Riqueza y Composición del Zooplancton de Lagunas Saladas de la Región Pampeana Argentina

Echaniz, S.; Vignatti, Alicia María; Paggi, Susana José de; Paggi, Juan C.

doi:10.14409/fabicib.v9i1.759

Cited by 10 publications

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“…We have thus recently started studies on the ecology and zooplankton of saline lakes of La Pampa province, in the semiarid center of Argentina (Echaniz et al, 2005(Echaniz et al, , 2006Vignatti et al, 2007). However, in those works, we determined mainly the population density but not the biomass in relation with environmental parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Many of the conclusions on the functioning of saline lakes are applicable for the shallow lakes of La Pampa, but little is known on the ecology of the assemblages recorded in the central region of Argentina, where some species, especially crustaceans, are endemic to the neotropical region (Adamowicz et al, 2004;Echaniz et al, 2005Echaniz et al, , 2006Vignatti et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Claps et al 2004, Garibotti et al 2009) y a la Pampa occidental seca en la provincia de La Pampa (e.g. Echaniz & Vignatti 2002, Echaniz et al 2005. Las investigaciones sobre la diversidad planctó-nica del cuerpo de agua bajo estudio (laguna Sauce Grande) son muy escasos.…”

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Composition and abundance of the mesozooplancton in Sauce Grande shallow lake (Buenos Aires Province, Argentina)

Baleani

Menéndez

Alfonso

et al. 2017

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El objetivo del estudio fue analizar la composición y abundancia del mesozooplancton en la laguna Sauce Grande (Provincia de Buenos Aires, Argentina) durante el invierno y primavera (Hemisferio Sur) de 2010. Las muestras se colectaron mensualmente en tres estaciones, utilizando una red cónica de 200 μm de poro. El zooplancton estuvo representado por siete taxa. La abundancia varió entre 15,9±0,15 (agosto) y 71,7±31,77 ind/L (noviembre). Los grupos mejor representados fueron Copepoda y Cladocera, siendo Boeckella poopoensis y Moina micrura las especies dominantes respectivamente. Copepoda dominó en los meses más fríos del año mientras que Cladócera, lo hizo sobre fines de primavera. Esto último, podría asociarse a la marcada estacionalidad que experimenta la región.Palabras clave: Mesozooplancton, Laguna Sauce Grande, Argentina. AbstractComposition and abundance of the mesozooplancton in Sauce Grande shallow lake (Buenos Aires Province, Argentina)

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“…In the province of La Pampa, in the semi-arid central region of Argentina, although more than 100 water bodies have been surveyed since 1992, M. macrocopa was first recorded in December 1999, in a sub-saline shallow temporary lake (Bajo de La Tigra) and subsequently in other five water bodies (Echaniz et al 2005, Echaniz & Vignatti 2011, being last recorded in February 2007. Although its presence was reported, no specific information was provided.…”

Section: Introductionmentioning

confidence: 99%

Distribution and biological aspects of the introduced speciesMoina macrocopa (Straus, 1820) (Crustacea, Cladocera) in the semi-arid central region of Argentina

2013

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Moina macrocopa is common in eutrophic water bodies. Two subspecies have been described: M. macrocopa macrocopa (Straus, 1820), whose original distribution was restricted to the Old World, and M. macrocopa americanaGoulden, 1968, recorded only in North America. In 1994, the species was found in Bolivia, and in 1997 it was found in the northeast of Argentina. As the specimens belonged to M. macrocopa macrocopa in both cases, the authors suggested that it may have been introduced from the Old World by anthropogenic means. The aim of this study was to assess the distribution of M. macrocopa in La Pampa (Argentina), and provide information on its population characteristics under natural conditions. The species was recorded in six out of more than 100 water bodies surveyed; the specimens belong to M. macrocopa macrocopa. Although this species is not considered halophilic, the water bodies where it was found present high salinity (5.7 to 21.8 g.L–1). All are shallow, temporary and hypertrophic due to the agricultural activities carried out in their basins. Densities were between 1 and 312.6 ind.L–1. Size varied between 0.6 and 1.8 mm and some specimens were larger than those of other places. The parthenogenetic fraction predominated and the number of eggs ranged between 2 and 23. No correlations were found between density, size, or number of eggs and the environmental parameters studied. The presence of M. macrocopa in Pampean lakes could be due to the introduction of fish from hatcheries in the province of Buenos Aires, where it is used as food. Considering that the invasive character ofM. macrocopa has been recognized and that this study found that it is tolerant to a wide range of environmental conditions, attention should be paid to a possible displacement of its native congeneric species, typical of saline and temporary water bodies in central Argentina.

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Riqueza y Composición del Zooplancton de Lagunas Saladas de la Región Pampeana Argentina

Cited by 10 publications

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

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

Composition and abundance of the mesozooplancton in Sauce Grande shallow lake (Buenos Aires Province, Argentina)

Distribution and biological aspects of the introduced speciesMoina macrocopa (Straus, 1820) (Crustacea, Cladocera) in the semi-arid central region of Argentina

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