Palaeoenvironmental change in Southern Patagonia during the Lateglacial and Holocene: Implications for forest refugia and climate reconstructions

Mansilla, Claudia A; McCulloch, Robert; Morello, Flavia

doi:10.1016/j.palaeo.2016.01.041

Cited by 32 publications

(31 citation statements)

References 49 publications

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“…8). This inference is consistent with other recently published data: Boyd et al (2008) radiocarbon data indicate marine conditions in south Seno Almirantazgo by 15.5 ka, Hall et al (2013) report deglaciation ages of~16.4-16.8 ka from low elevation peat bogs along the west coast of Seno Almirantazgo, Mansilla et al (2016) shows that an area at 51 masl near Puerto Yartou, in the eastern coast of Whiteside Channel (Fig. 1), was deglaciated at least by~18 ka, and Darvill et al (2015) proposes in a geomorphological study that limit 'D', 'C' and 'B' erratic boulders belong to the same glacial event, which would imply that limit 'D' corresponds to the waning stage of the LGM.…”

Section: Significance For the Recent Glacial History Of Magallanessupporting

confidence: 93%

“…We infer that to meet these conditions the regional climate had to be cold and humid in order to keep a low elevation equilibrium line altitude (ELA). The presumption of a relatively cold climate in the Magallanes Region during the ACR is consistent with pollen records from the area that show a dominance of steppe tundra taxa (McCulloch and Davies, 2001;Markgraf and Huber, 2010;Mansilla et al, 2016), however is not observed in sea surface temperature from offshore records (53 S; Caniupan et al, 2011). Increasing humidity in the region during the time of the ACR is supported by a steady increase in Nothofagus in the pollen record from Punta Yartou ( Fig.…”

Section: Significance For the Recent Glacial History Of Magallanessupporting

confidence: 83%

“…Increasing humidity in the region during the time of the ACR is supported by a steady increase in Nothofagus in the pollen record from Punta Yartou ( Fig. 1; Mansilla et al, 2016), however, this pattern is not observed in other sites (Kilian and Lamy, 2012). Thus the available climate records in the Magallanes Region do not unambiguously support the cold and humid conditions required for an extensive glacial advance at the time of the ACR in the Estrecho de Magallanes area.…”

Section: Significance For the Recent Glacial History Of Magallanesmentioning

confidence: 90%

“…Location of marine sediment cores from Aracena et al (2015) and Boyd et al (2008) are indicated by red circles. Peat bog core in Punta Yartou (Mansilla et al, 2016) is indicated by a blue circle. seismic stratigraphic framework which prevents the contextualization of their stratigraphic and paleoenvironmental findings.…”

Section: Introductionmentioning

confidence: 99%

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Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America

et al. 2017

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We present results of a marine geophysical survey that imaged submarine sedimentary and geomorphic features of the main inland channels of the Magallanes Region of Chile, in southernmost South America. This region holds a remarkable terrestrial and marine record of glacial variations in the closest landmass to Antarctica. We report evidence for grounded ice along the main channels associated with two ice lobes that flowed from Cordillera Darwin, part of the Austral Andes, into Central Estrecho de Magallanes and Seno Almirantazgo. Multibeam data show drumlins and glacial lineations in Whiteside Channel the northern continuation of Seno Almirantazgo, and iceberg plough marks in Central Estrecho de Magallanes. Multichannel seismic data show a complex array of seismic facies, interpreted as representing two main types of sedimentary units: glacimarine sediments, corresponding to glacial periods, and pelagic sediments, corresponding to interglacial periods. We find that there are two interglacial-glacial cycles represented in this marine sedimentary record. Chronologically: 1) the youngest glacial unit corresponds to the last regional glaciation (~31-18 ka); 2) these passageways deglaciated with the retreat from regional glacial limit 'D' (~17-18 ka), and 3) there is no marine sedimentary or morphological evidence that the Magallanes glaciers readvanced into the main passageways during the Antarctic Cold Reversal (~14-13 ka). These findings suggest that final deglaciation of southernmost South America was driven by the atmospheric and ocean warming that started~18 ka as recorded in Antarctic ice core records and sea surface temperature proxies offshore the Magallanes Region.

