Hydrochemistry, isotope studies and salt formation in saline lakes of arid regions: Extra-Andean Patagonia, Argentina

Crustacean communities in saline lakes are regulated mainly by salinity, and a significant inverse correlation can be found between salinity and species richness. The aim of the present study is to compare the carcinological diversity of two distinct arid regions of the world: Algerian saline lakes, locally called “chotts” and “sebkhas”, and their Chilean Altiplano counterparts, and to determine if there are similar regulator patterns that influence the composition of those communities. The main halophilic taxon common to both regions was the anostracan Artemia at high salinities. However, many other halotolerant crustaceans may occur in Algerian chotts and sebkhas, such as Phallocryptus spinosa, Branchinectella media, Moina salina, Cletocamptus retrogressus, Arctodiaptomus salinus and Heterocypris sp. In Chilean saline lakes the calanoid copepod Boeckella poopoensis was an important component of zooplankton at high salinities, while ostracods were totally absent. The results of correlation analysis revealed a significant inverse correlation between salinity and species number (Algeria, , , p-value = 0.0032; Chile, , ; p-value < 0.0165). The results of null model analysis describing species co-occurrence showed that the species communities are random for Algerian saline lakes due to the presence of many halotolerant species. For Chilean saline lakes, the species communities are structured.

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A systematic examination of the relationships between CDOM and DOC in inland waters in China

Hydrology and Earth System Sciences ◽

10.5194/hess-21-5127-2017 ◽

2017 ◽

Vol 21 (10) ◽

pp. 5127-5141 ◽

Cited By ~ 13

Author(s):

Kaishan Song ◽

Ying Zhao ◽

Zhidan Wen ◽

Chong Fang ◽

Yingxin Shang

Keyword(s):

Organic Matter ◽

Saline Lakes ◽

Arid Regions ◽

Vital Role ◽

Inland Waters ◽

River Waters ◽

Remotely Sensed Imagery ◽

Lake Waters ◽

The Relationship

Abstract. Chromophoric dissolved organic matter (CDOM) plays a vital role in the biogeochemical cycle in aquatic ecosystems. The relationship between CDOM and dissolved organic carbon (DOC) has been investigated, and this significant relationship lays the foundation for the estimation of DOC using remotely sensed imagery data. The current study examined samples from freshwater lakes, saline lakes, rivers and streams, urban water bodies, and ice-covered lakes in China for tracking the variation of the relationships between DOC and CDOM. The regression model slopes for DOC vs. aCDOM (275) ranged from extremely low 0.33 (highly saline lakes) to 1.03 (urban waters) and 3.01 (river waters). The low values were observed in saline lake waters and waters from semi-arid or arid regions, where strong photobleaching is expected due to less cloud cover, longer water residence time, and daylight hours. In contrast, high values were found in waters developed in wetlands or forest in Northeast China, where more organic matter was transported from catchment to waters. The study also demonstrated that closer relationships between CDOM and DOC were revealed when aCDOM (275) were sorted by the ratio of aCDOM(250)∕aCDOM (365), which is a measure for the CDOM absorption with respect to its composition, and the determination of coefficient of the regression models ranged from 0.79 to 0.98 for different groups of waters. Our results indicate the relationships between CDOM and DOC are variable for different inland waters; thus, models for DOC estimation through linking with CDOM absorption need to be tailored according to water types.

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Material Sources and Model of Salt Formation of Saline Lakes

An Introduction to Saline Lakes on the Qinghai—Tibet Plateau - Monographiae Biologicae ◽

10.1007/978-94-011-5458-1_7 ◽

1997 ◽

pp. 123-146

Author(s):

Zheng Mianping

Keyword(s):

Saline Lakes ◽

Salt Formation ◽

Material Sources

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A systematic examination of the relationships between CDOM and DOC in inland waters in China

10.5194/hess-2017-179 ◽

2017 ◽

Author(s):

Kaishan Song ◽

Ying Zhao ◽

Zhidan Wen ◽

Chong Fang ◽

Yingxin Shang

Keyword(s):

Organic Matter ◽

Saline Lakes ◽

Arid Regions ◽

Vital Role ◽

Inland Waters ◽

River Waters ◽

Remotely Sensed Imagery ◽

Lake Waters ◽

The Relationship

Abstract. Chromophoric dissolved organic matter (CDOM) plays a vital role in the biogeochemical cycle in aquatic ecosystems. The relationship between CDOM and dissolved organic carbon (DOC) has been investigated, and the significant relationship lays the foundation for the estimation of DOC using remotely sensed imagery data. An algorithm has been developed to retrieve DOC via CDOM absorption (aCDOM) at 275 and 295 nm for coastal waters, but it is still unclear for the relationship between DOC and aCDOM in other types of waters. The current study examined the samples from freshwater lakes, saline lakes, rivers and streams, urban water bodies, and ice-covered lakes in China. The regression model slopes for DOC versus aCDOM(275) ranged from extreme low 0.33 (highly saline lakes) to 1.03 (urban waters) and 3.13 (river waters). The low values were observed in saline lake waters and waters from semi-arid or arid regions where strong photo-bleaching is expected due to thin ozone layers, less cloud cover, longer water residence time and daylight hours. In contrast, high values were found in waters developed in wetlands or forest in Northeast China, where massive organic matter was transported from catchment to waters. The study also demonstrated that stronger relationships between CDOM and DOC were revealed when aCDOM(275) were sorted by the ratio of aCDOM(250) to aCDOM(365), which is a tracer for the CDOM absorption with respect to its composition, and the determination of coefficient of the regression models ranged from 0.78 to 0.99 for different groups of waters. Our results indicated the relationships between CDOM and DOC are variable for different inland waters, and therefore remote sensing models for DOC estimation through linking with CDOM absorption need to be tailored according to water types.

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