Paleolimnological record of the Pampean plains (Argentina) as a natural archive of South American hydroclimatic variability since the LGM to the Current Warm Period

Cuña-Rodríguez, Carolina; Piovano, Eduardo L.; García-Rodríguez, Felipe; Sylvestre, Florence; Rostek, Frauke; Bernasconi, Stefano M.; Ariztegui, Daniel

doi:10.1016/j.quascirev.2020.106675

Cited by 19 publications

(3 citation statements)

References 149 publications

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“…Paleolimnological records from the Northern and Western Pampas, like Salinas del Bebedero (33°34′S, 66°40′W) and Laguna Mar Chiquita (30°40′S, 62°35′W) revealed high lake level stands around 12.6 cal ka bp (Rojo et al ., 2012) and between ca. 13.5 and 10.5 cal ka bp (Cuña‐Rodríguez et al ., 2020), respectively. The latter authors propose as the main trigger of this wet period in Mar Chiquita a strengthening of the SASM (Stríkis et al ., 2015), a phenomenon which might have also forced glacier advance of the eastern flank of the southern Central Andes (D'Arcy et al ., 2019).…”

Section: Discussionmentioning

confidence: 98%

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Tripaldi,

Ozán,

Heider

et al. 2024

J Quaternary Science

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Stabilized and active dunes and sand sheet deposits abound in a small lake‐dotted semi‐arid region of the Western Pampean Dunefield, Argentina. Here, a multi‐scale and multi‐proxy study of three sites, across a hydrologic gradient from lakes to a dryland with groundwater levels at more than 25 m depth, analyzes calcareous and ferruginous rhizoliths, calcareous crusts, hypocoatings, pedogenic carbonate and amorphous Mn‐oxide precipitates within blowout dunes. These palustrine‐related features indicate significantly wetter conditions that allowed the development of shallow lakes and expanding wetlands during the Pleistocene–Holocene transition, limited by associated optically stimulated luminescence ages between ca. 14.7 and 11.6 ka. These wetter conditions, also identified in other nearby proxy records, may be associated with a strengthened South American Monsoon System, potentially during the Younger Dryas Chronozone, though other geological, ecological and climatic forcings cannot be ruled out with available data. Such a scenario lacks a modern analogue, since current hydrologic excess, evidenced in the formation of lakes and new rivers, is not observed in the localities which record paleolakes. This study underlines the variable conditions for pronounced hydrologic excess in semi‐arid eolian environments in western Argentina with complex ecological, anthropogenic and climatic linkages.

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Section: Discussionmentioning

confidence: 98%

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Tripaldi,

Ozán,

Heider

et al. 2024

J Quaternary Science

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“…Furthermore, seasonal changes, albeit rarely traceable in the past, can shed light on the potential effects on guanacos’ diet of larger scale climatic phenomena in the past (e.g. Cuña-Rodríguez et al, 2020; Mignino et al, 2018; Piovano et al, 2009 Yanes et al, 2014).…”

Section: Habitat Ecology and Diet Of Lama Guanicoementioning

confidence: 99%

Assessing the diet of modern and archaeological guanacos from the Great Chaco in Córdoba, Argentina, through stable isotope analysis (δ¹³C, δ¹⁵N) of bone and dentin collagen: Implications for paleoenvironmental and zooarchaeological studies

Weihmüller,

Izeta,

Sharpe

et al. 2024

The Holocene

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The application of stable isotope analyses allows a diachronic characterisation of species habitat and feeding behaviour, information of utmost importance for zooarchaeological research. In South America, the former distribution of the guanaco ( Lama guanicoe) encompassed a much larger territory than the current one. Within the Argentinean Great Chaco, only a small native population persists in Northwestern Córdoba province, Central Argentina, where it was once widely distributed. In this paper, we present the first set of dentin and collagen δ13C and δ15N values for this relict population ( N = 18) along with archaeological data of guanaco specimens ( N = 19) dated to the Middle and Late Holocene from the nearby Ongamira valley. Neither deciduous and permanent teeth nor males and females show marked differences within the modern samples. Both modern and archaeological guanaco δ13C values indicate a mixed diet of C3 and, to a lesser extent, C4 plants. Conversely, the δ15N values exhibit distinct signals between the Arid and the Mountain Chaco subregions. The diet breadth of the archaeological guanacos suggests the use of transitional or ecotonal environments, also reflected in the size of their isotopic niche as opposed to modern guanacos. Regarding the timing of the species retraction in the region, there is no evidence of a shift in its habitat during the period between ~4700 and 190014C years BP. We suggest their retraction probably occurred later than previously proposed in regional zooarchaeological models.

