Driving factors behind the distribution of dinocyst composition and abundance in surface sediments in a western Mediterranean coastal lagoon: Report from a high resolution mapping study

Fertouna-Bellakhal, Mouna; Dhib, Amel; Béjaoui, Béchir; Turki, Souâd; Aleya, Lotfi

doi:10.1016/j.marpolbul.2014.04.041

Cited by 41 publications

(26 citation statements)

References 68 publications

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“…and measured (✳) total fresh tissue weight (W) As mentioned in the "Results" section, the seasonal variation of chlorophyll a presents two peaks, one in spring (April) and the other in summer (August). This chlorophyll a variation is nearly similar to other studies carried out in Bizerte Lagoon (Sakka Hlaili et al 2007;Fertouna-Bellakhal et al 2014). The first peak of chlorophyll a may be explained essentially by nutrient availability inducing phytoplankton growth.…”

Section: Temperature and Chlorophyll Asupporting

confidence: 91%

“…1). The ecosystem is affected by various anthropogenic activities, including domestic sewage input, industrial waste, atmospheric pollution, farmland runoff, and bivalve aquaculture (Fertouna-Bellakhal et al 2014). The STL station supports nutrient concentrations, especially of total phosphorus, of 0.78-2.84 μM l −1 .…”

Section: Study Areamentioning

confidence: 99%

“…They therefore use their energy reserve until depletion, thus causing cell death (Anestis et al 2007). In addition, increased temperature will exacerbate the already established anoxic hypolimnion in summer (Fertouna-Bellakhal et al 2014;Zaaboub et al 2014), with the especially abundant organic matter at the STL farm being degraded by bacterial development, leading to sulfide production which, in turn, causes the waters to take on a whitish color (Chapelle 1995) and causing mass mortality in flora and fauna, including farmed mussels (Ifremer 2007).…”

Section: Heat Wave Scenariomentioning

confidence: 99%

“…It is noteworthy that mussel farming is still practiced exclusively in Bizerte Lagoon where farming methods are controlled and spat recruitment is successful (Aloui-Béjaoui 1998;Béji 2000). Nevertheless, mussel production has decreased in recent decades due to frequent mass mortality caused by harmful microalgae (Sahraoui et al 2009;Turki et al 2014) and also owing to increases in water temperature which have been shown to be associated with increased bacterial activity and overall eutrophication (Essid et al 2008;Boukef Ben Omrane et al 2010;Fertouna-Bellakhal et al 2014). On the other hand, shellfish growth has also been shown to be tolerant of a wide range of temperatures and accepting of a plethora of food sources, making them one of the most highly successful aquaculture species (Bacher et al 1991).…”

Section: Introductionmentioning

confidence: 99%

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Dynamic energy budget model: a monitoring tool for growth and reproduction performance of Mytilus galloprovincialis in Bizerte Lagoon (Southwestern Mediterranean Sea)

Béjaoui-Omri

Béjaoui

Harzallah

et al. 2014

Environ Sci Pollut Res

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Mussel farming is the main economic activity in Bizerte Lagoon, with a production that fluctuates depending on environmental factors. In the present study, we apply a bioenergetic growth model to the mussel Mytilus galloprovincialis, based on dynamic energy budget (DEB) theory which describes energy flux variation through the different compartments of the mussel body. Thus, the present model simulates both mussel growth and sexual cycle steps according to food availability and water temperature and also the effect of climate change on mussel behavior and reproduction. The results point to good concordance between simulations and growth parameters (metric length and weight) for mussels in the lagoon. A heat wave scenario was also simulated using the DEB model, which highlighted mussel mortality periods during a period of high temperature.

