Parallelisable non-invasive biomass, fitness and growth measurement of macroalgae and other protists with nephelometry

Benoît Calmes, Martina Strittmatter, Bertrand Jacquemin, Marie-mathilde Perrineau, Céline Rousseau, Yacine Badis, J. Mark Cock, Christophe Destombe, Myriam Valero, Claire M.m. Gachon

Research output: Contribution to journalArticle

Abstract

With the exponential development of algal aquaculture and blue biotechnology, there is a strong demand for simple, inexpensive, high-throughput, quantitative phenotyping assays to measure the biomass, growth and fertility of algae and other marine protists. Here, we validate nephelometry, a method that relies on measuring the scattering of light by particles in suspension, as a non-invasive tool to measure in real-time the biomass of aquatic micro-organisms, such as microalgae, filamentous algae, as well as non-photosynthetic protists. Nephelometry is equally applicable to optic density and chlorophyll fluorescence measurements for the quantification of some microalgae, but outperforms other spectroscopy methods to quantify the biomass of biofilm-forming and filamentous algae, highly pigmented species and non-photosynthetic eukaryotes. Thanks to its insensitivity to the sample's pigmentation, nephelometry is also the method of choice when chlorophyll content varies between samples or time points, for example due to abiotic stress or pathogen infection. As examples, we illustrate how nephelometry can be combined with fluorometry or image analysis to monitor the quantity and time-course of spore release in fertile kelps or the progression of symptoms in diseased algal cultures.

Original languageEnglish
Article number101762
Number of pages10
JournalAlgal Research
Volume46
Early online date9 Jan 2020
DOIs
Publication statusE-pub ahead of print - 9 Jan 2020

Fingerprint

algae
macroalgae
microalgae
biomass
chlorophyll
fluorometry
light scattering
optics
pigmentation
biofilm
biotechnology
abiotic stress
eukaryotic cells
aquaculture
spectroscopy
spores
methodology
image analysis
fluorescence
microorganisms

Keywords

  • algal cultivation
  • nephelometry
  • biomass
  • phenotyping
  • biotechnology

Cite this

Calmes, Benoît ; Strittmatter, Martina ; Jacquemin, Bertrand ; Perrineau, Marie-mathilde ; Rousseau, Céline ; Badis, Yacine ; Cock, J. Mark ; Destombe, Christophe ; Valero, Myriam ; Gachon, Claire M.m. / Parallelisable non-invasive biomass, fitness and growth measurement of macroalgae and other protists with nephelometry. In: Algal Research. 2020 ; Vol. 46.
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Parallelisable non-invasive biomass, fitness and growth measurement of macroalgae and other protists with nephelometry. / Calmes, Benoît; Strittmatter, Martina; Jacquemin, Bertrand; Perrineau, Marie-mathilde; Rousseau, Céline; Badis, Yacine; Cock, J. Mark; Destombe, Christophe; Valero, Myriam; Gachon, Claire M.m.

In: Algal Research, Vol. 46, 101762, 01.03.2020.

Research output: Contribution to journalArticle

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AU - Calmes, Benoît

AU - Strittmatter, Martina

AU - Jacquemin, Bertrand

AU - Perrineau, Marie-mathilde

AU - Rousseau, Céline

AU - Badis, Yacine

AU - Cock, J. Mark

AU - Destombe, Christophe

AU - Valero, Myriam

AU - Gachon, Claire M.m.

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PY - 2020/1/9

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N2 - With the exponential development of algal aquaculture and blue biotechnology, there is a strong demand for simple, inexpensive, high-throughput, quantitative phenotyping assays to measure the biomass, growth and fertility of algae and other marine protists. Here, we validate nephelometry, a method that relies on measuring the scattering of light by particles in suspension, as a non-invasive tool to measure in real-time the biomass of aquatic micro-organisms, such as microalgae, filamentous algae, as well as non-photosynthetic protists. Nephelometry is equally applicable to optic density and chlorophyll fluorescence measurements for the quantification of some microalgae, but outperforms other spectroscopy methods to quantify the biomass of biofilm-forming and filamentous algae, highly pigmented species and non-photosynthetic eukaryotes. Thanks to its insensitivity to the sample's pigmentation, nephelometry is also the method of choice when chlorophyll content varies between samples or time points, for example due to abiotic stress or pathogen infection. As examples, we illustrate how nephelometry can be combined with fluorometry or image analysis to monitor the quantity and time-course of spore release in fertile kelps or the progression of symptoms in diseased algal cultures.

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