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Economic impact of human-induced shrinkage of Posidonia oceanica meadows on coastal fisheries in the Gabes Gulf (Tunisia, Southern Mediterranean Sea)

Author

Listed:
  • Radhouan El Zrelli

    (GET - Géosciences Environnement Toulouse - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - OMP - Observatoire Midi-Pyrénées - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique - Météo-France - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique)

  • Lotfi Rabaoui
  • Rubén Roa-Ureta
  • Nicola Gallai

    (ENSFEA - École Nationale Supérieure de Formation de l'Enseignement Agricole de Toulouse-Auzeville, LEREPS - Laboratoire d'Etude et de Recherche sur l'Economie, les Politiques et les Systèmes Sociaux - UT Capitole - Université Toulouse Capitole - UT - Université de Toulouse - UT2J - Université Toulouse - Jean Jaurès - UT - Université de Toulouse - Institut d'Études Politiques [IEP] - Toulouse - ENSFEA - École Nationale Supérieure de Formation de l'Enseignement Agricole de Toulouse-Auzeville)

  • Sylvie Castet

    (GET - Géosciences Environnement Toulouse - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - OMP - Observatoire Midi-Pyrénées - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique - Météo-France - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique)

  • Michel Grégoire

    (GET - Géosciences Environnement Toulouse - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - OMP - Observatoire Midi-Pyrénées - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique - Météo-France - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique)

  • Nejla Bejaoui
  • Pierre Courjault-Radé

    (GET - Géosciences Environnement Toulouse - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - OMP - Observatoire Midi-Pyrénées - IRD - Institut de Recherche pour le Développement - UT3 - Université Toulouse III - Paul Sabatier - UT - Université de Toulouse - INSU - CNRS - Institut national des sciences de l'Univers - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique - Météo-France - CNES - Centre National d'Études Spatiales [Toulouse] - CNRS - Centre National de la Recherche Scientifique)

Abstract

In early XXth century, the Gulf of Gabes (SE Tunisia) used to host the most extended Posidonia oceanica seagrass beds in the Mediterranean Sea, and a highly productive hotspot of benthic/demersal biodiversity. Sponge harvesting and seabed trawling provoked a first step of seagrass degradation. Subsequently, phosphogypsum releases from Gabes Industrial Complex, since mid-1970s, accelerated the decline of the remaining patches. A sharp reduction of coastal fisheries landings took place with the establishment of the last industrial plant units in 1985. The decrease in coastal commercial species landings was found to be directly correlated with P. oceanica decline. The trophic web system switched from a ‘benthic-dominated' to a ‘pelagic-dominated' system. The economic loss related to coastal fisheries was estimated at ~60 million € in 2014 and the 1990–2014 cumulated loss exceeded 750 million €. This first economic valuation of the only direct-use consumptive value of the coastal fishing service provided by P. oceanica in Gabes Gulf is a first step towards the assessment of the environmental cost of the negative externalities caused by the local phosphate industry. It may be used as a preliminary decision-making aid to consider alternative industrial solutions.

Suggested Citation

  • Radhouan El Zrelli & Lotfi Rabaoui & Rubén Roa-Ureta & Nicola Gallai & Sylvie Castet & Michel Grégoire & Nejla Bejaoui & Pierre Courjault-Radé, 2020. "Economic impact of human-induced shrinkage of Posidonia oceanica meadows on coastal fisheries in the Gabes Gulf (Tunisia, Southern Mediterranean Sea)," Post-Print hal-02949095, HAL.
    • Handle: RePEc:hal:journl:hal-02949095
    DOI: 10.1016/j.marpolbul.2020.111124
    Note: View the original document on HAL open archive server: https://hal.science/hal-02949095
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    References listed on IDEAS

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