Aarhus University Seal / Aarhus Universitets segl

Rune Dietz

Variation in skull bone mineral density of ringed seals (Phoca hispida) from the Gulf of Bothnia and West Greenland between 1829 and 2019

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Britta Schmidt, University of Veterinary Medicine Hannover, Foundation
  • ,
  • Christian Sonne
  • Dominik Nachtsheim, University of Veterinary Medicine Hannover, Foundation
  • ,
  • Rune Dietz
  • Ralf Oheim, University Medical Center Hamburg-Eppendorf
  • ,
  • Tim Rolvien, University Medical Center Hamburg-Eppendorf
  • ,
  • Sara Persson, Swedish Museum of Natural History
  • ,
  • Michael Amling, University Medical Center Hamburg-Eppendorf
  • ,
  • Ursula Siebert

Bone is remodelled constantly through a balance of bone formation and resorption. This process can be affected by various factors such as hormones, vitamins, nutrients and environmental factors, which can create an imbalance resulting in systemic or local bone alteration. The aim of the present study was to analyse the changes in bone mineral density (BMD) over time in skulls of ringed seals (Pusa hispida) from the Baltic and Greenland using museum samples. Overall, 303 skulls (102 Male, 89 Female, 112 unknown) were used for bone investigations and were divided into three periods according to collection year: before 1958 (n = 167), between 1958 and 1989 (n = 40) and after 1994 up to 2019 (n = 96). All skulls were examined by dual-energy X-ray absorptiometry to obtain the BMD. Skull BMD of the Baltic seals was positively correlated with the historical polychlorinated biphenyls (PCB) contamination having potential effects on the constitution of bones. BMD fluctuated between the three study periods (LM: p-value < 0.001, F-value = 47.5) with the lowest BMD found between 1897 and 1957, in the Gulf of Bothnia, where the highest peak of contaminant concentration was in the second period. BMD levels increased with increasing PCB concentration (LM: p < 0.001). The Greenland population showed significant lower BMD levels in the pollution and post-pollution period than the Baltic population (LM: p < 0.001). It also revealed a higher BMD in males than in females (LM: p = 0.03). In conclusion, the variations between 1829 and 2019 in the Baltic Sea and Greenland may to a certain extent reflect normal fluctuations; however, this study revealed several factors affecting BMD, including sex and PCB levels.

OriginalsprogEngelsk
Artikelnummer105968
TidsskriftEnvironment International
Vol/bind143
Antal sider9
ISSN0160-4120
DOI
StatusUdgivet - okt. 2020

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