MERAMOD - predicting the deposition and benthic impact of aquaculture in the Eastern Mediterranean

Cromey, C. J., Thetmeyer, Helmut, Lampadariou, N., Black, K. D., Kögeler, J. and Karakassis, I. (2012) MERAMOD - predicting the deposition and benthic impact of aquaculture in the Eastern Mediterranean Aquaculture Environment Interactions, 2 (2). pp. 157-176. DOI 10.3354/aei00034.

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A model, composed of coupled particle tracking and benthic response modules, for predicting waste solids flux and benthic impacts of gilthead sea bream (Sparus aurata L.) and sea bass (Dicentrarchus labrax L.) aquaculture, was tested at six sites with different hydrodynamics, bathymetries and biomasses in the Aegean and Ionian Seas, Eastern Mediterranean with observations of sediment trap flux and benthic impact indicators. Seven sediment trap validation studies were conducted that varied in design with traps deployed either on the sea bed, attached to nets or in the water column. Model predictions of flux to traps spaced 5 m apart up to 50 m from the cages over a 13 d period were statistically significant (r2 = 0.61, n = 57, p ≤ 0.05). However, the model could not predict adequately the flux to traps spaced 2 m apart in the high-flux zone underneath cages where variability between trap observations was high. In this high-flux zone underneath cages, the averaged model flux predictions resulted in a performance of ± 49%. Statistically significant relationships were established at four sites; between modelled flux and either benthic fauna impact indicator species (S), abundance (A), A/S ratio, Shannon Wiener Index or Biomass Fractionation Index (BFI), (r2 = 0.82, 0.60, 0.57, 0.67 and 0.48, respectively; n = 24, p ≤ 0.05). Two other sites, which did not exhibit an abundance peak in enriched zones, did not fit these relationships. Using relative abundance of taxonomic groups, a modelled flux of 4.1 g m-2 d-1 was a useful boundary; on either side of this boundary, clear trends occurred in pollutant tolerant and intolerant species.

Document Type: Article
Additional Information: WOS:000302066300005
Keywords: Aquaculture; MERAMOD; Eastern Mediterranean; gilthead sea bream (Sparus aurata L.); sea bass (Dicentrarchus labrax L.); CAGE FISH FARMS; WILD FISH; ORGANIC ENRICHMENT; SHELLFISH AQUACULTURE; TEMPORAL VARIABILITY; MARINE-SEDIMENTS; STABLE-ISOTOPE; SALMON; MATTER; WASTE
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
DOI etc.: 10.3354/aei00034
ISSN: 1869-215X
Projects: MERAMED
Date Deposited: 16 Dec 2011 08:17
Last Modified: 06 Sep 2016 08:25

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