Ecology of freshwater ostracods from Northern Patagonia and their potential application in paleo-environmental reconstructions

Coviaga, Corina Anabel; Cusminsky, Gabriela Catalina; Pérez, Patricia

doi:10.1007/s10750-017-3127-1

Cited by 26 publications

(50 citation statements)

References 53 publications

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“…This taxon presents one of the widest ranges in salinity tolerance, supporting its ability to develop within a broad spectrum of limnological conditions (Coviaga et al, 2018a;Cusminsky et al, 2005;D'Ambrosio et al, 2015;Ramón-Mercau et al, 2012;Schwalb et al, 2002). Ilyocypris ramirezi is widespread in Patagonia, but exhibits a notably preference for lotic environments, being almost exclusively found in flowing waters (Coviaga et al, 2018a;Cusminsky et al, 2005;Schwalb et al, 2002). Analogously, the increase in sedimentary density and magnetic susceptibility in the upper levels of CLG-Z1 could be a consequence of runoff intensification, resulting from higher precipitation (Iglesias et al, 2011;Sepúlveda et al, 2009).…”

Section: Paleolimnological Reconstructionmentioning

confidence: 94%

Paleoenvironmental changes during the last 3000 years in Lake Cari-Laufquen (Northern Patagonia, Argentina), inferred from ostracod paleoecology, petrophysical, sedimentological and geochemical data

et al. 2018

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South American paleoreconstructions are of global interest because it is the only landmass extending from the tropics to the southern high latitudes and intersecting the entire southern westerly wind belt. In this context, endorheic environments, as Lake Cari-Laufquen Grande (LCLG; 41º35'S, 69º25'W) are excellent sites for paleoenvironmental studies, since they react rapidly to changes in the precipitation/evaporation ratio. In this study, the limnological conditions prevailing during the last 3000 years have been inferred based on a multiproxy analysis of the sedimentary sequence of LCLG (water depth 4 m, core length 505 cm). Today, this is one of the few lakes in Northern Patagonia, providing a unique paleoclimatic and paleoecological lacustrine record. The ostracod assemblages, along with sedimentological, petrophysical and geochemical data, show hydrological changes in Cari-Lauquen Grande basin during the studied period. Our results indicate the continuous presence of a saline to brackish lake. However, changes in ostracod assemblages and sedimentological features reveal variations in the relative salinity of the system. The lake paleosalinity was estimated based on ostracod salinity optima, using a calibration dataset of 29 species and 72 different environments. Intervals of high salinity (24-26 g L-1) were dominated by L. rionegroensis (morph.I) and organic-poor sediments. Periods of lower salinity (14-20 g L-1) favored the occurrence of oligo-mesohaline taxa, such as R. whatleyi, L. rionegroensis (morph.III), Cypridopsis sp., L. patagonica and I. ramirezi. The sediments further display higher values of both TOC and magnetic susceptibility. These salinity changes are interpreted as water level variations, associated in turn to cold-wet and warm-dry periods in northern Patagonia. Our results provide new insights into the late-Holocene environmental history of the region, characterized by a paucity of records. In addition, the ostracod paleoecology modeled using a WA approach allowed quantitative inferences of salinity changes, highlighting their potential in Quaternary paleoclimate research.

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Section: Paleolimnological Reconstructionmentioning

confidence: 94%

Paleoenvironmental changes during the last 3000 years in Lake Cari-Laufquen (Northern Patagonia, Argentina), inferred from ostracod paleoecology, petrophysical, sedimentological and geochemical data

et al. 2018

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“…; Ramón‐Mercau & Laprida ; Coviaga et al . ). Therefore, this switch in ostracod assemblages indicates that these biozones can be considered as a transitional period between the cold and dry Late Pleistocene and the warm and humid Early Holocene.…”

Section: Discussionmentioning

confidence: 97%

“…() and Coviaga et al . (), a palaeosalinity reconstruction (g L −1 ) was performed using a weighted averaging transfer function (C2 software, Juggins ). Reconstructed conductivity (μS cm −1 ) values were transformed to salinity (g L −1 ) using the following conversion estimated by Marco‐Barba et al .…”

