Multiscale phytoplankton dynamics in a coastal system of the eastern English Channel: the Boulogne-sur-Mer coastal area

Robache, Kévin; Hubert, Zéline; Gallot, Clémentine; Epinoux, Alexandre; Louchart, Arnaud P.; Facq, Jean-Valéry; Lefebvre, Alain; Répécaud, Michel; Cornille, Vincent; Verhaeghe, Florine; Audinet, Yann; Brutier, Laurent; Schmitt, François G.; Artigas, Luis Felipe

doi:https://doi.org/10.5194/os-21-1787-2025

Articles | Volume 21, issue 4

https://doi.org/10.5194/os-21-1787-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/os-21-1787-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 4

Research article

|

25 Aug 2025

Research article |

| 25 Aug 2025

Multiscale phytoplankton dynamics in a coastal system of the eastern English Channel: the Boulogne-sur-Mer coastal area

Kévin Robache, Zéline Hubert, Clémentine Gallot, Alexandre Epinoux, Arnaud P. Louchart, Jean-Valéry Facq, Alain Lefebvre, Michel Répécaud, Vincent Cornille, Florine Verhaeghe, Yann Audinet, Laurent Brutier, François G. Schmitt, and Luis Felipe Artigas

Data sets

High-frequency monitoring of phytoplankton functional groups using an automated flow cytometer during two deployments (2021, 2022) at the MAREL CARNOT station (Boulogne-sur-Mer, France) in the eastern English Channel Kévin Robache et al. https://doi.org/10.17882/104948

SRN Dataset - Regional Observation and Monitoring Program for Phytoplankton and Hydrology in the Eastern English Channel Alain Lefebvre et al. https://doi.org/10.17882/50832

High Frequency Measurement of the Coastal Environment in the Eastern English Channel. Data from MAREL CARNOT - COAST-HF (Coastal Ocean Observing System - High Frequency) Monitoring Programme within the Research Infrastructure ILICO MAREL Carnot https://doi.org/10.17882/39754

REFMAR SHOM https://doi.org/10.17183/REFMAR

Model code and software

EMD: Empirical Mode Decomposition and Hilbert Spectral Analysis D. Kim and H.-S. Oh https://doi.org/10.32614/CRAN.package.EMD

lomb: Lomb-Scargle Periodogram T. Ruf https://doi.org/10.32614/CRAN.package.lomb

tidyverse: Easily Install and Load the "Tidyverse" H. Wickham and RStudio https://doi.org/10.32614/CRAN.package.tidyverse

PBC ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics H. Wickham et al. https://doi.org/10.32614/CRAN.package.ggplot2

Short summary

By deploying an automated flow cytometer at a coastal monitoring station in France, we tracked phytoplankton changes every 2 h during spring (2021 and 2022) and summer (2022). Our study revealed distinct seasonal shifts, e.g., with diatoms and haptophytes in spring. Rare weather events rapidly altered community composition. We found that most variability occurred on short timescales, underscoring the importance of high-frequency monitoring for understanding marine phytoplankton dynamics.