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

Vignatti, Alicia María; Paggi, Juan C.; Cabrera, Gabriela Cecilia; Echaniz, Santiago Andrés

doi:10.3856/vol40-issue4-fulltext-16

Cited by 18 publications

(22 citation statements)

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“…However, in EC, the reverse situation was found; EC had remained completely dry since 2004 and in February 2007, it reached a depth of 1.6 m, due to torrential summer rain typical for the region (Cano 1980). Although the lake then became hyposaline (Hammer 1986), the redissolution of salts from sediments caused a three-fold increase in the saline concentration, without large fluctuations in the depth, and thus, the salinity reached the mesosaline level in the last month of the study (Vignatti et al 2012). Salinity is an abiotic factor that can determine the zooplankton assemblage of South American aquatic ecosystems (Hurlbert et al 1986, Williams et al 1995, De los Ríos & Crespo 2004, Vignatti 2011, Battauz et al 2013, and therefore, one reason why B. poopoensis was recorded as present from October onwards, might be due to the recorded presence of Boeckella gracilis until the previous month, which is a much less salinity-tolerant species but a potential competitor of B. poopoensis.…”

Section: Discussionmentioning

confidence: 99%

Biology of Boeckella poopoensis Marsh, 1906 (Copepoda, Calanoida) in natural conditions in temporary saline lakes of the central Argentina

2016

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Boeckella poopoensis Marsh, 1906 is the dominant copepod in saline lakes from northern Patagonia to southern Peru. It is a tolerant species, which has been registered at salinities between 20 and 90 g.L -1 , and is important because it integrates the diet of flamingos and fishes of commercial and sport interest. The aims of this study were to analyze the characteristics of populations of B. poopoensis in the central region of Argentina and to establish their relationships with environmental parameters. Monthly samples during 2007 were taken in four temporary lakes of La Pampa province. Environmental parameters and density, size, biomass, number and size of eggs were determined. The salinity ranged between 13.38 and 32.90 g.L -1. In three lakes that had previously continuously contained water, B. poopoensis was registered throughout the whole study. In the fourth lake, which was filled in January, it was present only when salinity exceeded 15 g.L -1. The population of the lake that was filled differed from that of the other lakes in terms of the density and biomass of adults and copepodites. The number of ovigerous females represented a higher percentage of the population during the colonization of the lake that had been dried and these produced the highest number of eggs. In the three lakes in which B. poopoensis was always recorded, its characteristics were more influenced by the availability of food than by temperature or salinity. It was found that the strategies of the species vary throughout the hydroperiod; at the beginning, thrives when the salinity rises and impedes the presence of less tolerant species. At this point, the production of relatively small eggs is high, allowing rapid colonization. When the lakes become relatively stable, B. poopoensis allocates more energy to reach larger sizes and although egg production is not so high, they are larger, allowing it to maintain stable populations. Keywords: Boeckella poopoensis, halophilic copepods, saline lakes, temporary lakes. Resumen: Boeckella poopoensis Marsh, 1906 es el copépodo dominante en lagos salinos desde el norte de Patagonia hasta el sur del Perú. Es una especie halotolerante registrada con salinidades entre 20 y 90 g.L -1 y es importante dado que integra la dieta de flamencos y de peces de interés comercial o deportivo. El objetivo del estudio fue analizar características de poblaciones de B. poopoensis en la región central de Argentina y establecer sus relaciones con los parámetros ambientales. Durante 2007 se tomaron muestras mensuales en cuatro lagos temporarios de la provincia de La Pampa. Se determinaron parámetros ambientales y la densidad, espectro de tallas, biomasa, número y tamaño de los huevos. La salinidad varió entre 13,38 and 32,90 g.L -1. En tres lagos que habían contenido agua en forma continua, B. poopoensis se registró durante todo el estudio. En el cuarto, que se llenó en enero, sólo estuvo presente cuando la salinidad superó 15 g.L -1. La densidad y biomasa de los adultos y copepoditos de la población del la...

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Section: Discussionmentioning

confidence: 99%

Biology of Boeckella poopoensis Marsh, 1906 (Copepoda, Calanoida) in natural conditions in temporary saline lakes of the central Argentina

2016

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“…To the day, little is known about the ecological dynamics of species inhabiting a temporary water body as it experiences environmental transitions. Species replacement is one of such ecological dynamics, and it involves the emergence of organisms from sediments (resting egg bank) (Williams, 1987; Belk, 1998;Schwartz & Jenkins, 2000;Vignatti et al 2012b). This issue is of primary interest, because species assemblages recorded in the lakes of central Argentina differ from those in other continents.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This issue is of primary interest, because species assemblages recorded in the lakes of central Argentina differ from those in other continents. Particularly, many endemic species to the Neotropical region are represented (Adamowicz et al 2004; Echaniz, 2010; Echaniz et al 2006; 2012; Vignatti, 2011;Vignatti et al 2012b;2016), and ecological knowledge about them is relatively scarce.The present study aimed to describe the variation in species composition, and in three biological parameters (i.e. individual density, biomass, and body size) of a zooplankton community inhabiting a saline, shallow, and temporary lake, that underwent drying in La Pampa Province.…”

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Environmental and zooplankton parameter changes during the drying of a saline shallow temporary lake in central Argentina

Vignatti¹,

Cabrera

Canosa³

et al. 2017

Univ. Sci.

