Trophic food web and ecosystem attributes of a water reservoir of the Ria Formosa (south Portugal) |
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| Institution: | 1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Institute for the Oceans and Fisheries, The University of British Columbia, Vancouver V6T 1Z4, Canada;4. Fisheries College, Ocean University of China, Qingdao 266003, PR China;1. Institut de Ciències del Mar (ICM-CSIC), Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain;2. Kinneret Limnological Laboratory, Israel Oceanographic & Limnological Research. P.O. Box 447, Migdal, 14950, Israel;3. Ecopath International Initiative Research Association, Barcelona, Spain;4. Institut de Recherche pour le Développement, UMR EME 212. Centre de Reserche Halieutique Méditerranéenne et tropicale. Avenue Jean Monnet, BP 171, 34203 Sète Cedex, France;6. Instituto Español de Oceanografía (IEO). Centro Oceanográfico de Murcia, Murcia, Spain;7. School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, Scotland, UK;1. Catalan Institute for Water Research (ICRA), Girona, Spain;2. Department of Evolutionary Biology, Ecology and Environmental Sciences, Universitat de Barcelona, Barcelona, Spain;3. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720-3114, USA;4. Institute of Aquatic Ecology, University of Girona, Girona, Spain |
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| Abstract: | Using a top-down modelling approach, a balanced trophic food web model of a water reservoir of the Ria Formosa lagoonal system was constructed. Few adjustments of input data were necessary to run the model since most of the parameters were estimated at the study site and the characteristics of the water reservoir allowed a high degree of control and precision in terms of sampling and data collection. Trophic levels of the 14 compartments included in the model varied between 1.0 for primary producers and detritus to 3.4 for carnivorous fish and the 14 groups were aggregated in a food chain with six trophic levels. The water reservoir has a detritus based food chain, with the majority of the biomass concentrated in the first two levels, the producers level and the herbivore/detritivore level (97.6%). The transfer efficiencies were low, and decreased with increasing level number, varying between 6.0 and 0.2%. The degree of “ecosystem maturity” was difficult to establish, but several parameters indicate that it could be high. The water reservoir studied, which has similar environmental and ecological characteristics as the Ria Formosa lagoon, is near its carrying capacity. |
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