Seasonal dynamics of a large, shallow lake, laguna Chascomús: The role of light limitation and other physical variables

Torremorell, Ana; Bustigorry, José; Escaray, Roberto Ulises; Zagarese, Horacio

doi:10.1016/j.limno.2006.09.002

Cited by 58 publications

(69 citation statements)

References 19 publications

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“…Most of the aquatic ecosystems of La Pampa are temporary, a feature which differentiates them from typical pampean or pampasic lakes located in the province of Buenos Aires (Ringuelet, 1972;Torremorell et al, 2007), which are characterized by being permanent.…”

Section: Discussionmentioning

confidence: 99%

Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa Argentina

Vignatti¹,

Paggi²,

Cabrera³

et al. 2012

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ABSTRACT. Temporary water bodies can remain active as such for varying periods. However, they are reservoirs (as "egg banks") of species adapted to these special conditions. In central Argentina, there are numerous temporary lakes, which have only recently begun to be studied. The aim of this work was to describe the succession of changes in diversity, abundance and biomass of zooplankton as well as in the environment, over a period of eleven months, as from the filling of a temporary saline lake, and test the hypothesis that i) salinity affects negatively the richness and abundance but positively the biomass, and ii) due to changes in environmental conditions produced by advancing the hydroperiod, different species emerge from the egg bank at different times. At the beginning, when salinity was reduced and the concentration of chlorophyll-a was higher, we recorded the highest diversity, due mainly by less tolerance species. Later, as salinity increased, the macrophyta Ruppia cirrhosa developed and covered 90% of the surface of the lake, the concentration of chlorophyll-a decreased and the water transparency increased. The zooplankton richness decreased and the community was integrated only by halotolerant species. In the first two months, there was an increased replacement of species, indicated by the high value of Whittaker's beta diversity index (0.63), the density was high, with a predominance of microzooplankton, so the registered biomass was relatively reduced. Then, abundance decreased markedly, and was mostly dominated by macrozooplankton, so the biomass increased. When salinity exceeded 11 g L -1 , there was a predominance of the halophilic cladoceran Daphnia menucoensis, a species of ecological importance because it's high grazing pressure on phytoplankton. In this study, in addition to the modulating effect of salinity on the richness, abundance and zooplankton biomass, it was verified that the diversity present in the egg bank of temporary saline lakes is higher than that recorded in the water column at any time during hydrophases. Keywords: temporary lakes, saline lakes, Daphnia menucoensis, egg bank, central Argentina.Diversidad zooplanctónica y su relación con cambios ambientales luego del llenado de una laguna salina temporaria de la región semiárida de La Pampa, Argentina RESUMEN. Los cuerpos de agua temporarios pueden permanecer activos durante períodos variables, pero son reservorios ("bancos de huevos") de especies adaptadas a estas especiales condiciones. En el centro de Argentina existen numerosos lagos temporarios, que sólo recientemente han comenzado a ser estudiados. El objetivo de este trabajo fue describir la sucesión de cambios en la diversidad, abundancia y biomasa de zooplancton y en los parámetros ambientales, durante once meses, a partir del llenado de un lago salino temporario y probar las hipótesis de que i) la salinidad afecta negativamente la riqueza y abundancia pero positivamente a la biomasa y ii) debido a los cambios ambientales producidos al avanzar el hidroperíodo, difer...

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Section: Discussionmentioning

confidence: 99%

Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa Argentina

Vignatti¹,

Paggi²,

Cabrera³

et al. 2012

lajar

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“…According to the model of alternative states of shallow lakes, they are organic turbid environments (Torremorell et al 2007, Allende et al 2009) and their primary production is dominated by phytoplankton due to the absence of macrophytes.…”

Section: Discussionmentioning

confidence: 99%

Zooplankton richness, abundance and biomass of two hypertrophic shallow lakes with different salinity in central Argentina

et al. 2012

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The zooplankton of lakes is controlled by biological and physico-chemical parameters. Among the former, predation by fish can determine the replacement of large-sized species by small-sized ones and among the latter, salinity exerts negative effects on richness and abundance. Since it has been suggested that saline lakes without fishes have higher zooplankton biomass than low salinity ones, the aim of this study was to determine the richness, abundance and biomass of zooplankton in two lakes with different salinity and test the hypothesis that in the presence of zooplanktivorous fishes and at equal concentrations of nutrients and chlorophyll-a, saline lakes have higher biomass than those with low salinity. The study was conducted in two shallow lakes of the Province of La Pampa (central Argentina): a subsaline lake and a hyposaline lake, which shared high concentrations of chlorophyll-a and total phosphorus, reduced transparency and presence of planktivorous fish. Zooplankton richness was different and higher in the subsaline lake, whereas abundance and total biomass were similar, even when the taxonomic groups were considered separately. It is suggested that the presence of a halotolerant planktivorous fish controlled the size of zooplankton due to the predation on larger species and prevented the development of higher biomass in the saline lake, which is an important difference from previously recorded situations. This study shows that, regardless of the differences in salinity, the top-down effect in the food chain may have been a factor that equalized the zooplankton biomass by allowing only the development of small species and highlights the possible importance of fish predation in determining chlorophyll-a concentrations and water transparency.

