T. Frede Thingstad

University of Bergen

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Gunnar Bratbak

University of Bergen

Fereidoun Rassoulzadegan

Centre National de la Recherche Scientifique

Selina Våge

University of Bergen

Aud Larsen

NORCE Norwegian Research Centre

Mikal Heldal

University of Bergen

Ruth‐Anne Sandaa

University of Bergen

Stella Psarra

Hellenic Centre for Marine Research

Paraskevi Pitta

Hellenic Centre for Marine Research

Michael D. Krom

University of Leeds

R.F.C. Mantoura

Sorbonne Université

Cooperative Institutions

University of Bergen

112

Centre National de la Recherche Scientifique

Plymouth Marine Laboratory

Sorbonne Université

Institut de Ciències del Mar

Rutgers, The State University of New Jersey

University of Copenhagen

Norwegian Institute of Marine Research

Consejo Superior de Investigaciones Científicas

Woods Hole Oceanographic Institution

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Mediterranean Pelagic Ecosystem Study: Plankton Dynamics

Fereidoun Rassoulzadegan Marta Estrada Antonio Cruzado T. Frede Thingstad Yngve Børsheim

Mediterranean Targeted Project (MTP) - MEDIPELAGOS Project, Contract MAS2-CT93-0063, Synthesis of Final Results.-- 12 pages, 1 figures

Source

Cite

Citations (0)

Differential Toxicity of Bioortogonal Non-Canonical Amino Acid Tagging (BONCAT) in Escherichia Coli

Lotta Landor Gunnar Bratbak Aud Larsen Jesslyn Tjendra T. Frede Thingstad

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

Non canonical

10.2139/ssrn.4290641

Cite

Citations (1)

Strong Seasonality and Interannual Recurrence in Marine Myovirus Communities

Applied and Environmental Microbiology (2013)

António Pagarete C.-E. T. Chow Torill Vik Johannessen Jed A. Fuhrman T. Frede Thingstad

The temporal community dynamics and persistence of different viral types in the marine environment are still mostly obscure. Polymorphism of the major capsid protein gene, g23, was used to investigate the community composition dynamics of T4-like myoviruses in a North Atlantic fjord for a period of 2 years. A total of 160 unique operational taxonomic units (OTUs) were identified by terminal restriction fragment length polymorphism (TRFLP) of the gene g23. Three major community profiles were identified (winter-spring, summer, and autumn), which resulted in a clear seasonal succession pattern. These seasonal transitions were recurrent over the 2 years and significantly correlated with progression of seawater temperature, Synechococcus abundance, and turbidity. The appearance of the autumn viral communities was concomitant with the occurrence of prominent Synechococcus blooms. As a whole, we found a highly dynamic T4-like viral community with strong seasonality and recurrence patterns. These communities were unexpectedly dominated by a group of persistently abundant viruses.

Seasonality

10.1128/aem.01075-13

Cite

Citations (39)

Supplementary material to "Exploring the distance between nitrogen and phosphorus limitation in mesotrophic surface waters using a sensitive bioassay"

⎜Enis Hrustić Risto Lignell Ulf Riebesell T. Frede Thingstad

10.5194/bg-2016-313-supplement

Cite

Citations (0)

Competition for inorganic and organic forms of nitrogen and phosphorous between phytoplankton and bacteria during an <i>Emiliania huxleyi</i> spring bloom

Biogeosciences (2008)

T. Løvdal Christiane Eichner Hans‐Peter Grossart Vincent Carbonnel Lei Chou

Abstract. Using 15N and 33P, we measured the turnover of organic and inorganic nitrogen (N) and phosphorus (P) substrates, and the partitioning of N and P from these sources into two size fractions of marine osmotrophs during the course of a phytoplankton bloom in a nutrient manipulated mesocosm. The larger size fraction (>0.8 μm), mainly consisting of the coccolithophorid Emiliania huxleyi, but also including an increasing amount of large particle-associated bacteria as the bloom proceeded, dominated uptake of the inorganic forms NH4+, NO3−, and PO43−. The uptake of N from leucine, and P from ATP and dissolved DNA, was initially dominated by the 0.8–0.2 μm size fraction, but shifted towards dominance by the >0.8 μm size fraction as the system turned to an increasing degree of N-deficiency. Normalizing uptake to biomass of phytoplankton and heterotrophic bacteria revealed that organisms in the 0.8–0.2 μm size fraction had higher specific affinity for leucine-N than those in the >0.8 μm size fraction when N was deficient, whereas the opposite was the case for NH4+. There was no such difference regarding the specific affinity for P substrates. Since heterotrophic bacteria seem to acquire N from organic compounds like leucine more efficiently than phytoplankton, our results suggest different structuring of the microbial food chain in N-limited relative to P-limited environments.

Emiliania huxleyi

Spring bloom

Redfield ratio

Mesocosm

Bloom

10.5194/bg-5-371-2008

Cite

Citations (30)

Microbial Processes and the Biological Carbon Pump

Springer eBooks (1993)

T. Frede Thingstad

Biological pump

Carbon fibers

10.1007/978-3-642-84602-1_9

Cite

Citations (10)

Optimal Defense Strategies in an Idealized Microbial Food Web under Trade-Off between Competition and Defense

PLoS ONE (2014)

Selina Våge Julia E. Storesund Jarl Giske T. Frede Thingstad

Trophic mechanisms that can generate biodiversity in food webs include bottom-up (growth rate regulating) and top-down (biomass regulating) factors. The top-down control has traditionally been analyzed using the concepts of "Keystone Predation" (KP) and "Killing-the-Winner" (KtW), predominately occuring in discussions of macro- and micro-biological ecology, respectively. Here we combine the classical diamond-shaped food web structure frequently discussed in KP analyses and the KtW concept by introducing a defense strategist capable of partial defense. A formalized description of a trade-off between the defense-strategist's competitive and defensive ability is included. The analysis reveals a complex topology of the steady state solution with strong relationships between food web structure and the combination of trade-off, defense strategy and the system's nutrient content. Among the results is a difference in defense strategies corresponding to maximum biomass, production, or net growth rate of invading individuals. The analysis thus summons awareness that biomass or production, parameters typically measured in field studies to infer success of particular biota, are not directly acted upon by natural selection. Under coexistence with a competition specialist, a balance of competitive and defensive ability of the defense strategist was found to be evolutionarily stable, whereas stronger defense was optimal under increased nutrient levels in the absence of the pure competition specialist. The findings of success of different defense strategies are discussed with respect to SAR11, a highly successful bacterial clade in the pelagic ocean.

Strategist

10.1371/journal.pone.0101415

Cite

Citations (33)

Methods and Technologies to Assess Viral Interactions in the Aquatic World

Caister Academic Press eBooks (2018)

Stéphan Jacquet Kevin Xu Zhong Peter Peduzzi T. Frede Thingstad Kaarle Joonas Parikka

à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

10.21775/9781910190852.15

Cite

Citations (1)

Seasonal nutrient dynamics in the P depleted Eastern Mediterranean Sea

Deep Sea Research Part I Oceanographic Research Papers (2021)

Tal Ben Ezra Michael D. Krom Anat Tsemel Ilana Berman‐Frank Barak Herut

Prochlorococcus

Dominance (genetics)

Seasonality

10.1016/j.dsr.2021.103607

Cite

Citations (30)

Bacteria—protist interactions and organic matter degradation under P‐limited conditions: Analysis of an enclosure experiment using a simple model

Limnology and Oceanography (1999)

T. Frede Thingstad Harry Havskum Hanne Kaas Torkel Gissel Nielsen Bo Riemann

An enclosure experiment was performed in the brackish layer of a Norwegian fjord, a system where both phytoplankton and bacterial growth have previously been hypothesized to be phosphorus (p) limited. All enclosures had a succession pattern characterized by an initial autotrophic phase with positive net community production, increasing phytoplankton primary production, and chlorophyll, followed by a heterotrophic phase with decline in primary production, negative net community production, increased community respiration, bacterial production, and biomass. Daily additions of phosphate increased the amplitudes of both the autotrophic and the heterotrophic phases of this succession. Because no stimulating effect of glycine addition on bacterial production or on community respiration was observed, the delay in bacterial response could not easily be explained as a delay in production or availability of carbon substrates for the bacteria. An alternative hypothesis is that bacterial production is regulated by a combination of P‐limited bacterial growth rate and predatory control of bacterial biomass. A simple numerical model based on this hypothesis was able to reproduce the main features of the observed pattern of succession.

Autotroph

Nitrospira

10.4319/lo.1999.44.1.0062

Cite

Citations (56)