander, A.; Johansson, K.; Jensen, J.P.; Fjeld, E.; Andersen, Tom; Vuorenmaa, J.; Røyset, O. (NIVA-rapport;4039, Research report, 1999)In the autumn of 1995, national lake surveys were conducted in the Nordic countries. The surveys were co-ordinated with respect to lake selection strategy, analytical methods, sampling techniques and sampling period. The ... -
Historical Planktothrix diversity across seven Norwegian lakes implies environmentally driven niche differentiation
Kyle, Marcia; Andersen, Tom; Haande, Sigrid; Rohrlack, Thomas (Journal article, 2015) -
Land-cover, climate and fjord morphology drive differences in organic matter and nutrient dynamics in two contrasting northern river-fjord systems
Schultze, Sabrina; Andersen, Tom; Hessen, Dag Olav; Ruus, Anders; Borgå, Katrine; Poste, Amanda (Peer reviewed; Journal article, 2022)Climate and land-use changes are leading to impacts on individual ecosystems as well as shifts in transfer dynamics between interconnected systems. At the land-ocean interface, changes in riverine inputs of organic matter ... -
Light acclimation in submerged macrophytes: The roles of plant elongation, pigmentation and branch orientation differ among Chara species
Schneider, Susanne Claudia; Pichler, Doris E.; Andersen, Tom; Melzer, Arnulf (Journal article; Peer reviewed, 2015)Light acclimation plays a fundamental role for plant survival. Using an experimental setup where light could only penetrate from above, we studied light acclimation of Chara intermedia and C. contraria, i.e. submerged ... -
Modelling ROS formation in boreal lakes from interactions between dissolved organic matter and absorbed solar photon flux
Wolf, Raoul; Thrane, Jan-Erik; Hessen, Dag Olav; Andersen, Tom (Journal article; Peer reviewed, 2018)Concentrations of dissolved organic matter (DOM) are increasing in a large number of lakes across the Northern hemisphere. This browning serves a dual role for biota by protecting against harmful ultraviolet radiation, ... -
Nuisance growth of Juncus bulbosus: the roles of genetics and environmental drivers tested in a large-scale survey
Moe, Therese Fosholt; Brysting, Anne Krag; Andersen, Tom; Schneider, Susanne Claudia; Kaste, Øyvind; Hessen, Dag Olav (Journal article; Peer reviewed, 2013)1. Invasive species can transform aquatic ecosystems, and the nuisance growth of the freshwater macrophyte Juncus bulbosus has become a problem in many lakes and rivers in northern Europe. It affects biodiversity strongly ... -
The role of photomineralization for CO2 emissions in boreal lakes along a gradient of dissolved organic matter
Allesson, Lina; Koehler, Birgit; Thrane, Jan-Erik; Andersen, Tom; Hessen, Dag O (Peer reviewed; Journal article, 2020)Many boreal lakes are experiencing an increase in concentrations of terrestrially derived dissolved organic matter (DOM)—a process commonly labeled “browning.” Browning affects microbial and photochemical mineralization ... -
Seasonal diversity and dynamics of haptophytes in the Skagerrak, Norway, explored by high-throughput sequencing
Egge, Elianne Sirnæs; Johannessen, Torill Vik; Andersen, Tom; Eikrem, Wenche; Bittner, Lucie; Larsen, Aud; Sandaa, Ruth-Anne; Edvardsen, Bente (Journal article, 2015)Microalgae in the division Haptophyta play key roles in the marine ecosystem and in global biogeochemical processes. Despite their ecological importance, knowledge on seasonal dynamics, community composition and abundance ... -
Seasonal variation in marine C:N:P stoichiometry: can the composition of seston explain stable Redfield ratios?
Frigstad, Helene; Andersen, Tom; Hessen, Dag Olav; Naustvoll, L..J.; Johnsen, Torbjørn Martin; Bellerby, Richard (Journal article; Peer reviewed, 2011)Seston is suspended particulate organic matter, comprising a mixture of autotrophic, heterotrophic and detrital material. Despite variable proportions of these components, marine seston often exhibits relatively small ... -
Spectrophotometric analysis of pigments: A critical assessment of a high-throughput method for analysis of algal pigment mixtures by spectral deconvolution
Thrane, Jan-Erik; Kyle, Marcia; Striebel, Maren; Haande, Sigrid; Grung, Merete; Rohrlack, Thomas; Andersen, Tom (Journal article, 2015) -
Terrestrial organic matter increases zooplankton methylmercury accumulation in a brown-water boreal lake
Poste, Amanda; Hoel, Cathrine Skaar; Andersen, Tom; Arts, Michael T.; Færøvig, Per-Johan; Borgå, Katrine (Journal article; Peer reviewed, 2019)Increases in terrestrial organic matter (tOM) transport from catchments to boreal lakes can affect methylmercury (MeHg) accumulation in aquatic biota both directly by increasing concentrations of aqueous MeHg, and indirectly ... -
The importance of year-to-year variation in meteorological and runoff forcing for water quality of a temperate, dimictic lake
Romarheim, Aleksandra Tmic; Tominaga, Koji; Riise, Gunnhild; Andersen, Tom (Journal article; Peer reviewed, 2015)Natural stochasticity can pose challenges in managing the quality of the environment, or hinder understanding of the system structure. It is problematic because unfavourable stochastic events cancel management efforts and ...