2024-03-28T23:32:52Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/983162020-05-25T07:46:16Zcom_10261_47com_10261_8col_10261_300
2014-06-13T07:54:25Z
urn:hdl:10261/98316
Biodeposit contribution to natural sedimentation in a suspended Mytilus galloprovincialis Lmk mussel farm in a Galician Ría (NW Iberian Peninsula)
Zúñiga, Diana
Castro, Carmen G.
Aguiar, Eva
Labarta, Uxío
Figueiras, F. G.
Fernández-Reiriz, María José
Mussel
Galician Rías
Biodeposition
Organic carbon
Feces
Sedimentation
20 páginas, 7 figuras, 4 tablas
This work aimed to study how mussel culture of Mytilus galloprovincialis Lmk modulates the natural sedimentation rates through the water column as key controlling factor of the potential organic load reaching the bottom sediments. To achieve this objective, seston, feces production and natural sedimentation dynamics were characterized during 4 seasonal campaigns at two mussel rafts and at a reference station not affected by the mussel culture in the Ría de Ares–Betanzos (NW Iberian Peninsula).
Our results showed that seston content are below the pseudofeces threshold (< 4 mg L− 1) with inorganic contents ranging between maximum values of 76 ± 4% in winter and minimum values of 6 ± 4% in spring. These seasonal variations controlled the feces (biodeposits) production by mussels (11–221 mg ind− 1 d− 1) that increased with seston content, in particular under winter stormy conditions, when intense continental runoff and resuspension processes represented an important source of non-digestive inorganic particles for mussels.
Natural sedimentation fluxes recorded by means of sediment traps under the rafts (84–536 g m− 2 d− 1) seasonally varied with mussel biodeposition being 6–7 folds the rates at the reference site. This fact corroborates that mussel feeding activity throughout the production of feces increased natural sedimentation rates in the Ría de Ares–Betanzos. However, the relatively energetic water column conditions and the potentially high degradation rates of feces in the culture area reduced up to 55–90% the biodeposits' organic carbon potentially arriving at the seafloor. This indicates that in highly hydrodynamic environments the impact derived from shellfish culture may be reduced, attenuating a possible impact on the benthic communities
2014-06-13T07:54:25Z
2014-06-13T07:54:25Z
2014
artículo
Aquaculture 432: 311-320 (2014)
0044-8486
http://hdl.handle.net/10261/98316
10.1016/j.aquaculture.2014.05.026
eng
Postprint
http://dx.doi.org/10.1016/j.aquaculture.2014.05.026
Sí
openAccess
Elsevier