Nutrients, Conductivity and Plankton in a Landscape Approach to a Pampean Saline Lowland River (Salado River, Argentina)

Gabellone, Néstor Adrián; Claps, María Cristina; Solari, Lía Cristina; Neschuk, Nancy Carolina

doi:10.1007/s10533-005-3273-9

Cited by 46 publications

(80 citation statements)

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“…The highest total-phosphorus concentration (2,237 mg L À1 ; St. 4) was detected in summer 1997. The lowest total-phosphorus concentrations were recorded in the lower basin (St. 9), but there the same trend was maintained as in the headwater stations, with total-phosphorus values lower than 600 mg L À1 (Gabellone et al, 2005). The headwaters of the river, consisting in the effluent from large shallow lakes, are of variable volume depending on the season and weather conditions.…”

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confidence: 75%

“…The mean annual rainfall was 870 mm and the mean annual temperature 148C (mean temperatures for summer: 22.38C, autumn: 15.68C, winter: 9.38C and spring: 15.88C). The concentration of chlorophyll a, as an estimation of phytoplankton biomass, was at a maximum (599 mg m À3 ) through the spring and summer in the headwaters of the basin (St. 4), but at a minimum (2.5 mg m À3 ) through the autumn and winter in a tributary (St. 2; Gabellone et al, 2005). The Salado basin is divided into two distinct geographic regions in terms of land use, whose areas produce clear differences in the water chemistry.…”

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confidence: 99%

“…Different zones can be distinguished within the basin on the basis of geological, soil and agricultural influences as well as ecological characteristics. These selected zones involve different limnological parameters, such as concentration-flow relationships, and have been described in detail by Gabellone et al (2003Gabellone et al ( , 2005Gabellone et al ( , 2008.…”

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confidence: 99%

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Influence of regional factors on zooplankton structure in a saline lowland river: the Salado River (Buenos Aires province, Argentina)

Claps

Gabellone

Neschuk

2008

River Research & Apps

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Knowledge of regional factors influencing zooplankton structure in a semiarid river must include both the main channel and any tributaries in order to identify spatial and temporal patterns along with the main factor that affect the zooplankton community. Accordingly, seasonal samples were taken during 1997-1999 at 15 stations in the Salado River basin, where 172 species were identified (53 protozoans, 88 rotifers and 31 crustaceans). Conductivity and temperature optima and tolerances were calculated for the evident taxa. Different assemblages were recognized by cluster analysis, on the basis of their temperature and conductivity preferences. With respect to the zooplankton assemblages, three zones can be distinguished along the longitudinal axis of the basin: (1) the headwaters (the effluent from large saline shallow lakes), (2) the inter-tributaries, and (3) the lower basin and associated shallow lakes. The spatial distribution of the assemblages was a result of the combined action of factors always promoting the dominance of rotifers. The influence of floodplain waters (backwater ponds, waterlogged depressions, flushing lakes) was attenuated progressively downstream, thus producing disadvantages for the crustaceans. The food availability and high nutrient concentrations related to land use in the headwaters favoured the co-dominance of cladocerans and copepods along with the rotifers in that region.

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confidence: 75%

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confidence: 99%

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Influence of regional factors on zooplankton structure in a saline lowland river: the Salado River (Buenos Aires province, Argentina)

Claps

Gabellone

Neschuk

2008

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“…Consequently, for the purposes of this paper we disregarded the study of plant cover and connectivity patterns as templates for fish assemblage structure. Conversely, we considered the two main spatial axes along which these lakes may be described; a first axis of landscape human development (Rosso & Quirós, 2007) and a second abiotic axis of total salinity of their waters (Gabellone et al, 2005). Accordingly to these directive gradients, these lakes display a spatial variation in the NO 3 :NH 4 ratio and water conductivity respectively (Rosso & Quirós, 2009).…”

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confidence: 99%

“…Following this concept we may assume that once the species "reached" the upper Salado River lakes in the past, they dispersed among them following major environmental gradients in relation with their autoecology. Indeed, one striking feature of this system is its unusual high concentrations of sodium chloride derived from a sedimentary aquifer located in its headwaters, which originated during arid periods of the Pleistocene (Gabellone et al, 2005). It is quite probably, therefore, that this factor had historically filtered much of the potential regional fauna and forced those species able to reach these waters to disperse in accordance with their tolerance to salinity.…”

Section: Patterns In Species Richness and Assemblage Diversitymentioning

confidence: 99%

Patterns in fish species composition and assemblage structure in the upper Salado River lakes, Pampa Plain, Argentina

Rosso

Quirós

2010

Neotrop. ichthyol.

