Pseudo-nitzschia spp. (Bacillariophyceae) and dissolved organic matter (DOM) dynamics in the Ebro Delta (Alfacs Bay, NW Mediterranean Sea)

Loureiro, Sofia; Garcés, Esther; Fernández-Tejedor, Margarita; Vaqué, Dolors; Camp, Jordi

doi:10.1016/j.ecss.2009.04.029

Cited by 36 publications

(33 citation statements)

References 65 publications

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“…Our results will be useful to relate the seiche dynamics with the role of the nutrients and the biochemical processes observed in the Bay (Loureiro et al, 2009;Llebot et al, 2011). Furthermore, new questions arise from our investigations.…”

Section: Accepted M Manuscriptmentioning

confidence: 98%

“…Cerralbo et al (2014) studied the tidal characteristics of the bay noticing the importance of the 3-h seiches, enhancing their importance and describing the 1-h seiches (corresponding to the 1st seiching mode). On the other hand, several ecological studies noticed the presence of harmful algal blooms (HABs) in some periods and their relation with nutrients and waters from the open sea (Loureiro et al 2009). …”

Section: --Alfacs Baymentioning

confidence: 99%

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Hydrodynamic response in a microtidal and shallow bay under energetic wind and seiche episodes

Cerralbo

Grifoll

Espino

2015

Journal of Marine Systems

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In this contribution we investigate the hydrodynamic response in a micro-tidal and shallow semienclosed domain. We chose a set of observations which include currents, hydrography and meteorological data obtained in Alfacs Bay (NW Mediterranean Sea). Short-term response to energetic winds events was found in the hydrography and water velocity observations, sometimes inverting the estuarine circulation or developing one-layered flow. In comparison to previous investigations in Alfacs Bay, we observed that water current variability, and also maximum velocities, were directly related to the development of surface standing waves (i.e. seiches). Mixing mechanisms versus buoyancy sources are studied through potential energy anomaly equation, proving the leading freshwater contribution to stratification, enhanced by heat fluxes in summer. On the other hand, mixing is directly related to winds, mainly in winter and early spring when both buoyancy forces are lower. We also study turbulent bottom mixing by seiches through observations, dimensionless relations and numerical modelling. Seiche induced mixing is suggested as an eventual mechanism that may break the stratification within the Bay under special circumstances.

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Section: Accepted M Manuscriptmentioning

confidence: 98%

Section: --Alfacs Baymentioning

confidence: 99%

Hydrodynamic response in a microtidal and shallow bay under energetic wind and seiche episodes

Cerralbo

Grifoll

Espino

2015

Journal of Marine Systems

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“…See Table 5 for a summary of species-specificity for growth under different nitrogenous nutrients. Enrichment experiments conducted with natural assemblages from the Mediterranean Sea (Loureiro et al, 2009a) and cultures of P. delicatissima (Loureiro et al, 2009b), isolated from coastal Spain, showed that in low inorganic N environments, high molecular-weight dissolved organic matter enrichment can contribute positively to the growth of P. delicatissima and Pseudo-nitzschia assemblages; this has been suggested as the ''missing'' nitrogenous source for sustenance of Pseudo-nitzschia during periods of depleted reserves of inorganic N. The effects of DON on DA production have not been studied to date.…”

Section: Nutritional Physiologymentioning

confidence: 99%

Pseudo-nitzschia physiological ecology, phylogeny, toxicity, monitoring and impacts on ecosystem health

et al. 2012

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“…Radionuclides can be transported by the river water and remain finally accumulated in the Ebro Delta area or also penetrate into the Mediterranean Sea, into which the river flows (Loureiro et al, 2009;Navarro et al, 2009). To verify this, sludge samples from rice fields located in the Ebro Delta area and superficial marine sediments from the region located in front of the Delta were analysed (see Fig.…”

Section: Solid Samplesmentioning

confidence: 99%

“…There are several industrial activities concentrated in the vicinity of the river which have caused contamination problems in the basin, and for this reason the study of the presence of different kinds of pollutants in Ebro river water is an issue of great concern, to evaluate the water quality and also the effects on the delta wildlife (Loureiro et al, 2009;Navarro et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Impact of industries in the accumulation of radionuclides in the lower part of Ebro river (Catalonia, Spain)

et al. 2010

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Ebro River extends over almost 930 km and is the main Spanish river entering theMediterranean Sea. There are several industries located along this river course including a dicalcium phosphate factory (DCP) and two nuclear power reactors. These installations, together with other factors such as the geology, can contribute to the radiological content of the river. Therefore, this study was performed to determine some natural and also some anthropogenic radionuclide concentrations in the Ebro River ecosystem. We analysed water samples, solid samples (rice field sludge and surface marine sediment samples), and also biota samples (Cladophora glomerata and Cynodon dactylon). For water samples, gross alpha, gross beta, tritium, uranium, thorium and also a group of gamma-emitting isotopes' activities were determined. The main contribution to radioactivity for these samples was due to some isotopes from the uranium and thorium chain. For the solid samples, we quantified some natural and artificial gamma radioisotopes, which may be related to the geological and/or industrial activities located in this zone. In the case of biota, the results indicate that the presence of the DCP has a significant influence, since the highest activity was observed in the surroundings of this industry (

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Pseudo-nitzschia spp. (Bacillariophyceae) and dissolved organic matter (DOM) dynamics in the Ebro Delta (Alfacs Bay, NW Mediterranean Sea)

Cited by 36 publications

References 65 publications

Hydrodynamic response in a microtidal and shallow bay under energetic wind and seiche episodes

Hydrodynamic response in a microtidal and shallow bay under energetic wind and seiche episodes

Pseudo-nitzschia physiological ecology, phylogeny, toxicity, monitoring and impacts on ecosystem health

Impact of industries in the accumulation of radionuclides in the lower part of Ebro river (Catalonia, Spain)

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