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Central Argentina has numerous saline lakes sustained by groundwater sources and rainfall. These lakes are temporary and experience significant changes in water level and salinity, depending on wet and dry climate cycles. This study aims to investigate the scarcely known dynamics of environmental and zooplankton parameters during the drying phase of one of these lakes. Monthly samples were taken from December 2 012 to July 2 013 in the Ojo de Agua Uriburu lake, previous to its drying. At the beginning of the study, the lake's depth was 0.7 m and its salinity was 16.65 g L −1 , later, in July, its depth decreased to 0.06 m and its salinity increased to 92.9 g L −1 . Zooplankton species richness was low (three crustaceans and three rotifers), with Boeckella poopoensis and Moina eugeniae dominating in the system. Maximum density and biomass were attained by the two dominant species in April (318.5 i nd L −1 and 3 029.1 µg L −1 dry weight; and 242.4 i nd L −1 and 1 530.4 µg L −1 dry weight, for B. poopoensis and M. eugeniae, respectively), and no correlation was found between these parameters and salinity. Maximum average body lengths for both species were observed in the last months of sampling (M. eugeniae: 1 020 ± 84.2 µm and B. poopoensis: 1 348.8 ± 89.0 µm). At this point of the study, neither juvenile nor larval stages were found. The increase in average body size is, arguably, the result of increased salinity in the system through a negative effect on reproduction. Because this lake reached hypersalinity, its ecological dynamics are unique among those of other temporary, saline lakes that dried in central Argentina. Similar studies on other temporary ecosystems are needed to increase the information on these little known ecological aspects.Keywords: temporary lake; saline lake; hydroperiod; zooplankton; Boeckella poopoensis; Moina eugeniae. IntroductionTemporary lakes contain water during periods as short as a few months and up to several years (Schwartz & Jenkins, 2000). These lakes are globally distributed, and their sizes range from a few square meters to hundreds of (Williams, 1987;Schwartz & Jenkins, 2000). Many of these ecosystems are disappearing because of anthropic activity, including their transformation into agricultural fields (Belk, 1998;Williams, 2002;Jenkins et al. 2003; Eitam et al. 2004). The transformation and destruction of these ecosystems leads to species loss, thus significantly affecting local biodiversity (Waterkeyn et al. 2008).Most water bodies in La Pampa province, a central semiarid region of Argentina, are shallow (maximum depth < 3 m), temporary lakes. These lakes occur in arheic basins, where surface runoff flows unpredictably due to lack of drainage patterns (Mann, 2002; World Meteorological Organization, 2012;Meybeck et al. 2013), and they are formed by phreatic input and, to a lesser extent, by rainfall (Dornes et al. 2016).Most of the Pampean temporary lakes are saline; with ions such as Na + and Cl − predominating in their composition (Echaniz, 2010), and concentr...

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“…Its zooplankton is characterized by a frequent association of endemic halophilic cladocerans, among which Daphnia menucoensis and Moina eugeniae ( Fig. 1) are the most important [1,8,9,10] The presence of one species of the genus Daphnia is interesting, since the members of this taxon are relatively scarce in saline ecosystems [11,12,13]. This genus may have originated in freshwater where it is more widely distributed [14,15].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Optimal Culture Medium and Salts for Bioassays with Neotropical Halophilic Cladocerans

Alicia¹,

Gabriela²,

Santiago³

2014

AJLS

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Abstract:The neotropical halophilic cladocerans Daphnia menucoensis and Moina eugeniae are common in shallow lakes of semi-arid central and northern Patagonia in Argentina. In the present study, we determined the tolerance of neonates of both species to salinity and different concentrations of Cl -and SO 4 2-. However, the responses differed according to the demineralized water or groundwater employed to dissolve the salts. On the other hand, survival was lower when using analytical grade reagents instead of natural salts. As bioassays should be developed to determine the chronic physiological responses of both species, the objectives of this study were to compare three culture media and test the hypothesis that natural salts dissolved in aquifer water is the optimal combination for breeding. Acute bioassays were conducted with neonates of both species. To compare the media, NaCl solutions (5, 10, 15, 20 and 25 g.L -1 ) were prepared using demineralized water, aquifer water and EPA medium. For the second objective, solutions of equal concentrations were prepared with salts obtained from the natural environment, previously sterilized, and dissolved in phreatic water. Survival was higher in the aquifer water, whose chemical composition was relatively more representative of the lakes inhabited by both species. It was almost complete at 20 and 15 g.L -1 for D. menucoensis and M. eugeniae, respectively. Lower survival of D. menucoensis was found in EPA medium, although it was developed for breeding other species of Daphnia. In the second series of bioassays, survival was almost complete until 20 g.L -1 (D. menucoensis) and 25 g.L -1 (M. eugeniae). The combination natural salts/aquifer water was adequate to assess the tolerance of both cladocerans. However, the former was more important, since the results were consistent with previous studies when these salts were dissolved in demineralized water. In addition, survival was much higher than when we used salts of analytical grade.

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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

Cited by 18 publications

References 52 publications

Biology of Boeckella poopoensis Marsh, 1906 (Copepoda, Calanoida) in natural conditions in temporary saline lakes of the central Argentina

Biology of Boeckella poopoensis Marsh, 1906 (Copepoda, Calanoida) in natural conditions in temporary saline lakes of the central Argentina

Environmental and zooplankton parameter changes during the drying of a saline shallow temporary lake in central Argentina

Determination of the Optimal Culture Medium and Salts for Bioassays with Neotropical Halophilic Cladocerans

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