Fine scale vertical displacement of Phaeodactylum tricornutum (Bacillariophyceae) in stratified waters: Influence of halocline and day length on buoyancy control

Erga, Svein Rune; Lie, Geir Christian; Aarø, Lars Harald; Aursland, Kjetil; Olseng, Christine Daae; Frette, Øyvind; Hamre, Børge

doi:10.1016/j.jembe.2009.11.017

Cited by 8 publications

(3 citation statements)

References 66 publications

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“…In previous experiments with AWCEMOS, the sharp halocline was found to persist for the whole experimental period, even though duration exceeding 3 to 4 d resulted in increased salinities within the upper layer over time due to evaporation (Erga et al 2003(Erga et al , 2010(Erga et al , 2015. This also appeared to be the case in the present study.…”

Section: Halocline Longevitysupporting

confidence: 72%

Growth and diel vertical migration patterns of the toxic dinoflagellate Protoceratium reticulatum in a water column with salinity stratification: the role of bioconvection and light

Erga¹,

Olseng²,

Aarø³

2015

Mar. Ecol. Prog. Ser.

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Section: Halocline Longevitysupporting

confidence: 72%

Growth and diel vertical migration patterns of the toxic dinoflagellate Protoceratium reticulatum in a water column with salinity stratification: the role of bioconvection and light

Erga¹,

Olseng²,

Aarø³

2015

Mar. Ecol. Prog. Ser.

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“…Typical sinking speeds of different types of particles in saltwater are 8.6 m day −1 for clay (Tan et al 2012;Sutherland et al 2014), 10 m day −1 for marine aggregates in Norwegian fjord water (Bach et al 2016), and for living phytoplankton from -0.4 to > 2.2 m day −1 (Peperzak et al 2003;Erga et al 2010Erga et al , 2015. Neglecting horizontal advection and assuming low degree of flocculation, SPM in the form of phytoplankton would need more than 80 and 500 d to reach sill depth and fjord bottom, respectively.…”

Section: Hydrodynamics and Particle Transport Mechanismsmentioning

confidence: 99%

The importance of microbiota and terrestrial inflows in controlling seston C:N:P:O:Si:Ca:Mn:Mg:Fe:K:Na:Cl:S:Cu:Zn stoichiometry of a deep coastal fjord

et al. 2022

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Comprehensive fjord-systems represent major extensions of the coastline and are therefore important transfer zones of materials from land to ocean. Despite increased terrestrial inflows to fjords due to climate changes, we know little about the effects on the ecosystem, especially biogeochemical cycling. We present novel data on spatiotemporal variations of seston multielement stoichiometry in the Sognefjord, the second longest (204 km) and deepest (1308 m) fjord in the world, relative to environmental conditions and microbiota. Concentration of major elements was highest in the upper brackish layer whereas trace metals and minor elements were highest close to the bottom. Seasonally varying microbiota was an important part of the seston in surface waters. None of the seston C:N:P (molar) annual means at specific depths corresponded to the Redfield ratio (106:16:1). At 5 m, annual means of N/P and C/N were 8.4 and 6.5, respectively, while at depth (50–1220 m) N/P were on scale 3 times higher (21–31) and C/N 3 times lower (1.6–2.6), suggesting alternative N-sequestration mechanisms. Overall, correlations between C-Ca and C-S indicate a strong influence from calcite (CaCO3) and organosulfur producing microorganisms, while correlations between particulate Si and Mg–K–Ca–O at depth are consistent with clay and sinking diatom frustules. Mn concentrations increased strongly towards the bottom, likely from resuspension of MnO2 rich sediments and clay particles. Based on seston concentrations, we arrived at the following stoichiometric relationship: C55N16P1Si3.6Ca3.4O16Fe0.74Mn0.51Zn0.33S0.21Cu0.08Cl1.7Na0.68Mg0.71K0.37, although rarely measured, such information is a prerequisite for evaluating environmental impact on coastal ecosystems, biogeochemical cycling, pollution risk analysis and monitoring guidelines.

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“…Although non-motile species possess the required mechanosensitive machinery to display rapid active responses to imposed mechanical stresses (triggering, for instance, the production of cytosolic Ca 2+ [22]), the effect of hydrodynamic stresses in buoyancy regulation has been largely overlooked. Overcoming adverse environmental conditions, including light and nutrient limitations, has been considered as the most relevant driver for buoyancy regulation [23][24][25]. While certainly important, more recent work suggests this is only part of the story: even under nutrient replete conditions, transcriptional analysis reveals rapid changes in gene expression solely associated with the exposure to turbulent flows.…”

Section: Introductionmentioning

confidence: 99%

Turbulence induces clustering and segregation of non-motile, buoyancy-regulating phytoplankton

Borgnino

Arrieta

Boffetta

et al. 2019

J. R. Soc. Interface.

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Turbulence plays a major role in shaping marine community structure as it affects organism dispersal and guides fundamental ecological interactions. Below oceanographic mesoscale dynamics, turbulence also impinges on subtle physical–biological coupling at the single cell level, setting a sea of chemical gradients and determining microbial interactions with profound effects on scales much larger than the organisms themselves. It has been only recently that we have started to disentangle details of this coupling for swimming microorganisms. However, for non-motile species, which comprise some of the most abundant phytoplankton groups on Earth, a similar level of mechanistic understanding is still missing. Here, we explore by means of extensive numerical simulations the interplay between buoyancy regulation in non-motile phytoplankton and cellular responses to turbulent mechanical cues. Using a minimal mechano-response model, we show how such a mechanism would contribute to spatial heterogeneity and affect vertical fluxes and trigger community segregation.

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Fine scale vertical displacement of Phaeodactylum tricornutum (Bacillariophyceae) in stratified waters: Influence of halocline and day length on buoyancy control

Cited by 8 publications

References 66 publications

Growth and diel vertical migration patterns of the toxic dinoflagellate Protoceratium reticulatum in a water column with salinity stratification: the role of bioconvection and light

Growth and diel vertical migration patterns of the toxic dinoflagellate Protoceratium reticulatum in a water column with salinity stratification: the role of bioconvection and light

The importance of microbiota and terrestrial inflows in controlling seston C:N:P:O:Si:Ca:Mn:Mg:Fe:K:Na:Cl:S:Cu:Zn stoichiometry of a deep coastal fjord

Turbulence induces clustering and segregation of non-motile, buoyancy-regulating phytoplankton

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