The present environmental scenario of the Nador Lagoon (Morocco)

Muñoz, Francisco Ruíz; Abad, Manuel; Álvarez, Manuel Olías; Galán, E.; González, I.; Aguila, E; Hamoumi, Naima; Pulido, I. Carrillo; Cantano, M.

doi:10.1016/j.envres.2006.03.001

Cited by 103 publications

(44 citation statements)

References 30 publications

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“…The spatial variation in sediment contaminant content seems to be driven also by variation in grain size distribution, which in the Stagnone follows a concentric pattern, with silt and clay more concentrated in the Centre of the basin (Vizzini 2000). As an example, in South, As content showed averaged values lower than the ranges reported for other Mediterranean lagoons (e.g., Nador lagoon-Morocco, Ruiz et al 2006), whereas in Centre, values were similar to those for contaminated lagoons (e.g., central part of Venice lagoon-Italy, Bellucci et al 2002). Moreover, As, Cd, and THg showed values approaching or exceeding the Italian regulatory limits (Gazzetta Ufficiale della Repubblica Italiana D.M.…”

Section: Trace Elementsmentioning

confidence: 72%

Trophic Transfer of Trace Elements in an Isotopically Constructed Food Chain From a Semi-enclosed Marine Coastal Area (Stagnone di Marsala, Sicily, Mediterranean)

Vizzini

Costa

Tramati

et al. 2013

Arch Environ Contam Toxicol

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Trace element accumulation is particularly important in coastal and transitional environments, which act as contaminant buffers between the continental and marine systems. We compared trace element transfer to the biota in two locations with different open-sea exposures in a semi-enclosed marine coastal area (Stagnone di Marsala, Sicily, Italy) using isotopically reconstructed food chains. Samples of sediment, macroalgae, seagrasses, invertebrates, fish, and bird feathers were sampled in July 2006 and analysed for stable carbon and nitrogen isotopes (d 13 [Pb]). Trophic magnification factors were calculated through the relationships between trace elements and d 15 N in consumers. As and Pb were greater in organic matter sources (sediments and primary producers), whereas Cd and THg were greater in bird feathers. At the food chain level, an insignificant trophic transfer was found for all elements, suggesting biodilution rather than biomagnification. Sediments were more contaminated in the location with lower open-sea exposure. Macroalgae and seagrasses overall mirrored the spatial pattern highlighted in sediments, whereas differences between the two locations became further decreased moving toward higher trophic levels, indicating that trophic transfer of sediment and macrophyte-bound trace elements to the coastal lagoon food chain may be of relatively minor importance.

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Section: Trace Elementsmentioning

confidence: 72%

Trophic Transfer of Trace Elements in an Isotopically Constructed Food Chain From a Semi-enclosed Marine Coastal Area (Stagnone di Marsala, Sicily, Mediterranean)

Vizzini

Costa

Tramati

et al. 2013

Arch Environ Contam Toxicol

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“…This implies a lack or depletion of meiofauna (Bodergat et al 2002;Ruiz et al 2006) because only a few ostracod species can adapt to such conditions (Ruiz et al 2005).…”

Section: Discussionmentioning

confidence: 99%

Meiofauna, trace metals, TOC, sedimentology, and oxygen availability in the Late Miocene sublittoral deposits of Lake Pannon

Stárek

Pıpík

Hagarová³

2009

Facies

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The Late Miocene fine-grained deposits have been investigated in the Vienna Basin to attest oxygen availability for infauna and epifauna in the sublittoral of the long-lived Lake Pannon. A clay and fine silt of the deeper lacustrine facies of a bay passed vertically into a silty clay, silt, and fine sand rhythmic deposition reflecting successive progradation of brackish prodelta to distal delta front colonized by a dense benthic population. A fully oxygenated environment is supposed in the Congeria subglobosa Beds and prodelta accentuated by ichnofauna, ostracods, and abundant in taxa and specimens, low total organic content, and trace elements concentration. A limited anoxic event caused by temporarily worsened circulation has been detected in non-calcareous greyish-blue homogenous clay with a noticeable high concentration of Ni, Co, and Pb coupled with absence of fossils, bioturbation, and low total organic carbon content.