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The Pampa Plain, in the central region of Argentina, is mostly drained by the Salado River. The fish fauna of this river is mostly known from field collections in lower reach lakes. Consequently, we aimed to explore the composition and structure of the fish assemblages in the upper Salado River lakes. Patterns in dominance and persistence of species and assemblage level attributes were correlated with environmental and human activity-derived (NO 3 :NH 4 ) variables. Overall, 19,913 individuals of 17 species included in 5 orders and 11 families were collected. Several species are first records for the upper Salado River lakes. There was a marked proliferation of species in the family Characidae. Conversely, the remainder 10 families were only represented by one or two species. The species composition along the study lakes changed slightly but their relative contribution to the total fish collected (dominance) varied greatly. Rather few species were present in all collections suggesting an important interannual variability in assemblage stability. The gradient in water conductivity was an important factor for the persistence of particular species in the lakes. The gradients in water conductivity and NO 3 :NH 4 ratio were associated with particular fish communities dominated by different groups of species. These results suggest that even when broad management and conservation strategies should encompass the system as a whole, lake-specific approaches must also be addressed. Overall, our results highlight that human impacts on surface waters may interact with environmental factors to influence the dynamics of fish species and the structure of their communities.A planície pampeana, na região central da Argentina, é em grande parte drenada pelo rio Salado. A ictiofauna desse rio é conhecida principalmente pelos estudos conduzidos nos lagos dos segmentos inferiores do rio. Em consequência, procuramos examinar a composição e a estrutura das assembleias de peixes dos lagos do alto rio Salado. Os padrões na dominância e persistência das espécies e os atributos das assembleias de peixes foram correlacionados com variáveis ambientais e variáveis indicadoras de perturbações antropogênicas (NO 3 :NH 4 ). Foram coletados 19913 indivíduos de 17 espécies pertencentes a 5 ordens e 11 famílias. Várias espécies foram registradas pela primeira vez para as lagoas do alto rio Salado. Houve uma marcada proliferação de espécies da família Characidae. Em contraste, as 10 famílias de peixes restantes foram representadas por uma ou duas espécies. A composição de espécies variou pouco ao longo dessas lagoas mas sua contribuição ao total de peixes coletados (dominância) foi muito variável. Poucas espécies estiveram presentes em todas as coletas, sugerindo uma importante variação interanual na estabilidade da assembleia de peixes. O gradiente na condutividade elétrica da água foi importante fator para a persistência de algumas espécies nessas lagoas. A condutividade elétrica da água e o gradiente na relação NO 3 :NH 4 estiveram associados com...

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What does it take to flood the Pampas?: Lessons from a decade of strong hydrological fluctuations

Kuppel

Houspanossian

Nosetto

et al. 2015

Water Resources Research

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While most landscapes respond to extreme rainfalls with increased surface water outflows, very flat and poorly drained ones have little capacity to do this and their most common responses include (i) increased water storage leading to rising water tables and floods, (ii) increased evaporative water losses, and, after reaching high levels of storage, (iii) increased liquid water outflows. The relative importance of these pathways was explored in the extensive plains of the Argentine Pampas, where two significant flood episodes (denoted FE1 and FE2) occurred in 2000-2003 and 2012-2013. In two of the most flood-prone areas (Western and Lower Pampa, 60,000 km 2 each), surface water cover reached 31 and 19% during FE1 in each subregion, while FE2 covered up to 22 and 10%, respectively. From the spatiotemporal heterogeneity of the flood events, we distinguished slow floods lasting several years when the water table is brought to the surface following sustained precipitation excesses in groundwater-connected systems (Western Pampa), and ''fast'' floods triggered by surface water accumulation over the course of weeks to months, typical of poor surface-groundwater connectivity (Lower Pampa) or when exceptionally strong rainfalls overwhelm infiltration capacity. Because of these different hydrological responses, precipitation and evapotranspiration were strongly linked in the Lower Pampa only, while the connection between water fluxes and storage was limited to the Western Pampa. In both regions, evapotranspirative losses were strongly linked to flooded conditions as a regulatory feedback, while liquid water outflows remained negligible.

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Nutrients, Conductivity and Plankton in a Landscape Approach to a Pampean Saline Lowland River (Salado River, Argentina)

Cited by 46 publications

References 23 publications

Influence of regional factors on zooplankton structure in a saline lowland river: the Salado River (Buenos Aires province, Argentina)

Influence of regional factors on zooplankton structure in a saline lowland river: the Salado River (Buenos Aires province, Argentina)

Patterns in fish species composition and assemblage structure in the upper Salado River lakes, Pampa Plain, Argentina

What does it take to flood the Pampas?: Lessons from a decade of strong hydrological fluctuations

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