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- Ahlgren, Hans, 1984-, et al.
(författare)
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The Baltic grey seal : A 9000-year history of presence and absence
- 2022
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Ingår i: The Holocene. - : SAGE Publications. - 0959-6836 .- 1477-0911. ; 32:6, s. 569-577
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Tidskriftsartikel (refereegranskat)abstract
- The grey seal (Halichoerus grypus) has been part of the Baltic Sea fauna for more than 9000 years and has ever since been subjected to extensive human hunting, particularly during the early phases of its presence in the Baltic Sea, but also in the early 20th century. In order to study their temporal genetic structure and to investigate whether there has been a genetically continuous grey seal population in the Baltic, we generated mitochondrial control region data from skeletal remains from ancient grey seals from the archaeological sites Stora Förvar (Sweden) and Neustadt (Germany) and compared these with modern grey seal data. We found that the majority of the Mesolithic grey seals represent haplotypes that is not found in contemporary grey seals, indicating that the Baltic Sea population went extinct, likely due to human overexploitation and environmental change. We hypothesize that grey seals recolonised the Baltic Sea from the North Sea. during the Bronze Age or Iron Age, and that the contemporary Baltic grey seal population is direct descendants of this recolonisation. Our study highlights the power of biomolecular archaeology to understand the factors that shape contemporary marine diversity.
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| 2. |
- Choi, Seoyun, et al.
(författare)
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Parent personality is linked to juvenile mortality and stress behavior in the arctic fox (Vulpes lagopus)
- 2019
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Ingår i: Behavioral Ecology and Sociobiology. - : Springer Science and Business Media LLC. - 0340-5443 .- 1432-0762. ; 73:12
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Tidskriftsartikel (refereegranskat)abstract
- Life history theory predicts that individuals will differ in their risk-taking behavior according to their expected future fitness. Understanding consequences of such individual variation within a behavioral trait is crucial in explaining potential trade-offs between different traits and in predicting future dynamics in changing environments. Here, we studied individuals in a wild arctic fox population to explore if (1) individual variation in risk-taking behaviors of adult arctic foxes and in stress-dealing behaviors of their juveniles exist and are consistent over time to verify the existence of personality traits; (2) those behavioral traits in adults and juveniles are correlated; (3) they can explain fitness-related components (i.e., juvenile physical condition, mortality rate). We presented simple field experiments assessing behavioral traits by observing adult reactions toward approaching observers, and juvenile behaviors while trapping. Through the experiments, we found highly consistent individual variation of adults in vigilance and boldness levels, and more flexible juvenile behavioral traits categorized as investigating, passive, and escaping. The offspring of bolder adults exhibited more investigating behaviors and were less passive than the offspring of shy adults. Juvenile physical condition was not related to their mortality nor any behavioral traits of either parents or themselves. Lastly, highly investigating and active juveniles with bold parents had significantly lower mortality rates. This shows that interactions between parent personality and juvenile behavioral traits affect a fitness-related component in the life history of individuals. Significance statement The recent surge of interest in consistent individual difference in behavior, also called as animal personality, has already focused on its fitness consequences, but few studies have investigated the interactions between parent and offspring personality, and their ecological consequences. Moreover, this has rarely been studied in wild canids. The arctic fox is a charismatic species showing wide individual variation in behaviors. They live in highly fluctuating tundra ecosystems providing different selection regimes, making it even more eco-evolutionarily intriguing. Yet, few studies looked into behavioral traits and their importance in this system. While introducing simple methods to improve personality research in the wild, we provide a unique example of how variation in both parents and their juveniles collectively works for group dynamics in a cyclic population. This provides a firm basic for understanding behavior-mediated dynamics and opens up broader questions on how fluctuating environments exert varying pressures on individual differences.
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| 3. |
- Fjellström, Markus, 1987-, et al.
(författare)
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Approaching historic reindeer herding in Northern Sweden by stable isotope analysis
- 2020
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Ingår i: Journal of Nordic Archaeological Science. - 1650-1519. ; 19, s. 63-75
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Tidskriftsartikel (refereegranskat)abstract
- A strong cultural connection exists between reindeer and modern Sámi identityand economy. Reindeer domestication is, however, a rather late event, andthere are many Sámi who live off resources other than reindeer herding. Theuse of stable isotope analysis on historic reindeer from different geographicareas can contribute to analysing both the processes involved in reindeer domesticationand different environmental utilization by the Sámi. In this study,reindeer bones from six different sites in northern Sweden, ranging in datefrom the 11th to the 20th century, were analysed for stable isotopes to studyhow reindeer have been utilized in various historic contexts – settlements,offering sites and a marketplace. The stable isotope analysis demonstrateddifferent practices in utilization of reindeer, such as foddering. Foddering issuggested to have caused the elevated δ15N values found in reindeer at theoffering sites Vindelgransele and Unna Saiva, as well as at the settlementVivallen. The analysis further indicates that the offering sites were used bysingle Sámi groups. An important outcome of our study is that the biologyof reindeer in Sápmi was culturally influenced by the Sámi even before thereindeer was domesticated.
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