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- Boethius, Adam, et al.
(author)
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Advances and prerequisites for strontium isotope analyses through laser ablation in an aquatic context – Targeting Mid-Neolithic Baltic Sea harp seal (Pagophilus groenlandicus) mobility and breeding grounds
- 2024
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In: Quaternary Science Reviews. - 0277-3791. ; 331
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Journal article (peer-reviewed)abstract
- Harp seals (Phoca groenlandicus), once present in the Baltic Sea, now stand extinct. During the Middle Neolithic period, they held significant dietary importance for the Pitted Ware Culture hunter-fisher-gatherers in Scandinavia. Because they are no longer available for ecological studies, little is known about their specific behavioural intricacies, such as diet, mobility, and reproductive strategies. Because of the seal's pivotal role in these human societies and because they provide an interesting ecological case study on post-isolation ecological adaptation to new environmental conditions, a comprehensive investigation into Baltic Sea harp seal behaviour is warranted. In this pursuit, we employ sequential analysis of strontium isotope ratios (87Sr/86Sr) in harp seal teeth sourced from archaeological contexts across three study regions. This data is harmonized with osteometric analyses from fifteen archaeological sites from the Baltic Sea area, establishing a methodological framework for comprehending the Sr isotopic pathway in a brackish water inland sea. By adopting this approach, we unveil breeding and mobility patterns of the long-extinct Baltic Sea harp seals, approximate specific breeding areas connected to each group of seals and delve into the ontogenic temporal frame governing these observed patterns. This endeavour culminates in an enriched understanding of the adaptive behaviours exhibited by Baltic Sea harp seals and equips us with the insights necessary to decipher the lifestyle of the human societies intricately intertwined with them.
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| 2. |
- Boethius, Adam, et al.
(author)
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Assessing laser ablation multi-collector inductively coupled plasma mass spectrometry as a tool to study archaeological and modern human mobility through strontium isotope analyses of tooth enamel
- 2022
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In: Archaeological and Anthropological Sciences. - : Springer Science and Business Media LLC. - 1866-9557 .- 1866-9565. ; 14:5
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Journal article (peer-reviewed)abstract
- To evaluate the possibility of obtaining detailed individual mobility data from archaeological teeth, the strontium isotope ratios on 28 human teeth from three separate Early-Mid Holocene, Swedish, foraging contexts (Norje Sunnansund, Skateholm and Västerbjers) were analysed through laser ablation. The teeth/individuals have previously been analysed using traditional bulk sampled thermal ionisation mass spectrometry. To validate the conclusions regarding the archaeological teeth, a tooth from a modern man with a known background was also analysed. The result shows that all of the teeth display less than 0.4% discrepancy between the mean values of the laser ablation profiles and the previously published bulk data and 25 (89%) of the teeth display less than a 0.2% discrepancy. By calculating linear and polynomial trendlines for each ablated tooth, it was possible to illustrate a strong correlation for the transition pattern between the measurements when following a chronological sequence from the tip to the cervix. Such correlations were not reproduced when the data sequence was randomized. The analyses show that the chronologically sequenced ablation data fit with a transition between local bioavailable strontium regions, that the measurements do not fluctuate between extremes and that their values are not caused by end-member mixing. This indicates an increasing data resolution when reducing strontium isotope ratio averaging time by minimizing the sampling area. The results suggest strontium incorporation in human teeth can be measured on an ordinal scale, with a traceable chronological order to enamel mineralization when sampled from tip to cervix at an equal distance from the surface. Micro-sampling enamel is considered a valid method to assess prehistoric, but not modern, human mobility; laser ablation technology increases the amount of information obtained from a single tooth while rendering minimal damage to the studied specimen.
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| 5. |
- Boethius, Adam, et al.
(author)
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Diachronic forager mobility : untangling the Stone Age movement patterns at the sites Norje Sunnansund, Skateholm and Västerbjers through strontium isotope ratio analysis by laser ablation
- 2022
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In: Archaeological and Anthropological Sciences. - : Springer Science and Business Media LLC. - 1866-9557 .- 1866-9565. ; 14:9
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Journal article (peer-reviewed)abstract
- Strontium isotope ratios in human teeth from the three Swedish prehistoric Stone Age hunter-fisher-gathering societies Norje Sunnansund (Maglemose), Skateholm (Ertebølle) and Västerbjers (Pitted Ware Culture) were analysed with laser ablation to produce data on both individual movement patterns and societal mobility trends. The analyses of teeth from both Skateholm and Västerbjers displayed homogeneous ratios and corresponding mobility patterns, while the data from Norje Sunnansund showed larger variances with heterogenous strontium ratios and varied inter-individual mobility patterns. Correlation with the bioavailable baseline suggests that the size of the geographical areas, where human strontium ratios could have originated, was roughly comparable for all three sites. The teeth measurements were reflected within a 50-km radius of the surrounding landscape and the 25–75% data quartile matched with distances between 3 and 30 km from the sites, suggesting limited mobility ranges among aquatically dependent foragers from southernmost Sweden. By applying ethnographic analogies and site-specific contextual inferences, the results suggest that mobility ranges at Norje Sunnansund were likely not delimited by neighbouring group territories. This changed over time and an increasing territorialisation of the landscape may have influenced movement patterns and caused restrictions to the foraging activities at both Skateholm and Västerbjers.
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| 6. |
- Boethius, Adam, et al.