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“…Roberto Urrutia of the University of Concepción (Centro de Ciencias Ambientales, EULA, Chile) and Dr. Felipe Daniel García-Rodríguez of the Universidad de la República de Uruguay (UdelaR) are influential South American researchers in this field. In collaboration with fellow researchers, they have made significant contributions to various areas, including water quality (GARCÍA-RODRÍGUEZ et al 2022, RODRÍGUEZ-LÓPEZ et al 2022), climate variability (URRUTIA et al 2010, CUÑA-RODRÍGUEZ et al 2020, GARCÍA-RODRÍGUEZ et al 2021, GARCÍA et al 2022, biodiversity ( VAN DE VYVER et al 2022), and other topics. This region is actively producing other prominent researchers, who have made remarkable advancements in this field.…”

Section: Collaboration Network In Diatom-based Paleoenvironmental Res...mentioning

confidence: 99%

Diatom-based paleoenvironmental research: global trends, regional disparities and the evolving role of South America

Fontana,

Novaes de Nascimento

2023

Derb.

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The use of diatoms in paleoenvironmental research is of the utmost importance for reconstructing past ecosystems because it provides crucial insights into the adaptability and resilience of these systems under ongoing climate change and increased human impacts. Maintaining a comprehensive dataset distribution is crucial to ensure the validity and relevance of these reconstructions on a global scale. This scientometric study aimed to analyze trends in diatom-based paleoenvironmental research on a global scale with an emphasis on South America. This study aimed to investigate disparities in the geographical distribution of diatom-based paleoenvironmental studies, collaboration networks in the field, and regions in which this research is lacking. The Scopus search criteria excluded certain types of publications, such as conference articles and notes. The search focused on articles, reviews, books and chapters of books using specific keywords aligned with the objectives of this study. Using the Scopus database, we identified 7,091 publications (1979-2023) that employed diatoms as a primary proxy for paleoenvironmental reconstruction. The results show significant changes in this field recent decades. The analysis highlights a marked upsurge in publication output during the 1980s and a substantial increase in publications after 2000. This upward trend in scientific documentation reflects the growing interest in and recognition of the importance of this field in the context of palaeoecology and environmental sciences. After 2011, the results revealed a shift in thematic focus from historical and geological reconstruction to ecological, anthropogenic, and climatic interactions. Key researchers, including Smol JP, Leng MJ, and Birks HJB, have been at the forefront of international collaborations. Since the 2000s, South American studies have focused primarily on lakes, climate change effects, and volcanic activity. In this region, researchers such as Maidana N.I., Urrutia, R., and García-Rodriguez, F. emphasized the significance of regional ecosystems and their paleoenvironmental history in the global context of the field. Despite its high biodiversity, South America contributed only 6.7% of the global research output, placing it 19th globally. Socioeconomic factors and other obstacles faced by researchers in the region could explain the observed disparity in scientific output in South America compared to other regions. To unlock South America’s vast potential for diatom-based paleoenvironmental research, which boasts the highest global biodiversity yet remains underrepresented in the field, stakeholders must implement equitable partnerships, increase funding and improve their academic infrastructure and opportunities. These strategies are crucial for advancing the global paleoenvironmental understanding, informing future conservation and environmental policies in South America, and promoting scientific progress on a global scale.

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Paleolimnological record of the Pampean plains (Argentina) as a natural archive of South American hydroclimatic variability since the LGM to the Current Warm Period

Cited by 19 publications

References 149 publications

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Assessing the diet of modern and archaeological guanacos from the Great Chaco in Córdoba, Argentina, through stable isotope analysis (δ¹³C, δ¹⁵N) of bone and dentin collagen: Implications for paleoenvironmental and zooarchaeological studies

Diatom-based paleoenvironmental research: global trends, regional disparities and the evolving role of South America

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Paleolimnological record of the Pampean plains (Argentina) as a natural archive of South American hydroclimatic variability since the LGM to the Current Warm Period

Cited by 19 publications

References 149 publications

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Where did the water come from? Wetlands and shallow lakes in semi‐arid dunefields from South America during the Pleistocene–Holocene transition

Assessing the diet of modern and archaeological guanacos from the Great Chaco in Córdoba, Argentina, through stable isotope analysis (δ13C, δ15N) of bone and dentin collagen: Implications for paleoenvironmental and zooarchaeological studies

Diatom-based paleoenvironmental research: global trends, regional disparities and the evolving role of South America

Contact Info

Product

Resources

About

Assessing the diet of modern and archaeological guanacos from the Great Chaco in Córdoba, Argentina, through stable isotope analysis (δ¹³C, δ¹⁵N) of bone and dentin collagen: Implications for paleoenvironmental and zooarchaeological studies