Contrasting key roles of Ruppia cirrhosa in a southern Mediterranean lagoon: Reservoir for both biodiversity and harmful species and indicator of lagoon health status |
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| Institution: | 1. Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, France;2. Institut National des Sciences et Technologies de la Mer (INSTM), Laboratoire Milieu Marin, Centre la Goulette, Tunisia;1. Dipartimento di Scienze della Vita e dell?Ambiente, Università degli Studi di Cagliari, Via T. Fiorelli 1, 09126 Cagliari, Italia;2. The Arctic University of Norway, Tromsø, Norway;3. GRC Geociències Marines, Departament d’Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona, Barcelona, Spain;4. CEFREM, UMR CNRS 5110, CNRS-Univ. Perpignan, Perpignan, France;5. Stazione Zoologica Anton Dohrn, Villa Comunale I, Napoli, Italia;1. Physical Oceanography Department, CICESE, Ensenada, Baja California, Mexico;2. Coastal Processes and Physical Oceanography, CINVESTAV-IPN Merida, Yucatan, Mexico;3. Sciences Faculty, UNAM. Campus Sisal, Yucatan, Mexico;4. Civil and Coastal Engineering Department, University of Florida, Gainesville, FL, USA;1. Centre d′Estudis Avançats de Blanes (CEAB-CSIC), c/ Accés a la Cala St. Francesc, 14, E-17300 Blanes, Spain;2. Marine Biology Department, Ghent University, Krijgslaan 281 S8, B-9000 Ghent, Belgium;3. Florida State University Coastal and Marine Lab, 3618 Coastal Highway 98, St. Teresa, FL 32358-2702, USA;4. Marine Invertebrate Phylogenetics Lab Scripps Institution of Oceanography, 8750 Biological Grade, Hubbs Hall, La Jolla, CA 92037, USA |
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| Abstract: | The distribution of Ruppia cirrhosa meadow density and its epiphytic organisms in relation with environmental factors were studied in summer 2011 at five stations in the Ghar El Melh lagoon (GML; southern Mediterranean Sea). Eleven epiphytic groups were recognised among which diatoms and dinoflagellates were the dominant groups and greatest contributors to temporal dissimilarity. An overwhelming concentrations of harmful microalgae was recorded, mainly represented by the toxic dinoflagellate Prorocentrum lima with maximal concentrations attaining 6 × 105 cells 100 g?1 of Ruppia fresh weight. The epifauna community accounted for only 1.4% of total epiphyte abundance and was comprised predominantly of nematodes (47.51%), ciliates (32.59%), fish eggs (7.2%) and larvae (4.95%). PERMANOVA analyses revealed a significant spatio-temporal variation of all epiphytic groups (p < 0.01). In this study, R. cirrhosa and its epiphytes were studied as potential early warning indicators of the health status of GML waters. |
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| Keywords: | Epiphytes Enviromental factors Ghar El Melh lagoon |
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