(author)
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Early Holocene Scandinavian foragers on a journey to affluence: Mesolithic fish exploitation, seasonal abundance and storage investigated through strontium isotope ratios by laser ablation (LA‐MC-ICP‐MS)
- 2021
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In: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 16:1, s. e0245222-e0245222
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Journal article (peer-reviewed)abstract
- At Norje Sunnansund, an Early Holocene settlement in southern Sweden, the world’s earliest evidence of fermentation has been interpreted as a method of managing long-term and large-scale food surplus. While an advanced fishery is suggested by the number of recovered fish bones, until now it has not been possible to identify the origin of the fish, or whether and how their seasonal migration was exploited. We analysed strontium isotope ratios (87Sr/86Sr) in 16 cyprinid and 8 pike teeth, which were recovered at the site, both from within the fermentation pit and from different areas outside of it, by using laser ablation multi-collector inductively coupled plasma mass spectrometry. Our investigation indicates three different regions of origin for the fish at the site. We find that the most commonly fermented fish, cyprinids (roach), were caught in the autumn during their seasonal migration from the Baltic Sea to the sheltered stream and lake next to the site. This is in contrast to the cyprinids from other areas of the site, which were caught when migrating from nearby estuaries and the Baltic Sea coast during late spring. The pikes from the fermentation pit were caught in the autumn as by-catch to the mainly targeted roach while moving from the nearby Baltic Sea coast. Lastly, the pikes from outside the fermentation pit were likely caught as they migrated from nearby waters in sedimentary bedrock areas to the south of the site, to spawn in early spring. Combined, these data suggest an advanced fishery with the ability to combine optimal use of seasonal fish abundance at different times of the year. Our results offer insights into the practice of delayed-return consumption patterns, provide a more complete view of the storage system used, and increase our understanding of Early Holocene sedentism among northern hunter-fisher-gatherers. By applying advanced strontium isotope analyses to archaeological material integrated into an ecological setting, we present a methodology that can be used elsewhere to enhance our understanding of the otherwise elusive indications of storage practices and fish exploitation patterns among ancient foraging societies.
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| 8. |
- Boethius, Adam, et al.
(author)
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Fish and resilience among Early Holocene foragers of southern Scandinavia : A fusion of stable isotopes and zooarchaeology through Bayesian mixing modelling
- 2018
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In: Journal of Archaeological Science. - : Elsevier BV. - 0305-4403. ; 93, s. 196-210
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Journal article (peer-reviewed)abstract
- This study highlights the importance of different protein sources in the diet of Early and Middle Mesolithic humans in southern Scandinavia, and illustrates variation and change in protein consumption patterns during the Early Holocene. By combining previously published stable isotope data with new analyses of human and animal bone remains, a Bayesian mixing model was used to reveal that fishing was more important than previously anticipated in the foraging economy. Incorporating the zooarchaeological record as a prior to guide the Bayesian model enabled further study of Early Holocene foraging in the region. Although primarily a study of human diet, because the results indicate that aquatic systems were more important than previously acknowledged, it is possible to discuss the implications for understanding Early Holocene subsistence strategies and mobility. Furthermore, by incorporating both zooarchaeological data and human stable isotope analysis, the methodology can advance palaeodietary studies, by generating dietary protein estimations that can be used to investigate subsistence strategies across a diverse set of human societies.
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| 9. |
- Boethius, Adam
(author)
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Fishing for ways to thrive : Integrating zooarchaeology to understand subsistence strategies and their implications among Early and Middle Mesolithic southern Scandinavian foragers
- 2018
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Doctoral thesis (other academic/artistic)abstract
- The purpose of this thesis is to evaluate and deduce the varied lifeways of Early Holocene foragers in southern Scandinavia. By taking an interdisciplinary approach, zooarchaeological data have been applied to the study of different aspects of Early and Middle Mesolithic subsistence, in order to frame a discussion concerning our current understanding of culture and life in early north European societies. Three different sites/areas are the focus: Norje Sunnansund, Huseby Klev and Gotland/Gisslause. However, all available material from the chosen temporal and spatial frame have been incorporated to enable holistic discussions. The three focus areas combined comprise all available coastal settlements with well-preserved organic material from the Early Mesolithic period, which has led to discussions centred on the use of aquatic resources and the importance of fish.To address the different aspects of Early and Middle Mesolithic subsistence, multiple approaches have been taken, whereby zooarchaeological methods have been combined with statistical, chemical, physical and ethnographical tools for analysis. The focus has varied between fish storage and conservation practice, by presenting evidence for delayed-return subsistence strategies through means of large-scale fish fermentation, and discussions concerning the evidence for a delayed-return lifestyle and sedentism, through the study of zooarchaeological assemblages. Furthermore, taphonomy is highlighted and discussed in order to address the many biases affecting the recovery of freshwater fish bones and the consequences for detecting a freshwater fish-based diet. Pioneer subsistence strategies are studied, and changes through time are highlighted in marine coastal regions. In addition, the reservoir effect in radiocarbon dating (14C) of human bones has been examined to evaluate the consequences of a freshwater reservoir effect stemming from a large dietary input of freshwater fish. Furthermore, stable isotopes values, δ13C and δ15N, in the collagen from all available Early and Middle Mesolithic humans have also been analysed and modelled, in order to evaluate the importance of each individual protein source in the diet.The results from the different approaches taken indicate that humans relied on fish to a higher degree and from an earlier date than previously assumed. This has implications for how Early Holocene societies are interpreted; indicating the use of delayed-return subsistence strategies, diminishing mobility and emerging sedentism already existed during the Early Mesolithic period. Overall, the results of this thesis suggest a growing territoriality, which implies that the emergence of social stratification is conceivable at an early stage of Scandinavian prehistory and offers an insight into the lifestyle of Early Holocene foragers at latitudes around 55–59° N.
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