Large-scale impacts of bottom trawling on shelf primary productivity |
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| Authors: | Costas Dounas Ian Davies George Triantafyllou Panayota Koulouri George Petihakis Christos Arvanitidis George Sourlatzis Anastasios Eleftheriou |
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| Institution: | 1. Institute of Marine Biology and Genetics, Hellenic Centre for Marine Research, Gournes Pediados, P.O. Box 2214, 71003 Heraklion, Crete, Greece;2. Fisheries Research Services, Marine Laboratory, P.O. Box 101, Victoria Road, Torry, Aberdeen AB11 9DB, UK;3. Institute of Oceanography, Hellenic Centre for Marine Research, P.O. Box 712, 19013 Anavissos, Attika, Greece;4. Department of Biology, University of Crete, Voutes, P.O. Box 2208, 71409 Heraklion, Crete, Greece |
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| Abstract: | Disturbance of the seabed resulting from bottom trawling affects ecosystem processes, such as the rate and magnitude of nutrient regeneration. The potential responses of the plankton community arising from such effects can be modelled, provided that reliable data on the effects on nutrient fluxes are available. In a north Cretan outer continental shelf and upper slope fishing ground (Heraklion Bay, Crete, Eastern Mediterranean) we applied a new field instrument which can simulate the passage of trawl groundropes across the sea floor and made direct seasonal measurements of the rate of dissolved and particulate nutrient releases resulting from seabed disturbance. These observational data were then integrated in a 3D ecosystem model. Results revealed that bottom trawling may trigger off considerable productivity pulses, in addition to pulses from the natural seasonal cycle. |
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| Keywords: | Bottom trawling Ecosystem disturbance Nutrient releases Nutrient recycling Resuspension Primary production Modelling |
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