Tidal and diel periodicities of size-fractionated phytoplankton pigment signatures at an offshore station in the southeastern English Channel

Brunet, Christophe; Lizon, Fabrice

doi:10.1016/s0272-7714(02)00323-2

Cited by 44 publications

(48 citation statements)

References 40 publications

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“…This result underlines the high nutrient concentration-requirement of this class for growth (in agreement with nutrient availability after the second dust addition), and is consistent with the presence of Chlorophyceae (at least the picophytoplankton size class) in DCM layers of oligotrophic ecosystems (Brunet et al, 2006. Chlorophyceae occurrence in the DCM has been mainly related to their pigment properties, and notably to the presence of Chl b, which is particularly suited to exploit the dim blue-light environment of such depths (Bidigare and Marra, 1990;Brunet et al, 2006). By comparing this study with previous ones (Brunet et al, 2006, we can, therefore, assume that both the low light environment and nutrient availability are the main triggers controlling the presence of nano-and microphytoplanktonic Chlorophyceae in the DCM.…”

Section: Changes In the Structure And Composition Of The Phytoplanktosupporting

confidence: 85%

“…In association with picoeukaryotes, both genera might be considered the major contributors of biomass and primary production in oligotrophic environments (Morel et al, 1993;Partensky et al, 1999). Picophytoplankton relevant contribution to total phytoplankton biomass and production is also well known in the Mediterranean Sea (Magazzù and Decembri, 1995;Casotti et al, 2003;Brunet et al, 2006Brunet et al, , 2008.…”

Section: Giovagnetti Et Al: Assessing the Role Of Dust Depositionmentioning

confidence: 97%

“…However, despite the high specific diversity and ubiquity of picoeukaryotes was reported (Moon-van der Staay et al, 2001;Díez et al, 2001;, few in field studies performed pigment analysis in fractionated samples, coupled with flow cytometry, to gain useful information on picophytoplankton community groups (Brunet et al, 2006(Brunet et al, , 2008.…”

Section: Giovagnetti Et Al: Assessing the Role Of Dust Depositionmentioning

confidence: 99%

“…pigment determination on fractionated samples is relevant in providing size-related taxonomical information (e.g., Brunet and Lizon, 2003;Brunet et al, 2006Brunet et al, , 2007. The approach used in this paper parallels flow cytometry with HPLC pigment measurements on fractionated samples to obtain deeper insights of cell size-related phytoplankton community dynamics.…”

Section: Changes In the Structure And Composition Of The Phytoplanktomentioning

confidence: 99%

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Assessing the role of dust deposition on phytoplankton ecophysiology and succession in a low-nutrient low-chlorophyll ecosystem: a mesocosm experiment in the Mediterranean Sea

Giovagnetti

Brunet²,

Conversano³

et al. 2013

Biogeosciences

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In this study, we investigate the response of the phytoplankton community, with emphasis on ecophysiology and succession, after two experimental additions of Saharan dust in the surface water layer of a low-nutrient low-chlorophyll ecosystem in the Mediterranean Sea. Three mesocosms were amended with evapocondensed dust to simulate realistic Saharan dust events, while three additional mesocosms were kept unamended and served as controls. The experiment consisted in two consecutive dust additions and samples were daily collected at different depths (−0.1, −5 and −10 m) during one week, starting before each addition occurred. Data concerning HPLC pigment analysis on two size classes (< 3 and > 3 μm), electron transport rate (ETR) vs. irradiance curves, non-photochemical fluorescence quenching (NPQ) and phytoplankton cell abundance (measured by flow cytometry), are presented and discussed in this paper. Results show that picophytoplankton mainly respond to the first dust addition, while the second addition leads to an increase of both pico- and nano-/microphytoplankton. Ecophysiological changes in the phytoplankton community occur, with NPQ and pigment concentration per cell increasing after dust additions. While biomass increases after pulses of new nutrients, ETR does not greatly vary between dust-amended and control conditions, in relation with ecophysiological changes within the phytoplankton community, such as the increase in NPQ and pigment cellular concentration. A quantitative assessment and parameterisation of the onset of a phytoplankton bloom in a nutrient-limited ecosystem is attempted on the basis of the increase in phytoplankton biomass observed during the experiment. The results of this study are discussed focusing on the adaptation of picophytoplankton to nutrient limitation in the surface water layer, as well as on size-dependent competition ability in phytoplankton

