Photosynthesis, carbon acquisition and primary productivity of phytoplankton: a review dedicated to Colin Reynolds

Dokulil, Martin T.; Qian, Kuimei

doi:10.1007/s10750-020-04321-y

Cited by 21 publications

(9 citation statements)

References 122 publications

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“…Here we provide primary production estimates in the GG based on dilution experiments. This technique has been already used in various marine systems, and has shown production rates that are similar to those measured by 14 C method (Moigis and Gocke 2003;Meddeb et al 2018;Dokulil and Qian 2021). Nutrients were not added to dilution bottles, assuming high nutrient concentrations in the GG during our study period.…”

Section: Productivity and Nutrient Richnessmentioning

confidence: 78%

Influence of Nutrient Gradient on Phytoplankton Size Structure, Primary Production and Carbon Transfer Pathway in a Highly Productive Area (SE Mediterranean)

et al. 2023

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We assessed the spatial variability in the size structure of phytoplankton, community composition, primary production and carbon fluxes through the planktonic food web of the Gulf of Gabès (GG; Southeastern Mediterranean Sea) in the fall of 2017 during the MERMEX-MERITE cruise. High concentrations in nutrients, chlorophyll a (2-6 µg L -1 ) and primary production (1816-3674 mg C m -2 d -1 ) revealed an eutrophic status of the studied stations in the GG. In accordance with hydrodynamic features, inorganic nutrients showed increases in concentrations from North to South and from coast to offshore, these nutrient gradients impacting the spatial distribution of phytoplankton community. Size-fractioned phytoplankton biomass and production were the lowest in the northernmost zone where they were mainly sustained by pico-sized fraction. Concomitantly, in this area, small aloricate ciliates were dominant leading to a high microbivory. Conversely, higher biomass and production were measured towards the South and offshore with prevalence of larger phytoplankton (nano-and/or micro-sized fractions) supported by diatoms. The herbivorous protozooplankton and metazooplankton were more abundant in these zones, resulting in an increase of the herbivory.The vertical particulate organic carbon flux followed also a north-south and coast-offshore increasing gradient, with a higher contribution of phytoplankton, and zooplankton fecal pellets to the sinking organic matter in the southernmost area. Our results suggest that even in nutrientrich and highly productive waters, a continuum of trophic pathways, ranging from microbial to multivorous and herbivorous food webs, may exist, which implies different efficiencies in carbon export and carrying capacity within the ecosystem.

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Section: Productivity and Nutrient Richnessmentioning

confidence: 78%

Influence of Nutrient Gradient on Phytoplankton Size Structure, Primary Production and Carbon Transfer Pathway in a Highly Productive Area (SE Mediterranean)

et al. 2023

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“…This result confirmed the higher sensitivity of the molecular response in comparison to physiological endpoints and its relevance for the early detection of potential impairment of such process (Kluender et al 2008, Pino-Otín et al 2019). Since photosynthesis is directly linked to autotroph growth and primary production, its long-term disruption might lead to impairment of biofilm structure and function and further at the ecosystem level (Dokulil and Qian 2021). Thus, the early detection and further prediction of such disruption are of major concern.…”

Section: Resultsmentioning

confidence: 99%

Metabolomics insight into the influence of environmental factors in responses of freshwater biofilms to the model herbicide diuron

Creusot

Chaumet

Éon

et al. 2021

Environ Sci Pollut Res

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Freshwater biofilms have been increasingly used during the last decade in ecotoxicology due to their ecological relevance to assess the effect(s) of environmental stress at the community level. Despite growing knowledge about the effect of various stressors on the structure and the function of these microbial communities, a strong research effort is still required to better understand their response to chemical stress and the influence of environmental stressors in this response. To tackle this challenge, untargeted metabolomics is an approach of choice because of its capacity to give an integrative picture of the exposure to multiple stress and associated effect as well as identifying the molecular pathways involved in these responses. In this context, the present study aimed to explore the use of an untargeted metabolomics approach to unravel at the molecular/ biochemical level the response of the whole biofilm to chemical stress and the influence of various environmental factors in this response. To this end, archived high-resolution mass spectrometry data from previous experiments at our laboratory on the effect of the model photosynthesis inhibitor diuron on freshwater biofilm were investigated by using innovative solutions for OMICs data (e.g., DRomics) and more usual chemometric approaches (multivariate and univariate statistical analyses). The results showed a faster (1 min) and more sensitive response of the metabolome to diuron than usual functional descriptors, including photosynthesis. Also, the metabolomics response to diuron resulted from metabolites following various trends (increasing, decreasing, U/bell shape) along increasing concentration and time. This metabolomics response was influenced by the temperature, photoperiod, and flow. A focus on a plant-specific omega-3 (eicosapentaenoic acid) playing a key role in the trophic chain highlighted the potential relevance of metabolomics approach to establish the link between molecular alteration and ecosystem structure/functioning impairment but also how complex is the response and the influence of all the tested factors on this response at the metabolomics level. Altogether, our results underline that more fundamental researches are needed to decipher the metabolomics response of freshwater biofilm to chemical stress and its link with physiological, structural, and functional responses toward the unraveling of adverse outcome pathways (AOP) for key ecosystem functions (e.g., primary production).

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“…Photosynthetic organisms release carbon dioxide during respiration, resulting in a net photosynthetic fixation of inorganic carbon in autotrophic biomass [10,5]. Net primary production (NPP)is calculated by subtracting the value of carbon losses owing to autotrophic respiration (algae respiration) from GPP [13][14][15].…”

Section: Primary Productivitymentioning

confidence: 99%

Primary Productivity of Iraqi lakes: A Review

Wahhab

Hassan

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Lentic ecosystems are important for fish production and are a critical habitat for waterfowl and numerous migratory birds. In this study we have gathered data on primary productivity of lakes across Iraq to provide updated information to strategize conservation and management. Tigris and Euphrates rivers are the primary sources of filling up major lakes in Iraq the overall assessment shows that the primary productivity is dependent on the algal composition and environmental factors with coincident role of macrophytes. An average of 37 to 637 mg carbon/m3/day of primary productivity was calculated for most of the lakes comprised of Bacillariophyceae and followed by Cyanophyceae, Chlorophyceae, Euglenophyceae, and Pyrrophyceae. It is hoped that this study can be an input to fill knowledge gaps and help to build long term maintainability of water quality and conservation of lake ecosystem across Iraq.

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Photosynthesis, carbon acquisition and primary productivity of phytoplankton: a review dedicated to Colin Reynolds

Cited by 21 publications

References 122 publications

Influence of Nutrient Gradient on Phytoplankton Size Structure, Primary Production and Carbon Transfer Pathway in a Highly Productive Area (SE Mediterranean)

Influence of Nutrient Gradient on Phytoplankton Size Structure, Primary Production and Carbon Transfer Pathway in a Highly Productive Area (SE Mediterranean)

Metabolomics insight into the influence of environmental factors in responses of freshwater biofilms to the model herbicide diuron

Primary Productivity of Iraqi lakes: A Review

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