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Section: Significance For the Recent Glacial History Of Magallanessupporting

confidence: 93%

Section: Significance For the Recent Glacial History Of Magallanessupporting

confidence: 83%

Section: Significance For the Recent Glacial History Of Magallanesmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America

et al. 2017

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“…a BP has been reported from Punta Yartou (53°51′S, 70°08′W), located in the western of Tierra del Fuego, next to the Magellan Straits (Mansilla et al . ). We also note that modern surface samples from the Beagle Channel hold peridiniod cysts of Pentapharsodinium dalei .…”

Section: Discussionmentioning

confidence: 97%

Early to middle Holocene palaeoenvironmental reconstruction of the Beagle Channel (southernmost Argentina) based on terrestrial and marine palynomorphs

Candel

Borromei

Louwye

2018

Boreas

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This paper presents the main palaeoenvironmental results obtained from a site located in the western sector of the Beagle Channel, Isla Grande de Tierra del Fuego, southernmost Argentina. The palynological analysis performed on marine sediments from Aserradero‐Lapataia 2 (latitude 54°51′22.7″S, longitude 68°34′22.8″W) allowed us to document the evolution of palaeoenvironmental conditions during the beginning of the Holocene marine transgression into the Beagle Channel. The results indicate that, prior to the marine incursion, the coastal areas were characterized by the presence of open‐grown shrubs and herbs along with woodland palaeocommunities. The aquatic environments were dominated exclusively by freshwater taxa. Around 8300 cal. a BP, seawater gradually flooded the channel while cold and high effective moisture conditions favoured the development of an arboreal vegetation with dominance of Nothofagus forest and scarcity of shrub and herbaceous communities. Gradually increasing salinities allowed the development of freshwater/marine transitional environments indicated by aquatic palynomorphs able to tolerate stressed conditions under fluctuating salinities. The increasing dinocyst diversification with dominance of heterotrophic taxa corroborates the establishment of a fully marine environment during the middle–late Holocene in the Beagle Channel.

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Evaluating population histories in Patagonia and Tierra del Fuego, Chile, using ancient mitochondrial and Y‐chromosomal DNA

Balentine

Alfonso‐Durruty

Reynolds

et al. 2022

American Journal of Biological Anthropology

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Objectives: This study aims to characterize the genetic histories of ancient hunter-gatherer groups in Fuego-Patagonia (Chile) with distinct Marine, Terrestrial, and Mixed Economy subsistence strategies. Mitochondrial (mtDNA) and Y-chromosome data were generated to test three hypotheses. H 0 : All individuals were drawn from the same panmictic population; H 1 : Terrestrial groups first populated the region and gave rise to highly specialized Marine groups by $7,500 cal BP; or H 2 : Marine and Terrestrial groups represent distinct ancestral lineages who migrated independently into the region. Methods: Ancient DNA was extracted from the teeth of 50 Fuegian-Patagonian individuals dating from 6,895 cal BP to after European arrival, and analyzed alongside other individuals from previous studies. Individuals were assigned to Marine, Terrestrial, and Mixed Economy groups based on archeological context and stable isotope diet inferences, and mtDNA (HVR1/2) and Y-chromosome variation was analyzed.

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Palaeoenvironmental change in Southern Patagonia during the Lateglacial and Holocene: Implications for forest refugia and climate reconstructions

Cited by 32 publications

References 49 publications

Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America

Seismic stratigraphy and glacial cycles in the inland passages of the Magallanes Region of Chile, southernmost South America

Early to middle Holocene palaeoenvironmental reconstruction of the Beagle Channel (southernmost Argentina) based on terrestrial and marine palynomorphs

Evaluating population histories in Patagonia and Tierra del Fuego, Chile, using ancient mitochondrial and Y‐chromosomal DNA

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