Vegetation dynamics from Lago San Martín area (Southwest Patagonia, Argentina) during the last 6,500 years

Bamonte, Florencia Paula; Mancini, María Virginia; Sottile, Gonzalo David; Marcos, Maria Alejandra; Gogorza, Claudia

doi:10.1007/s00334-014-0473-z

Cited by 11 publications

(18 citation statements)

References 38 publications

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“…We constructed past pollen-based paleohydric balance indices. Main pollen taxa were considered suggesting above/below hydric availability at every site, following paleoecological and modern pollen-vegetation calibrations highlighted on previous published works ( Bamonte and Mancini, 2011;Bamonte et al, 2014;Bianchi and Ariztegui, 2012;Echeverria et al, 2014;Iglesias, 2013;Iglesias et al, 2012Mancini, 2007Mancini, , 2009Mancini et al, 2012;Marcos and Mancini, 2012;Marcos et al, 2012a;Paez et al, 2001;Sottile et al, 2012;Sottile, 2014). Each paleohydric balance was calculated as the standardized ratio between the sum (in percentages) of positive hydric availability taxa and the sum of negative hydric availability taxa (see Supplement, Sect.…”

Section: Methodsmentioning

confidence: 99%

“…Moy et al (2009) and Kilian and Lamy (2012) suggest that the different signal shown in these data set could be attributed to the location of the records in different ecological environments; the depositional environment, and local differences in the sensitivity of eastern Andean vegetation ecotones to changes in precipitation. Since 2009, new pollen and charcoal records from bog and lakes in northern and southern Patagonia at the east side of the Andes have been published with an adequate calibration of pollen assemblages related to modern vegetation and ecological behaviour (Bamonte and Mancini, 2011;Bamonte et al, 2014;Echeverria et al, 2014;Iglesias, 2013;Iglesias et al, 2012Mancini, 2009;Marcos et al, 2012a, b;Sottile et al, 2012;Sottile, 2014). In this work we improve the chronological control of some eastern Andean previously published sequences and integrate pollen and charcoal dataset available east of the Andes to interpret possible environmental and SWW variability at centennial time scales.…”

Section: Introductionmentioning

confidence: 99%

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Eastern Andean environmental and climate synthesis for the last 2000 years BP from terrestrial pollen and charcoal records of Patagonia

Sottile

Echeverria

Mancini

et al. 2015

Preprint

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Abstract. The Southern Hemisphere Westerly Winds (SWW) constitute an important zonal circulation system that dominates the dynamics of Southern Hemisphere mid-latitude climate. Little is known about climatic changes in the Southern South America in comparison to the Northern Hemisphere due to the low density of proxy records, and adequate chronology and sampling resolution to address environmental changes of the last 2000 years. Since 2009, new pollen and charcoal records from bog and lakes in northern and southern Patagonia at the east side of the Andes have been published with an adequate calibration of pollen assemblages related to modern vegetation and ecological behaviour. In this work we improve the chronological control of some eastern Andean previously published sequences and integrate pollen and charcoal dataset available east of the Andes to interpret possible environmental and SWW variability at centennial time scales. Through the analysis of modern and past hydric balance dynamics we compare these scenarios with other western Andean SWW sensitive proxy records for the last 2000 years. Due to the distinct precipitation regimes that exist between Northern (40–45° S) and Southern Patagonia (48–52° S) pollen sites locations, shifts on latitudinal and strength of the SWW results in large changes on hydric availability on forest and steppe communities. Therefore, we can interpret fossil pollen dataset as changes on paleohydric balance at every single site by the construction of paleohydric indices and comparison to charcoal records during the last 2000 cal yrs BP. Our composite pollen-based Northern and Southern Patagonia indices can be interpreted as changes in latitudinal variation and intensity of the SWW respectively. Dataset integration suggest poleward SWW between 2000 and 750 cal yrs BP and northward-weaker SWW during the Little Ice Age (750–200 cal yrs BP). These SWW variations are synchronous to Patagonian fire activity major shifts. We found an in phase fire regime (in terms of timing of biomass burning) between northern Patagonia Monte shrubland and Southern Patagonia steppe environments. Conversely, there is an antiphase fire regime between Northern and Southern Patagonia forest and forest-steppe ecotone environments. SWW variability may be associated to ENSO variability especially during the last millennia. For the last 200 cal yrs BP we can concluded that the SWW belt were more intense and poleward than the previous interval. Our composite pollen-based SWW indices show the potential of pollen dataset integration to improve the understanding of paleohydric variability especially for the last 2000 millennial in Patagonia.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eastern Andean environmental and climate synthesis for the last 2000 years BP from terrestrial pollen and charcoal records of Patagonia

Sottile

Echeverria

Mancini

et al. 2015

Preprint

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“…Todas las muestras fósiles exhiben una clara asociación con las muestras actuales que representan a la estepa graminosa. Si se consideran las inferencias ambientales postuladas para el sitio, el mismo representa el Holoceno tardío (Bamonte et al 2013) cuya vegetación estaba representada por una estepa graminosa similar a la actual según lo inferido a partir de las secuencias continuas (Bamonte y Mancini 2011;Bamonte et al 2015).…”

