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Phytoplankton dynamics and bloom events in oligotrophic Mediterranean lagoons: seasonal patterns but hazardous trends

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Abstract

Detailed seasonal analyses of phytoplankton assemblages’ composition were performed on long-term datasets (20 years) of two oligotrophic Mediterranean lagoons (Diana and Urbino), in order to test if phytoplankton community and bloom events patterns rely on a seasonal basis. Our results highlight a similar phytoplankton composition between the lagoons, but different patterns in terms of phytoplankton abundances, of timing, magnitude and occurrence of Taxonomic Units, and of bloom events occurrence. Dominant diatoms group showed a seasonal repartition, with highest contribution of Skeletonema sp. during winter and spring, some other groups emerging in warmer seasons (e.g. Chaetoceros spp.), or not showing marked seasonality (e.g. Pseudo-nitzschia spp.). Dinoflagellates’ abundances were higher during autumn, besides exhibiting punctual proliferations over the year. Salinity was the strongest environmental parameter in controlling Diana lagoon phytoplankton community, while Urbino community was mostly controlled by turbidity. A worrying evolution of the toxic diatom Pseudo-nitzschia spp., linked to salinity and temperature changes, was detected in both lagoons. We further demonstrated changes in the phytoplankton community are ongoing in these lagoons, despite their contrasting human pressure contexts, indicating that serious impacts on phytoplankton dynamics and blooms triggering in Mediterranean lagoons shall be foreseen within the current and forecasted climate change scenarios.

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Availability of data and material

The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request. The long-term datasets analysed during the current study are available in the REPHY repository, https://doi.org/10.17882/47248.

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Acknowledgements

The authors are grateful to the Diana aquaculture exploiters and the Urbino lagoon team at Corsican Regional Council for their cooperation during field investigations. Viviana Ligorini was awarded a grant from the Corsican Regional Council and the University of Corsica. This study was supported by funding from the French Government and from the Corsican Regional Council (CPER Gerhyco project). This study was based on data collected during the projects REPHY and Water Framework Directive, which received financial support from Ifremer and Agence de l'Eau Rhône Méditerranée Corse.

Funding

Viviana Ligorini was awarded a grant from the Corsican Regional Council and the University of Corsica. This study was supported by funding from the French Government and from the Corsican Regional Council (CPER Gerhyco project). This study was based on data collected during the projects REPHY and Water Framework Directive, which received financial support from Ifremer and Agence de l'Eau Rhône Méditerranée Corse.

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Ligorini, V., Malet, N., Garrido, M. et al. Phytoplankton dynamics and bloom events in oligotrophic Mediterranean lagoons: seasonal patterns but hazardous trends. Hydrobiologia 849, 2353–2375 (2022). https://doi.org/10.1007/s10750-022-04874-0

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  • DOI: https://doi.org/10.1007/s10750-022-04874-0

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