δ13C and δ15N variations in terrestrial and marine foodwebs of Beagle Channel in the Holocene. Implications for human paleodietary reconstructions

Kochi, Sayuri; Pérez, Suray A.; Tessone, Augusto; Ugan, Andrew; Tafuri, Mary Anne; Nye, Jonathan W.; Tivoli, Angélica M.; Zangrando, Atilio Francisco Javier

doi:10.1016/j.jasrep.2017.11.036

Cited by 14 publications

(15 citation statements)

References 81 publications

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“…Previous research has reported high trophic redundancy in ancient food webs in the South-Western Atlantic Ocean (Kochi et al, 2018;Saporiti, Bearhop, et al, 2014). Although niche theory predicts trophic segregation, high trophic overlap is the expected outcome in top-down controlled ecosystems where hungry predators capture prey according to the encounter rate (Gill, 2003;Persson et al, 1996;Werner & Hall, 1974).…”

Section: Discussionmentioning

confidence: 94%

“…Common galaxias migrate to estuaries to spawn and Bahía Cambaceres Interior had a strong estuarine influence 1,278–1,013 cal years BP (Zangrando, Ponce, et al, ), thus suggesting the existence of a higher connectivity between freshwater and marine ecosystems in the Beagle Channel 1,278–1,013 cal years BP. Ancient cormorant from other archaeological sites in the Beagle Channel had stable isotope ratios more consistent with a marine diet (Kochi et al, ), but the ancient cormorant from Lanashuaia II may have relied largely on migratory common galaxias spawning in the area (Casaux et al, ). However, the abundance of common galaxias has declined as a result of the introduction of salmonids and the fish community of the lower reaches of rivers and estuaries is currently dominated by exotic species (Cussac et al, ), too large to be exploited successfully by cormorants (Casaux et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Previous research in the South-Western Atlantic Ocean using stable isotopes has indeed documented changes in the trophic position of pinnipeds during the Holocene (Drago et al, 2009;Saporiti, Bearhop, et al, 2014;Vales et al, 2017;Zenteno, Borella, et al, 2015) and a higher trophic redundancy in ancient food webs (Kochi et al, 2018;Saporiti, Bearhop, et al, 2014). Fish diets are also expected to change, but nothing is known about previous changes resulting from increasing fishing pressure and decreasing seal populations.…”

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confidence: 99%

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Back to the future? Late Holocene marine food web structure in a warm climatic phase as a predictor of trophodynamics in a warmer South‐Western Atlantic Ocean

Bas

Godino

Álvarez

et al. 2018

Global Change Biology

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Stable carbon and nitrogen isotope ratios in the skeletal elements of both ancient and modern marine species from the Beagle Channel were used to compare the structure of Late Holocene and modern food webs, and predict potential changes as a result of a Sea Surface Temperature (SST) increase in the region. Complementary, ancient and modern shells of limpets and mussels were isotopically analysed to explore changes in the isotopic baseline and compare marine food webs through time after an appropriate correction for baseline shifts. Results confirmed a declining pattern of marine primary productivity during the Late Holocene in the Beagle Channel. In general, the isotopic niches overlapped largely in the ancient food web in comparison to the current marine one, with the exception of that of cormorants (Phalacrocorax sp.). Our data suggest that all the species that have undergone intense human exploitation (Arctocephalus australis, Otaria flavescens and Merluccius sp.) significantly increased their trophic levels. The most important finding of this work was the very high isotopic overlap between snoek (Thyrsites atun) and hake (Merluccius sp.) during the Late Holocene. Increasing SST as a result of global warming could favour the recolonization of the southern South‐Western Atlantic Ocean by snoek from the South‐Eastern Pacific Ocean, with a potential impact on the landings of the economically important Argentine and Austral hake. These findings highlight the relevance of using zooarchaeological remains for providing predictions about marine food webs changes in the near future.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Back to the future? Late Holocene marine food web structure in a warm climatic phase as a predictor of trophodynamics in a warmer South‐Western Atlantic Ocean

Bas

Godino

Álvarez

et al. 2018

Global Change Biology

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“…Although there are many works of stable isotopes in human palaeodiets, we consider important to start studying the isotopic ecologies of the different areas to deepen the interpretations on the subsistence strategies of hunter‐gatherers and their spatial and temporal variations. Recently, for the Beagle channel, an extensive database of marine resources has been generated (Kochi et al, ). In this sense, the differences between the isotopic values of pinnipeds and cormorants registered in the Beagle Channel and in this research are interesting.…”