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“…The Prato lake is located in the western boundary of the Pampean plain (Cabrera, 1976), and although it shares characteristics with typical Pampean lakes of the province of Buenos Aires (Ringuelet, 1968 and1972;Torremorell et al, 2007), such as the reduced depth and the polymixis, it differs from them because of its seasonality and great variations in water level and salinity.…”

Section: Discussionmentioning

confidence: 99%

“…The aims of this work were to analyze the variations in the main limnological parameters and the zooplankton of an inorganic turbid shallow lake with high salinity, located in the north of La Pampa province, along its annual cycle, and to test the following hypotheses: i) that the high concentration of dissolved solids affects the taxonomic composition and abundance of the zooplankton community, ii) that inorganic turbidity has detrimental effects on the development of zooplankton (Quirós et al, 2002;Torremorell et al, 2007), and iii) that at nutrient concentrations equal to those of other Pampean water bodies with lower salinity, this lake has a higher biomass of zooplankton, in agreement with that reported by Evans et al (1996) for lakes of Canada.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation and influence of turbidity and salinity on the zooplankton of a saline lake in central Argentina

Echaniz

Vignatti

2011

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ABSTRACT. The limnology of saline water bodies at other latitudes is fairly well known, but in Argentina such studies have only recently begun. The applicability of many conclusions regarding the functioning of these environments around the world is limited due to the scant ecological knowledge of some endemic species recorded in the assemblages of Argentine lakes. The aims of this work were to determine the effects of salinity and inorganic turbidity on the taxonomic composition, abundance, and zooplankton biomass in a shallow, hypereutrophic, mesosaline lake in the north of La Pampa province characterized by seasonality, variations in level and salinity, and the lack of macrophytes and fishes, and to compare it with other shallow lakes of the province. We found important differences with other saline lakes: the species richness was lower; the mean abundance of zooplankton was between four and six times higher; and rotifers, which were not affected by salinity or the concentration of inorganic suspended solids, were numerically predominant. Crustaceans, on the other hand, were negatively affected by these environmental factors. Biomass was twofold higher than that recorded in the same period in two shallow lakes of Pampa, with similar nutrient concentrations but lower salinities. Keywords: saline lakes, inorganic turbidity, zooplankton biomass, Boeckella poopoensis, Argentina.Variación estacional e influencia de la turbidez y la salinidad sobre el zooplancton de un lago salino de la región central de Argentina RESUMEN. La limnología de los cuerpos de agua salinos de otras latitudes es bastante conocida, pero en Argentina se ha comenzado a estudiar recientemente. Muchas conclusiones sobre el funcionamiento de estos ambientes a nivel mundial son de aplicación restringida debido a que las asociaciones registradas en los lagos argentinos tienen algunas especies endémicas, cuyo conocimiento ecológico es escaso. Los objetivos de este trabajo fueron determinar los efectos de la salinidad y la turbidez inorgánica sobre la composición taxonómica, abundancia y biomasa zooplanctónica en un lago somero mesosalino hipereutrófico del norte de La Pampa, caracterizado por su temporalidad, variaciones del nivel y salinidad, carencia de macrófitas y peces, y compararlo con otros lagos someros de la provincia. Se encontraron importantes diferencias con otros lagos salinos, la riqueza específica fue menor, la abundancia media del zooplancton fue entre 4 a 6 veces superior y el predominio numérico fue de los rotíferos, que no fueron afectados por la salinidad o la concentración de sólidos suspendidos inorgánicos, a diferencia de los crustáceos, que fueron afectados negativamente por estos factores ambientales. La biomasa fue dos veces más elevada que la registrada en el mismo período en dos lagos someros pampeanos con parecida concentración de nutrientes pero con salinidades menores.

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Seasonal dynamics of a large, shallow lake, laguna Chascomús: The role of light limitation and other physical variables

Cited by 58 publications

References 19 publications

Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa Argentina

Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa Argentina

Zooplankton richness, abundance and biomass of two hypertrophic shallow lakes with different salinity in central Argentina

Seasonal variation and influence of turbidity and salinity on the zooplankton of a saline lake in central Argentina

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