Recovery of eutrophized marine ecosystems using the European flat oyster, Ostrea edulis

The development of tourism and intensification of agriculture has released large amounts of nitrogen and phosphorus into the Mar Menor coastal lagoon in South-east Spain, resulting in a phytoplankton bloom in 2016. This bloom turned the clear and transparent waters turbid and greenish, and killed approximately 85% of benthic macrophytes.Nutrient bioextraction by flat oysters, Ostrea edulis, has been proposed for remediation of these eutrophication events and water quality recovery.This research aims to quantify the clearance rate and investigate the genetic origin of Mar Menor oysters under eutrophized conditions for potential applications to bioremediation projects. Oligotrophic and eutrophic conditions were replicated in the laboratory, and oyster feeding behaviour (i.e. clearance rates, ingestion rates, absorption efficiency and absorption rates) were studied using a flow-through system.The genetic characterization of oysters showed no significant difference between individuals from the Mar Menor and individuals collected from a nearby Mediterranean bed (Tabarca Island).Based on the physiological results observed, oysters were grouped into high-feeder (HF) and low-feeder (LF) categories according to their clearance rate, that was 3-fold higher in the HF group. Different responses in feeding behaviour were observed under eutrophic conditions in both oyster groups. Constraints in the absorption capacity of LF oysters seemed to be related to their reduced filtering activity. Lower body condition of LF oysters was evidenced by their negative scope for growth value.From this work, several conclusions can be drawn for future restoration/bioextraction actions: (i) the recovery of half of the oyster population that existed in the past would act as an effective top-down control on the phytoplankton community; (ii) using clearance rate measurements is recommended to select oysters as broodstock; and (iii) Mediterranean oysters could be used as broodstock in the event that Mar Menor oysters fail to reproduce.

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Tipo de recurso Texto
Fecha de creación 16-07-2024
Fecha de última modificación 16-07-2024
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Identificador de los metadatos 821642c8-3880-565e-958f-c4d1c42e9da1
Idioma de los metadatos Español
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Categoría temática ISO 19115 biota
Identificador alternativo DOI 10.1002/aqc.3926
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Identificador INSPIRE ESPMITECOIEPNBMMENOR842
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Identificador geográfico Murcia
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"{\"type\": \"Polygon\", \"coordinates\": [[[-2.34, 37.38], [-0.69, 37.38], [-0.69, 38.76], [-2.34, 38.76], [-2.34, 37.38]]]}"
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  1. Aquatic conservation: Marine and Freshwater Ecosystems. Native Oyster Retoration Alliance (NORA) 4TH Conference ‐ Reconnecting Across Europe
  2. vol 33
  3. no7
  4. 645-660
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Nombre del autor Albentosa, M., Akinyemi, M.I., Vera, M., Ibarrola, I., Filgueira, R., Galimany, E., da Costa, F., Pardo, B.G., Vazquez-Luis, M., Hernandez, A., Hernandis, S. y Martinez, P.
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