Spatial changes in sublittoral soft-bottom polychaete assemblages due to river inputs and sewage discharges |
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| Institution: | 1. Centre d''Estudios Avanzados de Blanes, Camino de Sta. Barbara s/n., 17300 Blanes Girona, Spain;2. Dept. Ecologia, Fac. Biologia. U. Barcelona, Avgda. Diagonal, 645, 08028 Barcelona, Spain;1. Department of Maritime Civilizations, the Leon H. Charney School for Marine Sciences, University of Haifa, Mount Carmel, Haifa 34988-38, Israel;2. The Leon Recanati Institute for Maritime Studies, University of Haifa, Mount Carmel, Haifa 34988-38, Israel;3. Israel Nature and Parks Authority, 3 Am Ve Olamo St. Jerusalem, 95463, Israel;4. School for Marine Sciences, Ruppin Academic Center, Emek-Hefer 40250, Israel;1. Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015 Palma, Spain;2. ICTS SOCIB—Sistema d''observació i predicció costaner de les Illes Balears. Parc Bit, Naorte, Bloc A 2-3, Palma, Spain;3. Institut Mediterrani d''Estudis Avançats (IMEDEA-CSIC/UIB), Miquel Marqués, 21, Esporles, 07190 Baleares, Spain;4. Instituto Español de Oceanografía, Centro Oceanográfico de Gijón, Avda. Príncipe de Asturias 70Bis, 33212 Gijón, Asturias, Spain;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. Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1680 East-West Road, Honolulu, HI 96822, USA;2. Geology & Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;3. Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, USA;4. Department of Invertebrate Zoology, National Museum of Natural History, PO Box 37012, MRC-163, Smithsonian Institution, Washington, DC 20013, USA;5. Franklin W. Olin College of Engineering, 1000 Olin Way, Needham, MA 02492, USA;6. Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA;7. School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1680 East-West Road, Honolulu, HI 96822, USA |
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| Abstract: | Spatial changes in species composition and structure of sublittoral soft-bottom polychaete assemblages along a transect parallel to the shoreline off the Barcelonès and Maresme regions on the Spanish Catalan coast (NW Mediterranean sea) are described. The transect (20 m mean depth) covers 30 km through an area affected by both water sewage discharges and river outflow. These effluents generate a spatial gradient of both silt and organic enrichment, according to the prevailing southerly currents in the zone. South of the effluents, eutrophized sediments supported a macrofaunal assemblage which was typical of polluted bottoms, characterized by the massive presence of Capitella capitata and Malacoceros fuliginosus, high abundance and biomass, low values of species richness, and a simplified trophic structure dominated by surface and subsurface-deposit feeders. North of the effluents, both the mud and organic matter content in sediment decreased drastically and the polychaete assemblages described were progressively less affected with distance. Thus, a clear change in species composition, as well as low values of abundance and biomass, increases in species richness, and a more complex trophic structure on the polychaete assemblages was observed north rather than south of the effluents. |
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