Section: Methodsmentioning

confidence: 99%

“…In order to define local ostracod assemblage zones, a constrained cluster analysis was carried out using the Bray-Curtis index and unweighted pair group mean average method performed using PAST v. 2.17 (Hammer et al 2001). Based on the modern ostracod data sets published in Cusminsky et al (2005), Ramos et al (2017) and Coviaga et al (2018a), a palaeosalinity reconstruction (g L À1 ) was performed using aweighted averaging transfer function (C2 software, Juggins 2003). Reconstructed conductivity(lScm À1 )valuesweretransformedtosalinity (g L À1 ) using the following conversion estimated by Marco-Barba et al (2013): salinity (g L À1 ) = (0.000701 9 conductivity (lS cm À1 )) À 0.060988.…”

Section: Ostracod Assemblagesmentioning

confidence: 99%

“…; Coviaga et al . ). Furthermore, the morphological variability between populations of two widely distributed species, Eucypris fontana (Graf, 1931) and Limnocythere rionegroensis Cusminsky & Whatley, , was determined, allowing further exploration of the relationship between morphological patterns and ecological variables (Ramos et al .…”

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confidence: 97%

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Changes in ostracod assemblages and morphologies during lake‐level variations of Lago Cardiel (49°S), Patagonia, Argentina, over the last 15.6 ka

Ramos

Alperín

Schwalb

et al. 2019

Boreas

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Changes in the ostracod assemblages from two sediment cores collected from Lago Cardiel in southeastern Patagonia (49°S) reflect the main regional abrupt climatic changes over the last 15.6 cal. ka BP. Shifts in species abundance and switches in dominances suggest that these were mainly driven by variable salinity. During the Late Pleistocene, Limnocythere rionegroensis was abundant and dominant, indicating waters with high salinity and prevalence of evaporative processes. Between 12.6 and 10.8 cal. ka BP, Lago Cardiel expanded markedly and reached an Early Holocene highstand of +55 m above present lake level. A major change in ostracod assemblage in which Limnocythere patagonica appears as the dominant species in parallel with the disappearance of L. rionegroensis and Eucypris aff. cecryphalium mirrored this transitional period between the cold and dry Late Pleistocene and the humid and warm Early Holocene. Over the last 4 cal. ka BP, L. rionegroensis returned to the species assemblage and Riocypris whatleyi increased its abundance pointing towards increasing salinities. The variations in size, shape and ornamentation of L. rionegroensis and R. whatleyi fossil valves were examined using geometric morphometric techniques and further compared to those of modern Patagonian sites. Limnocythere rionegroensis specimens displayed high morphological variability during the evolution of Lago Cardiel. More specifically, the switch in reproductive mode – from sexual to parthenogenetic– and the increase in valve ornamentation around 12.7 cal. ka BP suggest that these changes were promoted by the hydrological alteration that occurred in the Late Pleistocene. This exercise provides a robust range of morphological variation for these proxies, which will be useful in further taxonomic and palaeoenvironmental studies adding more information about different factors influencing the observed morphological trends.

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Patagonian Wetlands: Vertientes, Vegas, Mallines, Turberas, and Lagunas

Epele

Mazzoni

Iturraspe

et al. 2022

Natural and Social Sciences of Patagonia

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Ecology of freshwater ostracods from Northern Patagonia and their potential application in paleo-environmental reconstructions

Cited by 26 publications

References 53 publications

Paleoenvironmental changes during the last 3000 years in Lake Cari-Laufquen (Northern Patagonia, Argentina), inferred from ostracod paleoecology, petrophysical, sedimentological and geochemical data

Paleoenvironmental changes during the last 3000 years in Lake Cari-Laufquen (Northern Patagonia, Argentina), inferred from ostracod paleoecology, petrophysical, sedimentological and geochemical data

Changes in ostracod assemblages and morphologies during lake‐level variations of Lago Cardiel (49°S), Patagonia, Argentina, over the last 15.6 ka

Patagonian Wetlands: Vertientes, Vegas, Mallines, Turberas, and Lagunas

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