Eutrophication, oxygen status and nutrient fluxes in a macrotidal estuarine reservoir: the case of the Ria Penfeld, Bay of Brest
| Autor: | S. P. H. Jaffrès, E. Kerebel, M. M. Le Bagousse, C. J. Lefort, C. J. Y. Morisseau, K. Rouanet, N. C. Pemartin, P. Sanlis, J. Devesa, J.-F. Maguer, M. Waeles |
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| Jazyk: | English<br />French |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | LHB Hydroscience Journal, Vol 108, Iss 1 (2022) |
| Druh dokumentu: | article |
| ISSN: | 27678490 2767-8490 |
| DOI: | 10.1080/27678490.2022.2098069 |
| Popis: | Excessive nutrient inputs are generally perceived to be responsible for the eutrophication of estuarine and coastal systems. Here, we show that the alteration of estuarine water circulation may be a very critical driver in the case of macrotidal systems. For this study, we intensively sampled the upstream part of the Ria Penfeld in June 2021, in a period of maximum irradiance and after a period of ~7 days of closure of the Kervallon dam gate. We observed that the physico-chemical structure of the Ria Penfeld reservoir (RPR), with very high biomass (chl-a values up to 120 µg L−1) and anoxic conditions in the bottom, was radically different from what is usually observed in the other estuaries of the region. The very high net primary production (~1700 mg C m−2 d−1) in the RPR was associated with an important removal of nutrients, especially phosphate, resulting in a strong nutritional imbalance (molar N:Si:P ratio of 2100:1500:1) for the water exported to the downstream estuary. |
| Databáze: | Directory of Open Access Journals |
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