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  • 2005-2009  (11)
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  • 1
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    Chain model of phytoplankton P, N and light colimitation (2009)
    Inter Research
    In:  Marine Ecology Progress Series, 376 .
    Details
    Publication Date: 2018-06-01
    Description: Models of multiple potentially limiting nutrients currently employ either multiplicative or threshold formulations, neither of which has a sound mechanistic explanation. Despite experimental evidence that lack of P severely constrains N assimilation, this mechanism has not been considered for constructing models of multi-nutrient limitation. We construct a phytoplankton optimal growth model linking C, chlorophyll (Chl), N, and P through a limitation chain in which P limits N assimilation, N limits photosynthesis and photosynthesis limits growth. The resulting formulation possesses characteristics of both multiplicative and threshold approaches and provides a mechanistic foundation for modelling multi-nutrient and light limitation of phytoplankton growth. The model compares well with experimental observations for a variety of unicellular phytoplankton species. It is suggested that the widely held view that N and P limitation act independently of each other is based on an invalid interpretation of experimental observations and that the transition from N to P limitation occurs over a wide range of colimitation rather than a sharply-defined transition point. If the species considered in this study are representative for marine phytoplankton, our model results indicate that most phytoplankton are colimited by N and P when inorganic N and P are simultaneously exhausted in the surface ocean. The model suggests that the close match between marine inorganic (Redfield) and phytoplankton N:P ratios results from optimal nutrient utilisation but does not indicate optimality of Redfield N:P.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps07748
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Chain model of Phytoplankton Optimal Utilisation of N, P and Light (2008)
    In:  [Talk] In: Advances in Marine Ecosystem Modelling Research Symposium 2008, 25.06, Plymouth, U.K. .
    Details
    Publication Date: 2012-07-06
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 3
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    Motions in Mixed Layers: Dynamic vs. Steady State Simulations (2007)
    In:  [Talk] In: FB2 Seminar, Leibniz-Institute of Marine Sciences (IFM-GEOMAR), 05.11.2007, Kiel, Germany .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 4
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    Adaptive Plankton Model for the North Atlantic (2007)
    In:  [Talk] In: FB2 Seminar, Leibniz-Institute of Marine Sciences (IFM-GEOMAR), 21.05.2007, Kiel, Germany .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 5
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    Adaptive Modelling of Plankton Dynamics (2009)
    In:  [Invited talk] In: Workshop Theoretical Biology, 23.02, Plön .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 6
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    Modelling oceanic CO2 uptake: the relevance of zooplankton grazing (2009)
    In:  [Poster] In: Responses, Risks and Adaptation to Climate Change, 01.05.2009, Philadelphia, USA .
    Details
    Publication Date: 2012-07-06
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Poster
  • 7
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    Modelling the role of DOC in the global carbon cycle (2009)
    In:  [Other] In: ASLO Aquatic Sciences Meeting 2009, 28.01, Nice, France .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 8
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    Linking chlorophyll-nutrient dynamics to the Redfield N:C ratio with a model of optimal phytoplankton growth (2005)
    Inter Research
    In:  Marine Ecology Progress Series, 287 . pp. 33-43.
    Details
    Publication Date: 2018-05-31
    Description: The Redfield N:C ratio is a fundamental quantity in marine biogeochemistry because it is a key determinant of the efficiency of the biological carbon pump, yet no convincing explanations have been put forward for its remarkable constancy over much of the world ocean. Phytoplankton growth models have so far been unable to account for the different relationships between growth rate and N:C ratio under nutrient and light limitation, and have not been able to predict the Redfield N:C ratio. A relatively simple model of coupled chlorophyll and nutrient dynamics is developed from the premise that phytoplankton maximize growth by optimally allocating nutrient and energy resources among com- peting metabolic requirements for nutrient uptake, light-harvesting, and growth. The model reconciles nutrient and light limitation and appears valid under both balanced and non-balanced growth condi- tions. The Redfield N:C ratio and its constancy are explained as a result of evolutionary pressure towards maximizing light-limited growth rates in relatively carbon-rich oceanic waters.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps287033
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Optimal uptake kinetics: physiological acclimation explains the pattern of nitrate uptake by phytoplankton in the ocean (2009)
    Inter Research
    In:  Marine Ecology Progress Series, 384 . pp. 1-12.
    Details
    Publication Date: 2018-06-01
    Description: Phytoplankton supply the base of the marine food web and drive the biogeochemical cycles of carbon and nutrients. Over much of the ocean, their growth is limited by their uptake of nitrogen (as nitrate), which has most commonly been described by the hyperbolic Michaelis-Menten (MM) equation. However, the lack of a theory to explain variations in MM constants has hindered our ability to predict the response of marine ecosystems to changes in environmental conditions. The MM equation fits data from short-term experiments well, but does not agree with steady-state experiments over wide ranges of nutrient concentrations. In contrast, the recently developed optimal uptake kinetics (OU) does agree with the latter and can also describe the observed pattern of MM half-saturation constants from field. experiments. OU kinetics explains the observed pattern of N uptake as the result of a general physiological trade-off between nutrient uptake capacity and affinity. The existence of a general trade-off would imply a relatively high degree of predictability in the response of nutrient uptake to changing nutrient concentrations and thus provide a basis for predicting effects of climate change on marine ecosystems and biogeochemical cycles.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps08022
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Finding the optimal strategy: zooplankton feeding strategies as traits in a plankton model (2009)
    In:  [Poster] In: ASLO Aquatic Sciences Meeting, 27.01, Nice, France .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Poster
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