Changing scenarios in Bajo de la Quinta (San Matías Gulf, Northern Patagonia, Argentina): Impact of geomorphologic processes in subsistence and human use of coastal habitats

Favier-Dubois, Cristian M.; Kokot, Roberto Roque

doi:10.1016/j.quaint.2011.03.051

Cited by 46 publications

(44 citation statements)

References 9 publications

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“…Most of the samples analyzed here came from archaeological sites and the oldest skeletal remains of South American sea lions from southern Patagonia are 1000 years younger than the oldest evidence of human exploitation of the marine resources in the area (Orquera and Piana 1988, 1999; Orquera et al 2011; Tivoli and Zangrando 2011). Likewise, the oldest skeletal remains of South American sea lions from northern-central Patagonia are 3000 years younger than the oldest archaeological evidence of the exploitation of fishes, marine birds, and crustaceans in the area (Favier Dubois et al 2009; Favier Dubois and Kokot 2011; Favier Dubois and Scartascini 2012; Gómez Otero et al 2013). Whether such previous exploitation had modified the trophic niche of South American sea lions remains unknown and can be answered only if paleontological sites predating the arrival of humans were discovered.…”

Section: Discussionmentioning

confidence: 99%

“…Bones of some fish species are abundant in the zooarchaeological record of both northern-central and southern Patagonia (Favier Dubois et al 2009: Favier Dubois and Kokot 2011; Favier Dubois and Scartascini 2011; Tivoli and Zangrando 2011), but the remains of cephalopods, shrimp and squat lobsters are missing. These taxa are important prey for modern South American sea lions (Thompson et al 1998; Koen Alonso et al 2000; Suárez et al 2005; Romero et al 2011) and hence necessary for comparisons between the stable isotope ratios of ancient South American sea lions and those of potential prey from the same period and region.…”

Section: Methodsmentioning

confidence: 99%

“…The South American sea lion Otaria flavescens is widely distributed along some 10,000 km of the coast of South America (Cappozo and Perrin 2009). According to the zooarchaeological record, pinnipeds and other marine species were widely exploited by the hunter-gatherers inhabiting the Beagle Channel and northern Patagonia during the late Holocene, although the effect of aboriginal hunting on their populations remains uncertain (Schiavini 1993; Orquera and Piana 1999; Gómez Otero 2006; Favier Dubois et al 2009; Favier Dubois and Kokot 2011; Orquera et al 2011; Tivoli and Zangrando 2011; Borella and Cruz 2012; Favier Dubois and Scartascini 2012). Modern exploitation through its entire range began in the eighteenth century and lasted until the first half of the twentieth century, by which time the species had been severely depleted (Cappozo and Perrin 2009).…”

Section: Introductionmentioning

confidence: 99%

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Shifting niches of marine predators due to human exploitation: the diet of the South American sea lion (Otaria flavescens) since the late Holocene as a case study

Zenteno¹,

Borella²,

Otero³

et al. 2015

Paleobiology

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Abstract—Stable isotope ratios of carbon and nitrogen in archaeological and modern bone samples have been used to reconstruct the dietary changes of the South American sea lion Otaria flavescens from the late Holocene to the present in the southwestern Atlantic. We sampled bones from archaeological sites in northern-central and southern Patagonia, Argentina, and bones housed in modern scientific collections. Additionally, we analyzed the stable isotope ratios in ancient and modern shells of intertidal molluscs to explore changes in the isotope baseline and allow comparison between bone samples from different periods after correction for baseline shifts. Results confirmed the trophic plasticity of the South American sea lion, demonstrated the much larger impact of modern exploitation of marine resources as compared with that of hunter-gatherers, and underscored the dissimilarity between the past and modern niches of exploited species. These conclusions are supported by the rather stable diet of South American sea lions during several millennia of aboriginal exploitation, in both northern-central and southern Patagonia, and the dramatic increase in trophic level observed during the twentieth century. The recent increase in trophic level might be related to the smaller population size resulting from modern sealing and the resulting reduced intraspecific competition. These results demonstrate how much can be learned about the ecology of modern species thanks to retrospective studies beyond the current, anthropogenically modified setting where ecosystem structure is totally different from that in the pristine environments where current species evolved.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shifting niches of marine predators due to human exploitation: the diet of the South American sea lion (Otaria flavescens) since the late Holocene as a case study

