Modern pollen–vegetation and isopoll maps in southern Argentina

Paez, Marta M.; Schäbitz, Frank; Stutz, Silvina

doi:10.1046/j.1365-2699.2001.00616.x

Cited by 67 publications

(63 citation statements)

References 15 publications

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“…), Cupressaceae pollen percentages rose at all sites (>10%), suggesting a regional increase in Austrocedrus abundance. High percentages of Rhamnaceae (<8%) and Maytenus (<7%) at all sites indicate that the study area featured shrubland vegetation (22). CHAR values ranged from up to 20 particles per cm 2 ·y −1 at L. El Trébol, L. Huala Hué, and L. Mosquito to >0.8 particles per cm 2 ·y −1 in the remaining watersheds; spatial variations in abundance suggest relatively heterogeneous fire patterns at this time.…”

Section: Resultsmentioning

confidence: 86%

“…In the late glacial period (>16,000 cal years B.P. ), the pollen data from L. El Trébol and L. La Zeta indicate that steppe dominated by Poaceae (>32%), Asteraceae (<18%), and other steppe taxa (<38%) prevailed on the eastern flanks of the Andes (22). A charcoal accumulation rate (CHAR) <0.03 particles per cm 2 ·y −1 suggests negligible biomass burning at this time.…”

Section: Resultsmentioning

confidence: 98%

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Fire responses to postglacial climate change and human impact in northern Patagonia (41–43°S)

Iglesias

Whitlock

2014

Proc. Natl. Acad. Sci. U.S.A.

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Forest/steppe boundaries are among the most dynamic ecosystems on Earth and are highly vulnerable to changes in climate and land use. In this study we examine the postglacial history of the Patagonian forest/steppe ecotone (41-43°S) to better understand its sensitivity to past variations in climate, disturbance, and human activity before European colonization. We present regional trends in vegetation and biomass burning, as detected by generalized additive models fitted to seven pollen and charcoal records, and compare the results with other paleoenvironmental data, as well as archeological and ecological information to (i) estimate postglacial fire trends at regional scales, (ii) assess the evolution of climate-vegetation-fire linkages over the last 18,000 calibrated (cal) years B.P., and (iii) evaluate the role of humans in altering pre-European landscapes and fire regimes. Pollen and charcoal data indicate that biomass burning was relatively low during warm/dry steppe-dominated landscapes in the late glacial/Early Holocene transition and increased as more humid conditions favored forest development after ca. 10,000 cal years B.P. Postglacial fire activity was thus limited by fuel availability associated with sparse vegetation cover rather than by suitable climate conditions. In contrast to extensive burning by European settlers, variations in indigenous population densities were not associated with fluctuations in regional or watershed-scale fire occurrence, suggesting that climate-vegetation-fire linkages in northern Patagonia evolved with minimal or very localized human influences before European settlement.charcoal | fire | climate | anthropogenic impact | Patagonia

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 98%

Fire responses to postglacial climate change and human impact in northern Patagonia (41–43°S)

Iglesias

Whitlock

2014

Proc. Natl. Acad. Sci. U.S.A.

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“…Recent isopoll (equal pollen lines) maps of these three genera show that the distribution of their producers can be sharply delineated by the pollen spectrum 10 , probably because these trees produce pollen grains with limited pollen dispersal. Hence, we interpret the occurrence of these taxa as the most important elements of partially open woodland at some distance from the coast.…”

Section: Jmentioning

confidence: 99%

Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift

et al. 2014

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The Patagonian steppe-a massive rain-shadow on the lee side of the southern Andes-is assumed to have evolved B15-12 Myr as a consequence of the southern Andean uplift. However, fossil evidence supporting this assumption is limited. Here we quantitatively estimate climatic conditions and plant richness for the interval B10-6 Myr based on the study and bioclimatic analysis of terrestrially derived spore-pollen assemblages preserved in well-constrained Patagonian marine deposits. Our analyses indicate a mesothermal climate, with mean temperatures of the coldest quarter between 11.4°C and 16.9°C (presently B3.5°C) and annual precipitation rarely below 661 mm (presently B200 mm). Rarefied richness reveals a significantly more diverse flora during the late Miocene than today at the same latitude but comparable with that approximately 2,000 km further northeast at mid-latitudes on the Brazilian coast. We infer that the Patagonian desertification was not solely a consequence of the Andean uplift as previously insinuated.

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“…Todos ellos se localizan en el partido de Patagones (provincia de Buenos Aires), al sur del río Colorado, en el interfluvio entre las cuencas inferiores del río Colorado y el río Negro (Figura 1). Esta área se emplaza en una zona ecotonal, de transición pampeano-patagónica Páez et al 2001;Villamil y Scoffield 2003) y forma parte de la Diagonal Árida (Abraham de Vázquez et al 2000).…”

Section: Características Generales Del áRea De Estudio Y Estructura Dunclassified

Nuevos Contextos Funerarios en La Transición Pampeano-Patagónica Oriental (Pcia. De Buenos Aires, Argentina): Aportes Al Holoceno Medio Y Tardío Inicial

Martínez

Flensborg

2018

Chungará (Arica)

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Este trabajo tiene como objetivo principal caracterizar el registro bioarqueológico y el contexto (estratigrafía y cronología) de cuatro nuevos sitios arqueológicos localizados en el área de transición pampeano-patagónica oriental adscritos al Holoceno Medio y Tardío inicial (ca. 6.000-1.000 años AP). Se propone evaluar y discutir las variaciones en las prácticas mortuorias y en el uso del espacio (costa-interior) por parte de grupos cazadores-recolectores. Se presentan los resultados de las modalidades de entierro, análisis cuantitativos, tafonómicos, y sexo-etarios. En los sitios localizados en el interior los restos están muy fragmentados y afectados por importantes factores tafonómicos (e.g., meteorización, abrasión sedimentaria), mientras que en el sector costero, la completitud anatómica es mayor, y los resultados tafonómicos indican estabilidad en la historia depositacional. La modalidad de entierro en los sitios costeros durante el Holoceno Medio habría sido primaria, en tanto ésta no pudo ser determinada en el interior. Por su parte, para el Holoceno Tardío inicial, mientras en la costa se registraron inhumaciones primarias, en el interior se observaron modalidades secundarias. La cronología obtenida indica la reocupación sistemática durante el Holoceno Medio y Tardío inicial tanto de los sectores costeros como interiores. Finalmente, los resultados se integran con la información cronológica obtenida sobre restos óseos humanos y las modalidades de entierro definidas para el sudeste Pampeano y Norpatagonia con el fin de discutir la contribución del caso de estudio a la bioarqueología de dichas regiones.Palabras claves: Pampa-Patagonia, Holoceno Medio-Tardío inicial, cazadores-recolectores, prácticas mortuorias, tafonomía, costa-interior. The purpose of this work is to characterize the bioarchaeological record and the contexts (stratigraphy and chronology) of recently recorded Middle and initial Late Holocene archaeological sites located in the eastern

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Modern pollen–vegetation and isopoll maps in southern Argentina

Cited by 67 publications

References 15 publications

Fire responses to postglacial climate change and human impact in northern Patagonia (41–43°S)

Fire responses to postglacial climate change and human impact in northern Patagonia (41–43°S)

Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift

Nuevos Contextos Funerarios en La Transición Pampeano-Patagónica Oriental (Pcia. De Buenos Aires, Argentina): Aportes Al Holoceno Medio Y Tardío Inicial

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