Organic matter quantity and quality, metals availability and foraminiferal assemblages as environmental proxy applied to the Bizerte Lagoon (Tunisia)

Autor: Noureddine Zaaboub, Monia El Bour, Leandro Nogueira, Egberto Pereira, Maria Virgínia Alves Martins, Paulo Miranda, Fabrizio Frontalini, Helena Antunes Portela, Mohamed Amine Helali, Iara Clemente, Imen Boukef-BenOmrane, Darlly Reis, Lotfi Aleya
Přispěvatelé: Universidade de Aveiro, Universidade do Estado do Rio de Janeiro [Rio de Janeiro] (UERJ), Faculté des Sciences Mathématiques, Physiques et Naturelles de Tunis (FST), Université de Tunis El Manar (UTM), Institut National des Sciences et Technologies de la Mer [Salammbô] (INSTM), Università degli Studi di Urbino 'Carlo Bo', Universidade do Estado do Rio de Janeiro - Faculdade de Geologia, Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Universidade do Estado do Rio de Janeiro - UERJ, Faculté des Sciences de Tunis, Institut National des Sciences et Technologies de la Mer [Salammbô], Laboratoire Chrono-environnement ( LCE ), Université Bourgogne Franche-Comté ( UBFC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC )
Rok vydání: 2016
Předmět:
Chlorophyll
0106 biological sciences
Mediterranean climate
Geologic Sediments
Chlorophyll a
Tunisia
Foraminifera
Environment
Sulfides
010501 environmental sciences
Aquatic Science
Oceanography
01 natural sciences
[ SDE ] Environmental Sciences
Biopolymer concentrations
chemistry.chemical_compound
Acid volatile sulfides
Seawater
Organic matter
14. Life underwater
TOC
0105 earth and related environmental sciences
Trophic level
chemistry.chemical_classification
Bacteria
biology
Ecology
010604 marine biology & hydrobiology
Sediment
Simultaneously extracted metals
biology.organism_classification
Living benthic foraminifera
Oxygen isotopes
Pollution
6. Clean water
Cassidulina
chemistry
Metals
13. Climate action
Benthic zone
Environmental chemistry
[SDE]Environmental Sciences
Water Pollutants
Chemical
Environmental Monitoring
Zdroj: Marine Pollution Bulletin
Marine Pollution Bulletin, Elsevier, 2016, 19 p. ⟨10.1016/j.marpolbul.2016.02.032⟩
Marine Pollution Bulletin, Elsevier, 2016, 19 p. 〈10.1016/j.marpolbul.2016.02.032〉
ISSN: 0025-326X
DOI: 10.1016/j.marpolbul.2016.02.032
Popis: International audience; This study analyzes the benthic trophic state of Bizerte Lagoon (Tunisia) based on the total organic matter and the bioavailability of biopolymeric carbon including proteins (PTN), carbohydrates (CHO), lipids (LIP), chlorophyll a, as well as bacteria counts. The overall simultaneously extracted metals (SEM), and acid volatile sulfides (AVS) as well as the SEM/AVS ratio indicative of the toxicity of the sediments also were analyzed aiming to study their impact in the dimension, composition and structure of both dead and living benthic foraminiferal assemblages.In the studied sites TOC content is relatively high and the PTN/CHO values indicate that they can be considered as meso-eutrophic environments. The CHO/TOC and C/N values suggest that the OM which accumulated on the sediments surface has mainly natural origin despite the introduction of municipal and industrial effluents in the lagoon and the large bacterial pool.The living assemblages of benthic foraminifera of Bizerte Lagoon are quite different to other Mediterranean transitional systems studied until now. They are composed of typical lagoonal species but also include several marine and opportunistic species including significant numbers of bolivinids, buliminids, Nonionella/Nonionoides spp. and Cassidulina/Globocassidulina spp. These assemblages seem to benefitfrom the physicochemical parameters and the sediment stability. They may however face environmental stress in the lagoon related to the AVS production as a result of the organic matter degradation and toxicity in some areas due to the available concentrations of metals. Nonetheless statistical results evidence that the structure and dimension of assemblages are being controlled mostly by OM quantity and quality related mainly to the availability of PTN, CHO and chlorophyll a. Results of this work support the importance of considering OM quantity and quality in studies of environmental impact in coastal systems.
Databáze: OpenAIRE
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