| Autor: |
Pauline Roux, Raffaele Siano, Philippe Souchu, Karine Collin, Anne Schmitt, Soazig Manach, Michael Retho, Olivier Pierre-Duplessix, Laetitia Marchand, Sylvia Colliec-Jouault, Victor Pochic, Maria Laura Zoffoli, Pierre Gernez, Mathilde Schapira |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Estuarine Coastal And Shelf Science (0272-7714) (Elsevier BV), 2022-09, Vol. 275, P. 107950 (13p.) |
| ISSN: |
0272-7714 |
| DOI: |
10.1016/j.ecss.2022.107950 |
| Popis: |
Blooms of the marine dinoflagellate Lepidodinium chlorophorum cause green seawater discolorations affecting the recreational use and the tourism economy along southern Brittany (NE-Atlantic, France). Hypoxic conditions associated with phytoplankton biomass recycling are suspected to cause fauna mortalities. An in situ monitoring was performed in 2019 to characterise the seasonal variability of L. chlorophorum. This species was observed from May to November, with a maximum abundance in June–July. Specific bloom sampling demonstrated a dominance of L. chlorophorum within microphytoplankton, and documented its vertical distribution. Satellite observation was used to compute the surface extent of the bloom and to highlight the importance of small-scale temporal variability, with tidal currents being a primary driver of surface distribution of the bloom. Stratification contributed to promoting the bloom of L. chlorophorum. High concentrations of phosphate and ammonium, together with transparent exopolymer particles (TEP), were recorded within the bloom. Bacterial stimulation, leading to nutrient remineralisation or mucus facilitating mixotrophy, is suggested to sustain bloom development. Hence, TEP production might provide an ecological advantage for the dinoflagellate, conversely causing negative effects on the environment and biological resources through hypoxia. These first insights constitute a baseline for further studies in other ecosystems impacted by this species. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect