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Dynamic model to calculate the carrying capacity for bivalve growth in a coastal embayment

AuthorsIbáñez Solé, J.; Ramón, Montserrat ; Fernández-Tejedor, Margarita
Issue Date28-Nov-2013
CitationIntegrating New Advances in Mediterranean Oceanography and Marine Biology. Meeting program: 34 (2013)
AbstractAlfacs Bay (NW Mediterranean Sea) has an important aquaculture activity on bivalve culture and extraction. This activity has remarkable impacts on the economy of the zone and on the ecosystem where it is developed. In this study we aimed to determine the effects of mussel cultures on seston and chlorophyll depletion in Alfacs Bay. The principal objective of this work is the development and implementation of a depletion model, which would explain the changes on seston concentrations through the year and the application of the Dynamic Energy Budget model (DEB model) and the Scope For Growth model (SFG model). The models were expected to be suitable for Alfacs Bay but with the new parameterization of the half-saturation coefficient, which has to take into consideration the wide range of temperatures occurring in this embayment along the year. The results of this work show that the depletion inside Alfacs Bay has an important dimension and has to be considered among the terms to determine the carrying capacity of this embayment. The depletion model shows that the most important depletion rates take place between April and December, when the mussel activity is most important and when the irrigation channels from the rice paddies bring water inside the bay, providing nutrient-rich water. The application of the DEB model in this first approximation indicates that the DEB model is a good tool and that it can be applied in Alfacs bay. We took into consideration the differences between this Mediterranean ecosystem and the Atlantic ecosystems where it has been applied before, like the wide range of temperatures and the low depths in Alfacs Bay. The parameterization of the half-saturation coefficient for Alfacs Bay has shown that it cannot be determined with a constant value valid for the whole year but it has to be determined for the different seasons due to the temperature differences. In this work a value for the half-saturation coefficient in the different seasons has been estimated and used to apply the DEB model, with satisfying results. The application of the SFG model in this first approximation shows that the results obtained by the SFG model are not in agreement with the observations in the environmental conditions of Mediterranean areas like Alfacs Bay, with a wide range of temperatures. The reason is that the SFG model does not present a correct dependence between ingestion and temperature, because they are only related by an exponential factor
DescriptionSymposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain
Publisher version (URL)http://www.icm.csic.es/bio/medocean/information.htm#schedule
Appears in Collections:(ICM) Comunicaciones congresos
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