Temporal and spatial trends in the sedimentation process in a canyon-type reservoir (El Gergal, Seville, Spain)

Vicente, Inmaculada de; Amores, Victoria; Escot, C.; Basanta, Ana; Cruz-Pizarro, L.

doi:10.1127/0003-9136/2005/0163-0241

Cited by 9 publications

(13 citation statements)

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“…A previous study of temporal and spatial trends in the sedimentation process in El Gergal (de Vicente et al 2005) revealed marked horizontal heterogeneity in the magnitude of particulate organic matter settling fluxes, related to wind-induced mass movement of water (among other conditions). It also describes a significant positive correlation between the Chl-a concentration and the settling flux of autochthonous (planktonic origin) detritus at some sites of the reservoir horizontal plane.…”

Section: Discussionmentioning

confidence: 97%

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The spatial distribution of different phytoplankton functional groups in a Mediterranean reservoir

Moreno-Ostos

Cruz-Pizarro

Basanta³

et al. 2007

Aquat Ecol

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A new high-resolution spectrofluorimetric probe and an automatic water-quality monitoring station (AWQMS) have been used to record seasonal variations in the spatial distribution of three functional groups of phytoplankton in a Mediterranean water-supply reservoir. In comparison with classical methods, the combined use of these innovative techniques enables development of faster and less laborious spatial distribution surveys, thus favouring higher-frequency and spatially more detailed measurements, and, consequently, a better understanding of phytoplankton dynamics. The results show that the observed variations can be explained by the interaction between the buoyancy properties of the phytoplankton and the mixing characteristics of the reservoir. During the winter, when the lake was isothermal and the phytoplankton was dominated by diatoms, there was no significant spatial variation. In the spring, when the phytoplankton was dominated by chlorophytes there was also very little variation but some motile species formed patches when the wind speed was low. The most pronounced nonuniform distributions of phytoplankton were observed during the summer when the phytoplankton community was dominated by positively buoyant cyanobacteria. Then there was a very strong link between the vertical and horizontal gradients which were also related to the prevailing meteorological conditions.

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Section: Discussionmentioning

confidence: 97%

“…Trophically, the reservoir has been classified as eutrophic-hypertrophic (Moreno-Ostos 2004;de Vicente 2005). Table 1 summarizes the trophic characteristics of the reservoir using values from a range of water-quality variables recorded in El Gergal between 1979 and 2003.…”

Section: Study Sitementioning

confidence: 99%

The spatial distribution of different phytoplankton functional groups in a Mediterranean reservoir

Moreno-Ostos

Cruz-Pizarro

Basanta³

et al. 2007

Aquat Ecol

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“…2B). The trophic state of the reservoir has been classified as eutrophic-hypertrophic (De Vicente et al, 2005;Moreno-Ostos et al, 2008a). The mixing regime in El Gergal reservoir is warm monomictic (Moreno-Ostos et al, 2008a).…”

Section: Study Sitementioning

confidence: 99%

The influence of external perturbations on the functional composition of phytoplankton in a Mediterranean reservoir

et al. 2009

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The changes in abundance and composition experienced by phytoplankton communities in lakes and reservoirs occur in response to variations in the physical (light climate or energy) and the chemical (nutrient availability or resources) constraints for algal growth. Mediterranean reservoirs are very dynamic systems, subject to frequent changes in the physical environment as a result of water management operations, which suggests that phytoplankton communities might also undergo frequent changes. The phytoplankton community composition, abundance and seasonal dynamics of El Gergal, a medium-size Mediterranean reservoir, is analyzed and interpreted in terms of changes in the nutrient-energy balance. It is demonstrated that the seasonal scale changes in the physical environment trigger the seasonal predictable autogenic dynamics of the phytoplankton community. In addition, frequent short-term external perturbations of the physical environment may also induce allogenic shifts and reversions in the succession. The physical changes occur mainly as a result of variations in the outflows. Results are discussed in terms of phytoplankton functional groups life cycle strategies and water quality management.

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“…Sedimentation is a fundamental process connecting plankton with benthic communities (Bloesch & Uehlinger, 1986). Although seasonal fluctuations and vertical variations in settling rate are recognised as important and have been widely studied (i.e., Hupfer et al, 1995;Penn & Auer, 1997;de Vicente et al, 2005), horizontal differences have rarely been taken into account (Bloesch, 1982;Weyhenmeyer et al, 1997). In addition, although the exposure time for collecting settled matter has been identified as a key issue, most of the existing studies consider exposure times longer than two weeks (Pejrup et al, 1996;Weyhenmeyer et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

Nutrient and sediment dynamics in a Mediterranean shallow lake in southwest Spain

Vicente¹,

García²,

Pozo³

et al. 2012

Limnetica

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Nutrient and sediment dynamics in a Mediterranean shallow lake in southwest SpainTemporal and spatial variations in the nutrient concentrations of lake water and surface sediments and in settling and resuspension rates were assessed in a Mediterranean shallow lake (Medina Lake, southern Spain) using a combination of shortterm and long-time monitoring. Our results confirmed the high temporal (inter-and intra-annual) variability characterising Mediterranean shallow lakes, which is also enhanced by water level fluctuations. The results also underlined the crucial role of phosphorus (P) exchange across the sediment-water interface in controlling P dynamics in lake water. This statement is supported by (i) the existence in the upper 1 cm of the sediment of 18 times the mass of TP of the whole water column and, hence, the high potential impact of P released from the sediment into the overlying column and by (ii) the strong P limitation of planktonic primary production, as reflected by a DIN:TP atomic ratio much higher than 16. Resuspension, co-precipitation with CaCO 3 and adsorption onto iron hydroxides (FeOOH) all had major effects on the P exchange across the sediment-water interface. Wind-induced resuspension (31 ± 13 % of the settled matter) explained the extremely high gross sedimentation rates (40 ± 11 g m -2 d -1 ) recorded for a 24 h period. P adsorption onto FeOOH controlled internal P loading during the winter (FeOOH: P mobile > 15). During the summer, the low availability of FeOOH (Fe:P mobile < 15) reflected the inability of FeOOH to control P adsorption. The SRP concentrations in lake water were much higher than necessary for CaCO 3 and P co-precipitation, explaining the high contribution of P bound to CaCO 3 (P HCl ) to the total P in the sediment of the study site and demonstrating the importance of CaCO 3 precipitation for removing P from lake water.

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Temporal and spatial trends in the sedimentation process in a canyon-type reservoir (El Gergal, Seville, Spain)

Cited by 9 publications

References 0 publications

The spatial distribution of different phytoplankton functional groups in a Mediterranean reservoir

The spatial distribution of different phytoplankton functional groups in a Mediterranean reservoir

The influence of external perturbations on the functional composition of phytoplankton in a Mediterranean reservoir

Nutrient and sediment dynamics in a Mediterranean shallow lake in southwest Spain

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