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Section: Temperature and Chlorophyll Asupporting

confidence: 91%

Section: Study Areamentioning

confidence: 99%

Section: Heat Wave Scenariomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic energy budget model: a monitoring tool for growth and reproduction performance of Mytilus galloprovincialis in Bizerte Lagoon (Southwestern Mediterranean Sea)

Béjaoui-Omri

Béjaoui

Harzallah

et al. 2014

Environ Sci Pollut Res

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“…This could help to detect a potential future introduction of a non-indigenous harmful dinoflagellate species in this ecosystem through human-assisted dispersal. Along the southern Mediterranean shores, few studies were conducted on dinoflagellate cyst distribution (Zmerli Triki et al, 2014, 2015bFertouna-Bellakhal et al, 2014). We considered Speniferites species as a single speniferites group morphotype so as to avoid potential mis-identification and, in addition, unidentifiable dinoflagellate cysts were not counted.…”

Section: Dinocyst Abundance and Diversitymentioning

confidence: 99%

Do the levels of industrial pollutants influence the distribution and abundance of dinoflagellate cysts in the recently-deposited sediment of a Mediterranean coastal ecosystem?

Triki

Laabir

Lafabrie

et al. 2017

Science of The Total Environment

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We studied the relationships between sediment industrial pollutants concentrations, sediment characteristics and the dinoflagellate cyst abundance within a coastal lagoon by investigating a total of 55 sampling stations within the Bizerte lagoon, a highly anthropized Mediterranean ecosystem. The sediment of Bizerte lagoon is characterized by a high dinocyst abundance, reaching a maximum value of 2742 cysts·g −1 of dry sediment. The investigated cyst diversity was characterized by the presence of 22 dominant dinocyst morphotypes belonging to 11 genera. Two dinoflagellate species dominated the assemblage: Alexandrium pseudogonyaulax and Protoperidinium claudicans, representing 29 to 89% and 5 to 38% of the total cyst abundance, respectively, depending on the station. Seven morphotypes belonging to potentially toxic species were detected, including Alexandrium minutum, A. pseudogonyaulax, Alexandrium catenella/tamarense species complex, Lingulodinium polyedrum, Gonyaulax cf. spinifera complex, Prorocentrum micans and Protoceratium reticulatum. Pearson correlation values showed a positive correlation (α = 0.05) between cyst abundance and both water content and fine silt sediment content. Clustering revealed that the highest abundance of cysts corresponds to stations presenting the higher amounts of heavy metals. The simultaneous autoregressive model (SAM) highlighted a significant Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v correlation (α = 0.05) between cyst accumulation and two main factors: sediment water content and sediment content for several heavy metals, including Hg, Cd, Cu, Ni and Cr. These results suggest that the degree of heavy metal pollution could influence cyst accumulation patterns.

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Distribution and assessment of heavy metal toxicity in sediment cores from Bizerte Lagoon, Tunisia

Mna

Oueslati

Helali

et al. 2017

Environ Monit Assess

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To examine the state of pollution of Bizerte Lagoon which is exposed to intense anthropogenic pressure, two sediment cores were taken at two sites, one undergoes the dual effects of both marine waters arriving from the Mediterranean Sea through the Channel, and also of freshwater from the Tinja River; the other core is located at the center of the lagoon where water depth is maximal (12 m). Heavy metal concentrations in the two cores were assessed, with calculated enrichment factors and geo-accumulation indexes. Core sediments were also studied for chemical speciation and their monosulfide contents were measured. Results from enrichment factors and geo-accumulation indexes show an accumulation of Cd, Zn, Cr, and Pb, while chemical speciation revealed a risk only from Cd and Mn. Comparison of sequential extraction values with those of acid volatile sulfides revealed that non-toxic effects may be caused by any of the studied metals in the sediment.

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Driving factors behind the distribution of dinocyst composition and abundance in surface sediments in a western Mediterranean coastal lagoon: Report from a high resolution mapping study

Cited by 41 publications

References 68 publications

Dynamic energy budget model: a monitoring tool for growth and reproduction performance of Mytilus galloprovincialis in Bizerte Lagoon (Southwestern Mediterranean Sea)

Dynamic energy budget model: a monitoring tool for growth and reproduction performance of Mytilus galloprovincialis in Bizerte Lagoon (Southwestern Mediterranean Sea)

Do the levels of industrial pollutants influence the distribution and abundance of dinoflagellate cysts in the recently-deposited sediment of a Mediterranean coastal ecosystem?

Distribution and assessment of heavy metal toxicity in sediment cores from Bizerte Lagoon, Tunisia

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