Section: Resultsmentioning

confidence: 99%

Stable isotope ecology and human palaeodiet in the northern coast of Santa Cruz (Argentine Patagonia)

Zilio

Tessone

Hammond

2018

Intl J of Osteoarchaeology

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The aim of this paper is to provide information on the analysis of stable isotopes obtained from bones of marine and terrestrial fauna used as potential food by hunter‐gatherers on the northern coast of Santa Cruz province (Argentine Patagonia). The results from the isotopic ecology are analysed to contribute to dietary interpretations of the human populations who lived in this area. The mean of terrestrial resources is −19.1‰ ± 1.8‰ and 9.2‰ ± 2.6‰ for δ13C and δ15N, respectively. Meanwhile, marine resources recorded a mean of δ13C −12.5‰ ± 1.2‰ and δ15N of 19.4‰ ± 2.4‰. The analysed human samples come from different types of burials dated mainly in the Late Holocene. The δ13C and δ15N isotopic values on human remains suggest the existence of different diets during the Late Holocene, including people who consumed mainly marine, terrestrial, and mixed proteins, with a range between −18‰ to −10.4‰ and 12.4‰ to 23.4‰ for δ13C and δ15N, respectively. Some of these isotopic values, which indicate marine diets, are the highest recorded for Patagonia. The influence of the marine spray on the terrestrial trophic chains is suggested for the Patagonian Atlantic coast, evidenced by higher values in the δ15N of guanacos from the coast in relation to others studied from the hinterland.

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“…De esta forma se conformó una ecología isotópica compuesta en el ambiente marino por mamíferos marinos (Sepúlveda et al 2015), crustáceos (Muñoz et al 2013), moluscos (Mayr et al 2011) y peces (Mayr et al 2011; Muñoz et al 2013). Por último, para la representación de las aves marinas se consideraron los valores disponibles para la región del canal Beagle (Kochi et al 2018).…”

Section: Methodsunclassified

Dieta e isótopos estables de cazadores recolectores marinos en los canales occidentales de Patagonia, Chile

et al. 2019

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Las excavaciones arqueológicas y los registros bioantropológicos realizados en el archipiélago de los Chonos (entre 43° 50’ y 46° 50’ S), a lo largo de los canales occidentales de Patagonia, permiten definir la ocupación de este sistema insular por parte de cazadores recolectores marinos desde el Holoceno medio hasta el contacto europeo. Sus conjuntos tecnológicos y arqueofaunísticos señalan una dependencia de recursos del medio litoral y marítimo. La información de isótopos estables del carbono y nitrógeno en restos humanos asociados a estos contextos provee una herramienta de análisis independiente para evaluar las interpretaciones realizadas sobre la base de otros conjuntos de datos arqueológicos. Este trabajo presenta los resultados de análisis de δ13C y δ15N de 38 individuos con edades en el rango entre 2300 y 200 cal aP (fechamientos directos 14C por AMS), así como de muestras complementarias de arqueofauna. El análisis de los valores isotópicos respalda la interpretación de una adaptación cazadora recolectora fundamentada en un patrón de subsistencia enfocado principalmente en recursos litorales y marinos. Los valores de δ13C y δ15N son comparados con los obtenidos de otros grupos canoeros de los canales centrales y meridionales de Patagonia, poniendo de relieve las diferencias en trayectorias de subsistencia entre las regiones involucradas.

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δ13C and δ15N variations in terrestrial and marine foodwebs of Beagle Channel in the Holocene. Implications for human paleodietary reconstructions

Cited by 14 publications

References 81 publications

Back to the future? Late Holocene marine food web structure in a warm climatic phase as a predictor of trophodynamics in a warmer South‐Western Atlantic Ocean

Back to the future? Late Holocene marine food web structure in a warm climatic phase as a predictor of trophodynamics in a warmer South‐Western Atlantic Ocean

Stable isotope ecology and human palaeodiet in the northern coast of Santa Cruz (Argentine Patagonia)

Dieta e isótopos estables de cazadores recolectores marinos en los canales occidentales de Patagonia, Chile

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