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“…• The marine waters passing through the artifi cial inlet, which are always dominant; • The hydrogeological contributions from two aquifersGareb, located in southern Selouane, and Bou Areg, situated near the southern margin of the lagoon; and • The surface water inputs, with periodic fl ows of 10 small streams (''oueds'') (Ruiz et al 2006). In the lagoon, these individual infl ows are managed by internal currents, which have a clockwise direction from the artifi cial inlet toward the NW coast, moving about the internal face of the sandy spit and the internal lagoon margin (Guelorget et al 1987).…”

Section: Methodsmentioning

confidence: 99%

Fish assemblages of a shallow Mediterranean lagoon (Nador, Morocco): An analysis based on species and functional guilds

Jaafour¹

2015

Acta Ichthyol. Piscat.

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R. 2015. Fish assemblages of a shallow Mediterranean lagoon (Nador, Morocco): An analysis based on species and functional guilds. Acta Ichthyol. Piscat. 45 (2): 115-124.Background. Due to their location between the continent and the sea and their shallow depths, lagoons play an important ecological role in coastal ecosystems by providing a selection of habitat types for many species, functioning as nursery areas and feeding grounds for marine opportunistic fi shes. The fi sh fauna of the Nador Lagoon (NE Morocco), as in the majority of southern Mediterranean lagoons, has been insuffi ciently studied, even though the lagoon itself supports important commercial fi sheries. The presently reported study investigated the spatial and seasonal uses of shallow habitats for fi sh fauna in the Nador Lagoon. Materials and methods. Sampling was done using a beach seine net at six stations covering almost entire lagoon and representing habitats differing in many parameters such as the distance from the inlet, bottom sediment characteristics, presence of macroalgae, etc. The fi sh abundance was standardized as catch per unit effort (CPUE) and the fi sh community was analysed both in terms of its taxonomic and functional composition (by making use of both ecological and dietary preference guilds). Results. A total of 2872 individuals, representing 15 species from 12 families, was collected during the four seasons. Only six species were always present in all seasons. Fish abundance peaked in spring and the species diversity was higher in spring and summer. The fi sh assemblage was largely dominated in terms of ecological guild by the resident and benthivorous species. Spatial and seasonal fi sh assemblages differed both in terms of fi sh abundance and diversity and also in terms of functional guilds composition. In autumn, the fi sh assemblage was dominated by the marine juvenile migrants whereas in winter, spring, and summer, resident species were the most abundant. Conclusion. The combination of taxonomic and functional characteristics of the fi sh assemblages, determined in the presently reported study, may contribute to a better understanding of the ecological networks of the Nador Lagoon, thus providing useful data for its conservation and management. Keywords: fi sh, spatio-temporal assemblages, beach seine, lagoon, Nador, Morocco Jaafour et al. 116 or even restoring certain Mediterranean lagoons are being discussed. Hence, there is a need for more information on the role and functioning of coastal lagoons in terms of fi sh requirements.The Nador Lagoon, also known as the "Sebkha Bou-Areg" or "Mar Chica" (the small sea), is the second largest lagoon complex in northern Africa (115 km 2 ) and the broadest paralic environment of Morocco. Its importance consists not only in its ecological value (RAMSAR site) but also in its socio-economic role. The fi sh fauna of the Nador Lagoon is not well known (Bouchereau et al. 2000), although the lagoon itself maintains a diverse fi sh community and supports important commercial ...

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The present environmental scenario of the Nador Lagoon (Morocco)

Cited by 103 publications

References 30 publications

Trophic Transfer of Trace Elements in an Isotopically Constructed Food Chain From a Semi-enclosed Marine Coastal Area (Stagnone di Marsala, Sicily, Mediterranean)

Trophic Transfer of Trace Elements in an Isotopically Constructed Food Chain From a Semi-enclosed Marine Coastal Area (Stagnone di Marsala, Sicily, Mediterranean)

Meiofauna, trace metals, TOC, sedimentology, and oxygen availability in the Late Miocene sublittoral deposits of Lake Pannon

Fish assemblages of a shallow Mediterranean lagoon (Nador, Morocco): An analysis based on species and functional guilds

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