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Céline LAFABRIE Olivier PRINGAULT Asma SAKKA HLAILI Christophe LEBOULANGER Rutger DE WIT Anthropization of Mediterranean lagoon ecosystems: impact of chemical.

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Presentation on theme: "Céline LAFABRIE Olivier PRINGAULT Asma SAKKA HLAILI Christophe LEBOULANGER Rutger DE WIT Anthropization of Mediterranean lagoon ecosystems: impact of chemical."— Presentation transcript:

1 Céline LAFABRIE Olivier PRINGAULT Asma SAKKA HLAILI Christophe LEBOULANGER Rutger DE WIT Anthropization of Mediterranean lagoon ecosystems: impact of chemical contamination on the functioning and diversity of first pelagic trophic levels Final Workshop of the START/MaghLAG Project Bizerte (Tunisia) June 2012

2 oods and services  Goods and services - High productivity - Nursery and feeding zones - Biodiversity hotspots, etc. Coastal lagoons High anthropic pressures  High anthropic pressures Urbanization Agriculture Industries  Threatened/endangered ecosystems 2 © OzCoasts (Geoscience Australia) 2012

3  High importance in geochemical cycles  Fundamental roles in ecosystems functioning (O 2 production, organic matter transfer…)  Sensibility to xenobiotics  Base of food webs → Control of upper trophic levels (“bottom-up” regulation) Phytoplankton 3 Photosynthetic pelagic organisms ↓ Play a major part in lagoon ecosystems

4  To determine effects of resuspended contaminated sediment on phytoplankton diversity and functioning  To evaluate the selection pressure that chemical contamination may exert on phytoplankton communities 4  Impact of chemical contamination on natural phytoplankton communities

5  Interesting site to evaluate phytoplancton sensibility to contaminants COMETE, 2005 High chemical contamination pressures Menzel Abderahman Bizerte Menzel Bourguiba Urban areas and main chemical releases N 1 km Size = 11 x 13 km Area = ha Mean depth = 8 m Max. depth = 12 m Bizerte lagoon Mediterranean Sea Tunisia Study sites CS LM 5

6  Primary production  Growth  Specific diversity  Physiological activities Experimental protocol In situ experiments Laboratory analyses 2 x 5-days investigations Contaminated sediment elutriate (prepared from site CS sediment and water) Phytoplancton exposition Phytoplancton (from site L and site M) 6  Comparisons of « control microcosms » with « contaminated microcosms »

7 First results 7 Nutrients seem to strongly influence responses of phytoplankton exposed to contaminated sediment elutriate, stimulating growth and counterbalancing the possible harmful effects of contaminants Net productionRespiration

8 UMR 5119 ECOSYM « Écologie des systèmes marins côtiers » (Montpellier) - M. Troussellier et M. Bouvy Réseaux Plancton (RESEAUX) Populations planctoniques (DROP) Algues toxiques (ETDA) Benthos / Pelagos (BIP) PHYTOPLANKTON COLLABORATION JEAI ECOBIZ ( ) Ecology of south-mediterranean coastal lagoons Impact of anthropization on the diversity and functioning of first pelagic trophic levels in the Bizerte lagoon Resp.: M.N. Daly Yahia (FSB); Cor. AIRD: O. Pringault (IRD, ECOSYM) FSB (Faculté des Sciences de Bizerte, Tunisie) Project insertion 8

9 Tunisie France Espagne Italie Algérie Maroc LibyeEgypte Turquie Grèce Chypre Slovénie Croatie Boznie-Herz. Monténégro Albanie Malte Syrie Liban Israël Territoires palestiniens  North-South comparisons of coastal lagoons within the Mediterranean basin Perspectives 9

10 10  Réseau d’Etude des Ecosystèmes des Eaux de Transition  Founded in 2006  Ambition to network people working in France (including overseas) on coastal ecosystems, coastal lagoons, coral reef lagoons, estuaries => “Transitional Waters”  Web-site: Major activities so far  Budgets LOICZ (Land-Ocean Interactions in the Coastal Zone) working group continues to collaborate with lagoon managers  Organization of the 4 th European Conference on Coastal Lagoon Research (=> EuroLag: European Coastal lagoon symposium) REEET - France

11 December 2009, in Montpellier 319 participants from 21 countries 3 special issues being prepared: Hydrobiologia, Estuarine Coastal and Shelf Science, and Transitional Waters Bulletin

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14 14 20 June - Hydrobiologia SI, 7 out of 9 published on-line 20 June – SI ECSS 15 out of 16 published on-line

15 شكرا Thanks


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