Zenteno¹,

Borella²,

Otero³

et al. 2015

Paleobiology

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“…Also, the dunes concentrate groundwater, thus offering an important source of fresh water within a semi-arid environment. The archaeological localities known in the San Matías Gulf are frequently located in aeolian deposits developed on marine terraces or on landforms of fluvial origin (Favier Dubois & Kokot 2011). The archaeological record is found in deposits like shell middens and on the surface across the landscape (Manzi et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The Study of lithic assemblages on deflation surfaces. The case study of Arroyo Verde, Northern Patagonia coast, Argentina

Carranza

2018

JLS

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This paper focuses on surface lithic artefacts from Holocene coastal hunter gatherer occupations of Arroyo Verde archaeological locality (Rio Negro province, Northern Patagonia, Argentina). The study of lithic assemblages collected at a deflation surface surrounded by stabilised sand dunes near the coastline, shows that wind produce significant corrasion (wind abrasion) of artefacts and affects preservation of small and medium size artefacts. The sample is mainly composed of chert knapping debitage with abraded and polished edges and surfaces. The artefact size distribution suggests that a subset of the assemblage exhibits good preservation, possibly due to the recent subaerial exposure. Furthermore, carbonate and mould coatings were recorded over the artefacts surface in contact with the ground, which indicates the presence of humid conditions in the sand dunes deflation area. In order to explore the factors that affected assemblage stability conditions in the locus, a machine learning based decision tree was applied. The model predicts and defines a threshold at which the occurrence of instability conditions may appear. Also, it suggests that relative altitude of artefacts within the deflation hollow is the primary variable explaining the exposure conditions recorded in the artefacts and it points out processes of differential deflation over time. The data presented here illustrates how wind alters local surface materials and emphasizes that a taphonomic perspective is needed to assess the formation processes within northern Patagonia coastal archaeological assemblages.

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“…However, other species, including at least three from the SMG – Chama iudicai (Pastorino, 1991), Tegula atra (Lesson, 1830) and Glycymeris sanmatiensis (Bayer & Gordillo, 2013) – became extinct, apparently during the glaciations, and were only found in the oldest Quaternary deposits surrounding this gulf (Pastorino, 1991; Bayer & Gordillo, 2013; Gordillo et al ., 2014; Charó et al ., 2014). A warmer period called the Hypsithermal occurred during the middle Holocene (between 6000 and 4500 years bp ), in which temperatures were slightly higher (Schellmann & Radtke, 2010) than during the rest of the Holocene and the sea level transgression produced geomorphological changes along the Patagonian coastline (Kokot et al, 2004; Favier-Dubois & Kokot, 2011). This global event is reflected in changing marine mollusc assemblages (Gordillo et al , 2011; Charó et al , 2013).…”

Section: Introductionmentioning

confidence: 99%

Form changes inAmiantis purpurata(Bivalvia, Veneridae) shells over the past 100,000 years in North Patagonia (Argentina)

et al. 2015

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Amiantis purpurata shells from the San Matías Gulf (SMG) were analysed in order to compare both morphology and size throughout the late Quaternary in relation to environmental changes. Shells from modern beaches, Holocene marine assemblages (late Holocene, 3630 ± 100 years bp) and interglacial Pleistocene marine assemblages (MIS 5, 100 ka years bp) were studied by measuring the height and length, and using the elliptic Fourier analysis (EFA) to take an outline contour. The Pleistocene shells were smaller, more elliptical and with a deeper lunule than the Holocene and modern ones. No significant differences were recorded in the allometry index throughout the late Quaternary. The variation in size and shape of the A. purpurata shells could be related to the phenotypic plasticity of this species as a response to the environmental changes registered in the SMG during the Quaternary. These changes include variations in sea surface temperatures, salinities and substrates, and also water circulation changes, which would have modified nutrient availability. Morphological changes imply burrowing activity, mechanical stability, nutrient uptake and defence response to predation.

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Changing scenarios in Bajo de la Quinta (San Matías Gulf, Northern Patagonia, Argentina): Impact of geomorphologic processes in subsistence and human use of coastal habitats

Cited by 46 publications

References 9 publications

Shifting niches of marine predators due to human exploitation: the diet of the South American sea lion (Otaria flavescens) since the late Holocene as a case study

Shifting niches of marine predators due to human exploitation: the diet of the South American sea lion (Otaria flavescens) since the late Holocene as a case study

The Study of lithic assemblages on deflation surfaces. The case study of Arroyo Verde, Northern Patagonia coast, Argentina

Form changes inAmiantis purpurata(Bivalvia, Veneridae) shells over the past 100,000 years in North Patagonia (Argentina)

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