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Oceanographic and bathymetric features as the target for pelagic MPA design: A case study on the Cape of Gata
Muñoz, M.; Reul, A.; García-Martínez, M.d.C.; Plaza, F.; Bautista, B.; Moya, F.; Vargas-Yánez, M. (2018). Oceanographic and bathymetric features as the target for pelagic MPA design: A case study on the Cape of Gata. Water 10(10): 1403. https://dx.doi.org/10.3390/w10101403
In: Water. MDPI: Basel. ISSN 2073-4441; e-ISSN 2073-4441, meer
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| Author keywords |
seamount; fronts; fertilization; coastal water effluents; vertical connection; marine protected area; coastal management |
| Auteurs | | Top |
- Muñoz, M.
- Reul, A.
- García-Martínez, M.d.C.
- Plaza, F.
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- Bautista, B.
- Moya, F.
- Vargas-Yánez, M.
|
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| Abstract |
The Cape of Gata region (southeast Spain) allocates the thermo-haline Almeria–Oran front (AOF), which separates two biogeographical zones, with a very irregular bathymetry, consisting of two canyons and seamounts in an area of 100 × 100 km. An interdisciplinary oceanographic sampling strategy allowed us to solve mesoscale processes including current–bathymetry interactions. Subsurface fertilizing processes and elevated chlorophyll a concentrations were found at the front, seamount, and submarine canyons, turning an apparently oligotrophic area into a rich one. According to a horizontal tracking simulation, the deep chlorophyll maximum (DCM) at the front is located above the pycnocline and travels fast offshore, transporting productivity from the fertilization process quickly from the region. The DCM at the seamount, in contrast, develops below the pycnocline and remains for almost three weeks in this area. In spite of the coastal marine protected areas (MPAs), a high surface nitrate concentration plume with its origin in a small coastal area without any protection was detected. Local circulation patterns and bathymetry–current interactions provide elevated productivity in surface water which is vertically connected to deep-sea fauna via the daily vertical migration of zooplankton, suggesting elevated biodiversity on the seamount and canyons of the area studied. Based on these results, and considering the presence of coastal MPAs and a Coastal Area Management Program, future studies on benthic fauna, an enlargement of coastal MPAs, and a transboundary land–deep-sea management program are suggested. |
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