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Trophodynamics in a bathyal food web (NW Mediterranean) controlled by food limitations and fishing activity

AutorMamouridis, Valeria ; Van Oevelen, Dick; Soetaert, Karline; Cartes, Joan Enric ; Fanelli, Emanuela ; Papiol, Vanesa
Fecha de publicación17-nov-2014
Citación2nd International Ocean Research Conference (2014)
ResumenWe explored the dynamics of a food web in the continental slope of the NW Mediterranean at 600-650m depth, an area historically subjected to the fishery of the red shrimp Aristeus antennatus. We considered two inputs of carbon: the organic matter from the vertical fall through the water column and from the advective transport through the slope, and four outputs (loss of carbon): the burial process in sediments, the dissipation through respiration, and the loss due to the fishing activity on target (red shrimp) and by-catch species (fish and few invertebrates). Internal components of the food web are: the organic matter in sediment, the macrobenthos, the zooplankton-micronekton and the suprabenthos, that rely directly on the organic matter in sediments and\\or external inputs, and the megafauna components (megabenthos, megaichthyofauna and the red shrimp), that prey on previous compartments. The most of the carbon flows through the macrobenthos, that play a key structural role in the community. We focused on the dynamics between red shrimp and other components to investigate the role of this species. In turn we investigated competition between predators and between species at the lowest trophic level and finally predator-prey interactions under different condition of source availability (bottom-up control) and fishing activity (top-down control). Different scenarios for inputs and outputs allowed to define the relative importance of both types of control on the food web dynamics
Descripción2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain
Versión del editorhttp://www.iocunesco-oneplanetoneocean.fnob.org/
Aparece en las colecciones: (ICM) Comunicaciones congresos
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