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Section: Changes In the Structure And Composition Of The Phytoplanktosupporting

confidence: 85%

Section: Giovagnetti Et Al: Assessing the Role Of Dust Depositionmentioning

confidence: 97%

Section: Giovagnetti Et Al: Assessing the Role Of Dust Depositionmentioning

confidence: 99%

Section: Changes In the Structure And Composition Of The Phytoplanktomentioning

confidence: 99%

See 2 more Smart Citations

Assessing the role of dust deposition on phytoplankton ecophysiology and succession in a low-nutrient low-chlorophyll ecosystem: a mesocosm experiment in the Mediterranean Sea

Giovagnetti

Brunet²,

Conversano³

et al. 2013

Biogeosciences

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“…Indeed, the reduced mixing and reduced mixed-layer depth are more beneficial to large phytoplankton, mainly fast-growing diatoms, that are less efficient at low light levels than smaller cells. This result is in good agreement with observational data [Brunet and Lizon, 2003;Maguer et al, 2015] that also highlighted a greater contribution of large opportunistic cells as mixed-layer depth is shallowing. In the Iroise Sea, Landeira et al [2014] also found an increase in the abundance of diatoms cells between spring and neap tide despite the fact that the diatom chain length is generally shorter (i.e., larger proportion of solitary cells) at neap tides in order to increase the nutrient uptake efficiency [Pahlow et al, 1997].…”

Section: 1002/2017gl074173supporting

confidence: 91%

Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem

Cadier

Gorguès

L’Helguen

et al. 2017

Geophysical Research Letters

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In some regions, tidal energy can be a key factor in the generation of variability in physical and biogeochemical properties throughout the water column. We use a numerical model resolving tidal cycles and simulating diversity in phytoplankton to assess the impact of tidal mixing on vertical stability and phytoplankton community (total biomass and diversity) in a macrotidal sea (Iroise Sea, France). Two different time scales have been considered: semidiurnal and spring/neap tidal cycles. Our results show that the latter is the one primarily influencing the phytoplankton growth conditions by modifying the vertical stratification. During spring tide, the growth is rather light limited, whereas neap tide conditions lead to vertical stabilization and better light conditions in the shallow surface layer. The transition from high to low tidal mixing conditions is thus associated with a total phytoplankton biomass increase (caused by the rapid development of fast‐growing diatoms) and reduced phytoplankton diversity.

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Marine and Estuarine Microalgal Sediment Toxicity Tests

2004

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Current guidelines for toxicity bioassays concerned with marine or estuarine sediments do not include any probe involving elements from the microphytobenthos [microalgae living on the surface of the (temporary or not) submerged sediments], in spite of the importance of the benthic microflora on coastal trophic and geodynamical processes. Here, a revision of the importance of microphytobenthos in the benthic trophic nets as well as in the structure of the upper part of the marine coastal and estuarine sediments is performed, and the most recent efforts to develop sediment toxicity bioassays on marine microphytobenthos are reviewed and discussed. The benthic mobil pennate diatom Cylindrotheca closterium (formerly known as Nitzschia closterium ) seems to be a good target organism in toxicity testing for marine and estuarine sediments because of its easy handling, fast growth, sensitivity, low nutritional requirements, and wide distribution in temperate coastal waters. Additionally, there exists a good literature background about this species.

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Tidal and diel periodicities of size-fractionated phytoplankton pigment signatures at an offshore station in the southeastern English Channel

Cited by 44 publications

References 40 publications

Assessing the role of dust deposition on phytoplankton ecophysiology and succession in a low-nutrient low-chlorophyll ecosystem: a mesocosm experiment in the Mediterranean Sea

Assessing the role of dust deposition on phytoplankton ecophysiology and succession in a low-nutrient low-chlorophyll ecosystem: a mesocosm experiment in the Mediterranean Sea

Tidal cycle control of biogeochemical and ecological properties of a macrotidal ecosystem

Marine and Estuarine Microalgal Sediment Toxicity Tests

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