Evaluation of the complexity and performance of marine planktonic trophic models

Leles, Suzana Gonçalves; Valentin, Jean Louis; Figueiredo, Gisela M.

doi:10.1590/0001-3765201620150588

Cited by 19 publications

(14 citation statements)

References 89 publications

(68 reference statements)

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“…This conclusion is consistent with the observations from many other studies of protistan herbivory (Lawrence and Menden‐Deuer and references within), yet it conflicts with a generally observed functional response of zooplankton, i.e., that ingestion rates increase, albeit not always linearly, with prey density (Ivlev ; Holling ; Frost ). The observed lack of seasonality in grazing rates implies that the functions traditionally used to describe zooplankton grazing in plankton models (Franks ; Li et al ; Leles et al ) may not be universally applicable to microzooplankton grazing, especially when bulk indices of prey abundance such as chlorophyll are used.…”

Section: Discussionmentioning

confidence: 99%

Seasonal similarity in rates of protistan herbivory in fjords along the Western Antarctic Peninsula

Morison

Menden‐Deuer

2018

Limnology & Oceanography

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We quantified phytoplankton growth and protistan grazing rates during late austral autumn 2013 and late austral spring 2014, in several glacio‐marine fjords and connecting channels along the Western Antarctic Peninsula (WAP). During austral autumn, low and declining chlorophyll a (Chl a) concentrations (≤ 0.4 μg L−1) were almost entirely composed of pico/nanophytoplankton, whereas during austral spring, high but patchy Chl a concentrations in the fjords (up to 18.5 μg L−1) reflected a diatom bloom. These contrasting dynamics were associated with high seasonal differences in irradiance, but not temperature, and were consistent with the balance resulting from lower phytoplankton growth rates in autumn (−0.01 d−1 to 0.19 d−1) than in spring (0.06–0.93 d−1) but similar magnitudes of herbivorous grazing in both seasons. Grazing was either absent or low (0.11–0.26 d−1) and restricted to the picophytoplankton and nanophytoplankton. In the productive fjords lining the WAP, a fraction of primary production was channelled through a persistent and across‐seasons equally active microbial food web, while during spring an increasing fraction of organic carbon shifted from trophic transfer and recycling to an export pathway.

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Section: Discussionmentioning

confidence: 99%

Seasonal similarity in rates of protistan herbivory in fjords along the Western Antarctic Peninsula

Morison

Menden‐Deuer

2018

Limnology & Oceanography

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“…Anderson, 2005Anderson, , 2006Le Quere, 2006;Flynn, 2006;Leles et al, 2016;Shimoda and Arhonditsis, 2016). It remains an open question as to whether additional complexity is of advantage for representing biogeochemical processes and tracers on a global scale (i.e.…”

Section: Introductionmentioning

confidence: 99%

Calibration of a simple and a complex model of global marine biogeochemistry

Kriest

2017

Biogeosciences

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Abstract. The assessment of the ocean biota's role in climate change is often carried out with global biogeochemical ocean models that contain many components and involve a high level of parametric uncertainty. Because many data that relate to tracers included in a model are only sparsely observed, assessment of model skill is often restricted to tracers that can be easily measured and assembled. Examination of the models' fit to climatologies of inorganic tracers, after the models have been spun up to steady state, is a common but computationally expensive procedure to assess model performance and reliability. Using new tools that have become available for global model assessment and calibration in steady state, this paper examines two different model types -a complex seven-component model (MOPS) and a very simple four-component model (RetroMOPS) -for their fit to dissolved quantities. Before comparing the models, a subset of their biogeochemical parameters has been optimised against annual-mean nutrients and oxygen. Both model types fit the observations almost equally well. The simple model contains only two nutrients: oxygen and dissolved organic phosphorus (DOP). Its misfit and large-scale tracer distributions are sensitive to the parameterisation of DOP production and decay. The spatio-temporal decoupling of nitrogen and oxygen, and processes involved in their uptake and release, renders oxygen and nitrate valuable tracers for model calibration. In addition, the non-conservative nature of these tracers (with respect to their upper boundary condition) introduces the global bias (fixed nitrogen and oxygen inventory) as a useful additional constraint on model parameters. Dissolved organic phosphorus at the surface behaves antagonistically to phosphate, and suggests that observations of this tracer -although difficult to measure -may be an important asset for model calibration.

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“…These models can be three-dimensional and have the ability to describe ecosystem structure and functions in detail. Thus, they are useful tools to address questions focusing on plankton dynamics and physical oceanography (Franks and Chen, 2001;Aumont et al, 2015;Leles et al, 2016). NPZD models allow the combination of species into functional groups (Fasham, 1993), and therefore, these models can be used to investigate the impact of climate change on these functional groups.…”

Section: Npzd-based Modelsmentioning

confidence: 99%

Toward Improved Model Capacities for Assessment of Climate Impacts on Coastal Bentho-Pelagic Food Webs and Ecosystem Services

et al. 2021

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Global climate change is a key driver of change in coastal waters with clear effects on biological communities and marine ecosystems. Human activities in combination with climate change exert a tremendous pressure on marine ecosystems and threaten their integrity, structure, and functioning. The protection of these ecosystems is a major target of the 14th United Nations sustainable development goal “Conserve and sustainably use the oceans, seas and marine resources for sustainable development.” However, due to the complexity of processes and interactions of stressors, the status assessment of ecosystems remains a challenge. Holistic food web models, including biological and environmental data, could provide a suitable basis to assess ecosystem health. Here, we review climate change impacts on different trophic levels of coastal ecosystems ranging from plankton to ecologically and economically important fish and shellfish species. Furthermore, we show different food web model approaches, their advantages and limitations. To effectively manage coastal ecosystems, we need both a detailed knowledge base of each trophic level and a holistic modeling approach for assessment and prediction of future scenarios on food web-scales. A new model approach with a seamless coupling of physical ocean models and food web models could provide a future tool for guiding ecosystem-based management.

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Evaluation of the complexity and performance of marine planktonic trophic models

Cited by 19 publications

References 89 publications

Seasonal similarity in rates of protistan herbivory in fjords along the Western Antarctic Peninsula

Seasonal similarity in rates of protistan herbivory in fjords along the Western Antarctic Peninsula

Calibration of a simple and a complex model of global marine biogeochemistry

Toward Improved Model Capacities for Assessment of Climate Impacts on Coastal Bentho-Pelagic Food Webs and Ecosystem Services

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