Phytoplankton Dynamics and Bio-Optical Properties
Summary
Phytoplankton underpin marine food webs and global biogeochemical cycles through photosynthesis, nutrient uptake and interactions with physical factors such as light and mixing. Their population dynamics are governed by growth, mortality and community composition, which vary in time and space due to environmental drivers and top-down controls including predation and viral lysis. Bio-optical properties of phytoplankton—including absorption, scattering and backscattering coefficients—determine how light is attenuated and redistributed in the water column, with strong implications for primary production estimates from ocean-colour remote sensing. Advances in modelling and in situ observation have elucidated links between phytoplankton size structure, pigment content and inherent optical properties, enabling more accurate retrievals of biomass and functional types from satellite and autonomous platforms. Improved parameterisations of chlorophyll-specific optical coefficients and high-resolution hyperspectral datasets have refined our understanding of how cell-level traits scale up to global patterns in ocean optics and ecosystem function.
Research from Nature Portfolio
Recent studies have combined high-frequency in situ measurements with multitrophic ecological models to reveal how diel oscillations in picocyanobacteria populations are shaped by light-dependent viral dynamics and grazer predation. These analyses demonstrate that non-canonical viral traits, modulated by irradiance, are critical to population stability over daily cycles in oligotrophic gyres. Sensitivity experiments further highlight how regional variations in viral adsorption and grazer clearance rates can shift the relative importance of top-down controls on Prochlorococcus abundance.
Earlier foundational work resolved the ‘missing backscattering’ enigma by adopting more structurally complex optical models. By representing particles as coated spheres rather than homogeneous spheres, researchers reconciled observed satellite and in situ backscattering signals and attributed the majority of backscattering to particles larger than one micrometre. This insight underscores the need to account for sub-cellular organisation and particle heterogeneity in bio-optical modelling and has informed subsequent algorithm development for ocean-colour retrievals.
Phytoplankton Dynamics and Bio-Optical Properties publication trend
The graph below shows the total number of articles in phytoplankton dynamics and bio-optical properties across all publications each year (not limited to Nature Index journals).
Technical terms
Chlorophyll-a concentration: A proxy for phytoplankton biomass based on the pigment responsible for photosynthesis.
Inherent Optical Properties (IOPs): Light absorption and scattering characteristics of water constituents independent of illumination geometry.
Backscattering coefficient: The fraction of light scattered backwards by particles, influencing the reflectance detected by ocean-colour sensors.
Ocean-colour remote sensing: Satellite observation of water-leaving radiance used to infer phytoplankton biomass and composition.
Particulate beam attenuation coefficient: A measure of light loss due to absorption and scattering by particles per unit path length in water.
References
- Disentangling top-down drivers of mortality underlying diel population dynamics of Prochlorococcus in the North Pacific Subtropical Gyre. Nature Communications (2024).
- The open-ocean missing backscattering is in the structural complexity of particles. Nature Communications (2018).
- Coupling ecological concepts with an ocean-colour model: Parameterisation and forward modelling. Remote Sensing of Environment (2025).
- Simulated Inherent Optical Properties of Aquatic Particles using The Equivalent Algal Populations (EAP) model. Scientific Data (2023).
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