Aarhus University Seal / Aarhus Universitets segl

Rune Dietz

Prevalence of skull pathologies in European harbor seals (Phoca vitulina) during 1981-2014

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

DOI

  • Cino Pertoldi, Section of Biology and Environmental Science, Department of Chemistry and Bioscience, Aalborg University, Aalborg Zoo
  • ,
  • Lasse Fast Jensen, Section of Biology and Environmental Science, Department of Chemistry and Bioscience, Aalborg University
  • ,
  • Aage Kristian Olsen Alstrup
  • Ole Lajord Munk
  • Trine Bæk Pedersen, Section of Biology and Environmental Science, Department of Chemistry and Bioscience, Aalborg University, Danmark
  • Christian Sonne-Hansen
  • Rune Dietz
  • Tobias Daugaard-Petersen
  • ,
  • Hanne E Kortegaard, Københavns Universitet, Ukendt
  • Morten Tange Olsen, Københavns Universitet
  • ,
  • Karin Charlotte Hårding, Department of Biological and Environmental Sciences, Sverige
  • Trine Hammer Jensen, Aalborg Zoo, Section of Biology and Environmental Science, Department of Chemistry and Bioscience, Aalborg University, Danmark

Harbor seals (Phoca vitulina) inhabit the seas surrounding Denmark and are an important top predator in the marine food chain. This trophic position exposes them to environmental contaminants with disease epidemics and hunting being additional threats to this population. It is therefore important to study how environmental pollution at the current order of magnitude affects the health of the population. Earlier studies have shown that occurrence of periodontitis could be linked to the amount of pollution the seals were subjected to. In order to investigate this further, 380 skulls and 141 mandibles of harbor seals (Phoca vitulina) from the Wadden Sea, the Limfjord, and Kattegat collected during the period 1970–2014 were examined. The skulls were examined for pathological lesions. The Hounsfield Units (HU) which are correlated to the bone mineral density (BMD) were measured in a subsample (n = 34) using CT scans. The macroscopic examination revealed (with the exception of the Swedish part of Kattegat) a significant increase of pathological lesions over the study period of 1981–2014. The examination of HU showed that median HU measured at multiple sites was highest in the healthy skulls compared to the skulls with one or more of the lesions. A discriminant analysis allowed high discriminatory capacity to separate healthy skulls from the skulls with pathologies, simply by the utilization of the HU data. Former studies of BMD in marine mammals have shown that exposure to environmental chemicals alter BMD and cause periodontitis. The present study, based on temporal and spatial trends in BMD, confirms the results of previous studies.

OriginalsprogEngelsk
TidsskriftMammal Research
Vol/bind63
Nummer1
Sider (fra-til)55-63
Antal sider9
ISSN2199-2401
DOI
StatusUdgivet - jan. 2018

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