Section: Relación Entre La Representación Espacial De Los Conjuntos Punclassified

“…1-Chorrillo Malo 2 (Mancini 2002); 2-El Sosiego 4 (Mancini 2002), 3-Cerro Verlika (Mancini 2002); 4-Charles Fuhr 2 (Mancini 1998); 5-Área Parque Nacional Perito Moreno (CCP7, CCP5, ADO, ADG, Mancini et al 2002, Mancini 2007; 6-Área Lago San Martín (CPD, B1Oq, Bamonte et al 2013); 7-Área Lago Pueyrredón (CMN1, CMN2, COCU, Horta et al 2016Horta et al , 2019; 8-Alero Cárdenas (Mancini y Trivi de Mandri 1994); 9-La Gruta 1 (Mancini et al 2013;Brook et al 2013); 10-La Martita (Mancini 1998); 11-La María (de Porras 2010, de Porras et al 2011; 12-Los Toldos (de Porras 2010, de Porras et al 2011Prieto et al 2018); 13-Piedra Museo (Borromei 2003, Mancini et al 2013; 14-Cabo Vírgenes y Cueva Cóndor (Mancini 2007, Mancini y Graham 2014. Las áreas de los lagos San Martín y Argentino presentan depósitos continuos que complementaron la información paleoambiental (Bamonte y Mancini 2011, Bamonte et al 2015, Mancini 2009. En el mapa de Santa Cruz se representan con el punto rojo la ubicación geográfica de cada sitio arqueológico utilizado.…”

Section: Relación Entre La Representación Espacial De Los Conjuntos Punclassified

“…Por ejemplo, en el sitio B1Oq, Bamonte et al(2013) discuten que el registro fósil refleja variaciones locales de la vegetación, principalmente de aquella asociada a las laderas rocosas que la rodean. En cambio, el análisis de la secuencia de la CPD, brindó información a mesoescala similar a la obtenida de la secuencia Mallín La Tercera y Mallín Paisano Desconocido (Bamonte yMancini 2011;Bamonte et al 2015). Situaciones similares en las escalas espaciales de análisis brindan los sitios arqueológicos COCU y CMN1 respectivamente, para el área del Lago Pueyrredón.…”

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Utilización de datos polínicos en sitios arqueológicos de Patagonia: metodologías estadísticas, alcances y límites interpretativos

Marcos¹,

Bamonte²,

Mancini³

2020

Come

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Los sitios arqueológicos presentes en Santa Cruz han brindado importante información sobre los cambios de la vegetación y del clima en diferentes escalas espaciales y temporales. En este trabajo presentamos ejemplos metodológicos para analizar los datos polínicos actuales y del registro fósil de cuatro secuencias arqueológicas (CMN1 y COCU a los 47°S; 71°O y B1Oq y CPD a los 49°S; 72°O) ubicadas al oeste de Santa Cruz. A partir de estos resultados se discuten los alcances y los límites interpretativos de los datos utilizados. Nuestros resultados indican que los análisis polínicos actuales han permitido diferenciar con significancia estadística las unidades de vegetación a escala local y regional para ambas áreas. Las secuencias estudiadas han permitido estimar la representación espacial de los registros fósiles mediante un análisis de correspondencia destendenciado. CMN1 y CPD reflejan cambios en la vegetación a mesoescala y a escala regional verificables con otras secuencias continuas de lagos y mallines (47°-49º; 50°S), mientras que COCU y B1Oq indican una señal local de la vegetación. Si bien debe considerarse cuidadosamente el alcance de los datos para abordar la pregunta paleoambiental, las secuencias arqueológicas brindan valiosa información y son muy importantes en aquellos ambientes donde no hay disponibilidad de secuencias naturales continuas (como lagos, mallines, lagunas). En este trabajo concluimos que los análisis estadísticos son una herramienta importante que complementan nuestros análisis. Además, es necesario conocer las particularidades de las áreas de estudio, la vegetación circundante, su geomorfología, y la representación espacial de los registros actuales y fósiles para reflejar con mayor fidelidad los estudios polínicos.

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Changes in vegetation and human-environment interactions during the Holocene in the Lake Pueyrredón area (Southern Patagonia)

Marcos

Bamonte

Echeverria

et al. 2021

Veget Hist Archaeobot

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Vegetation dynamics from Lago San Martín area (Southwest Patagonia, Argentina) during the last 6,500 years

Cited by 11 publications

References 38 publications

Eastern Andean environmental and climate synthesis for the last 2000 years BP from terrestrial pollen and charcoal records of Patagonia

Eastern Andean environmental and climate synthesis for the last 2000 years BP from terrestrial pollen and charcoal records of Patagonia

Utilización de datos polínicos en sitios arqueológicos de Patagonia: metodologías estadísticas, alcances y límites interpretativos

Changes in vegetation and human-environment interactions during the Holocene in the Lake Pueyrredón area (Southern Patagonia)

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