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Abstract:

In this paper, we analyze the isotopic niche and resource use of the guanaco (Lama guanicoe), pampas deer (Ozotoceros bezoarticus) and marsh deer (Blastocerus dichotomus) on the temperate plain of the northern Pampa region in the southeast of South America. The measured stable isotope compositions in bone tissue are δ 13 C, δ 15 N and δ 18 O. All the analyzed samples were recovered from different archaeological sites from the late Holocene. According to the results, the guanaco was strictly confined to the Pampa plain environment, developing a broad niche based on C 3 plants and a variable contribution of C 4 grasses within a grazing trend. The pampas deer preferentially used the Pampa plain, but also the prairies on the borders of the wetland, showing eurioic characteristics and a narrower niche based on C 3 plants. In turn, the marsh deer was strictly confined to wetland environments, developing a C 3 diet–base, within a narrow isotopic niche and stenoic characteristics. The three mammals showed a wide range of intraspecific variability, which was a key factor in their adaptability to spatial and temporal changes in the vegetation coverage. In fact, the temporal trends of their isotopic values were concurrent with the major climatic variations of the Holocene. Differences in the correlations between the values of both carbon sources in both deer species compared with the guanaco suggest a distinct chemical composition of their diet and/or differences in the allocation of nutrients. The isotopic values of nitrogen and spacing of the carbon sources in guanaco (pseudoruminant) and both deer species (ruminants) show no significant differences between them, thus establishing the values for local large herbivores. Significant correlations between δ 13 C and δ 15 N were found in the guanaco and marsh deer. The regional and extra–regional variability in the guanaco's δ 13 C collagen and δ 15 N probably reflect the clinal variations in the vegetation coverage and the amount of rainfall. The collagen isotope values in the guanaco throughout the entire Holocene show that the humid Pampa would have shifted between being a more recurrent mesic and temperate plain with minor phases of dry–mesic conditions like during the Little Ice Age, and a humid and warm one at the peaks of the Holocene Thermal Maximum and the Medieval Climatic Anomaly. The guanaco and the pampas deer adapted to all the climatic changes that happened on the humid Pampa until the biological invasions of large European mammals changed the herbivores’ guild composition of this vast plain, pushing them into peripheral habitats due to competition. The within–species variability in isotopic signals through time and space make it necessary to carry out adequate sampling before reconstructing the diets of local past populations. © 2019, © Association for Environmental Archaeology 2019.

Registro:

Documento: Artículo
Título:Patterns of Resource Use and Isotopic Niche Overlap Among Guanaco (Lama guanicoe), Pampas Deer (Ozotoceros bezoarticus) and Marsh Deer (Blastocerus dichotomus) in the Pampas. Ecological, Paleoenvironmental and Archaeological Implications
Autor:Loponte, D.; Corriale, M.J.
Filiación:National Council of Scientific and Technical Research (CONICET), National Institute of Anthropology and Latin American Thought (INAPL), Buenos Aires, Argentina
National Council of Scientific and Technical Research (CONICET), Institute of Ecology, Genetics and Evolution, University of Buenos Aires (IEGEBA, UBA), Buenos Aires, Argentina
Palabras clave:Guanaco; Holocene climatic variations; isotopic niche; marsh deer; Pampa region; Pampas deer; δ 13 C; δ 15 N; δ 18 O
Año:2019
DOI: http://dx.doi.org/10.1080/14614103.2019.1585646
Título revista:Environmental Archaeology
Título revista abreviado:Environ. Archeol.
ISSN:14614103
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_14614103_v_n_p_Loponte

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Citas:

---------- APA ----------
Loponte, D. & Corriale, M.J. (2019) . Patterns of Resource Use and Isotopic Niche Overlap Among Guanaco (Lama guanicoe), Pampas Deer (Ozotoceros bezoarticus) and Marsh Deer (Blastocerus dichotomus) in the Pampas. Ecological, Paleoenvironmental and Archaeological Implications. Environmental Archaeology.
http://dx.doi.org/10.1080/14614103.2019.1585646
---------- CHICAGO ----------
Loponte, D., Corriale, M.J. "Patterns of Resource Use and Isotopic Niche Overlap Among Guanaco (Lama guanicoe), Pampas Deer (Ozotoceros bezoarticus) and Marsh Deer (Blastocerus dichotomus) in the Pampas. Ecological, Paleoenvironmental and Archaeological Implications" . Environmental Archaeology (2019).
http://dx.doi.org/10.1080/14614103.2019.1585646
---------- MLA ----------
Loponte, D., Corriale, M.J. "Patterns of Resource Use and Isotopic Niche Overlap Among Guanaco (Lama guanicoe), Pampas Deer (Ozotoceros bezoarticus) and Marsh Deer (Blastocerus dichotomus) in the Pampas. Ecological, Paleoenvironmental and Archaeological Implications" . Environmental Archaeology, 2019.
http://dx.doi.org/10.1080/14614103.2019.1585646
---------- VANCOUVER ----------
Loponte, D., Corriale, M.J. Patterns of Resource Use and Isotopic Niche Overlap Among Guanaco (Lama guanicoe), Pampas Deer (Ozotoceros bezoarticus) and Marsh Deer (Blastocerus dichotomus) in the Pampas. Ecological, Paleoenvironmental and Archaeological Implications. Environ. Archeol. 2019.
http://dx.doi.org/10.1080/14614103.2019.1585646