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Polychlorinated dioxins, furans and dl-PCBs in ringed seals (Pusa hispida botnica) from the Baltic Sea 1978-2014
Executive, Naturhistoriska riksmuseet, NRM.
Executive, Universitet, Umeå universitet, UmU, Umeå universitet, teknisk- naturvetenskapliga fakulteten, kemiska institutionen.
Responsible organisation
2015 (English)Report (Other academic)
Abstract [en]

Blubber tissue samples from in total 40 juvenile ringed seals from the Baltic Sea collected between 1978 and 2014 were analyzed for "dioxins"; polychlorinated dibenzo-p-dioxins, dibenzofurans (PCDD/PCDF) and dioxin-like PCBs (dl-PCB). Thirty-eight of the seals were bycaught in fishing gear and two were shot by mistake, taken for grey seals.

Concentrations of PCDDs, PCDFs and dl-PCBs have decreased over the study period in ringed seals with only a few exceptions. The decrease was primarily seen until year 2000 while the concentrations have been stable the last 15 years with a few exceptions. Two dioxins (1,2,3,4,6,7,8-HpCDD and OCDD) and one furan (1,2,3,7,8-PeCDF) demonstrate increased levels the last 15 year of the study period while one furan decreases (1,2,3,7,8,9-HxCDF). OCDD demonstrates the highest increase rate with 15 % yearly increase the last 15 years.

Concerning the dioxin-like PCBs, the four non-ortho, dl-PCBs demonstrate no trend the last 15 years. Four of the mono-ortho dl-PCBs continue to decrease until 2014 while the other four mono-ortho congeners show no statistically significant trends the last 15 years.

It should however be stated that a limited number of seals have been analyzed with an average of one seal/year and more analyses are demanded in order to achieve more significant time trend results.

Ringed seals show a low increase in population, approximately half of what is natural and reproductive impairment is still noted among ringed seals. If this has a connection to the concentrations of PCDD/F and dl-PCBs cannot be ruled out.

Place, publisher, year, edition, pages
Naturhistoriska riksmuseet , 2015. , 18 p.
Keyword [sv]
Östersjön, Bottenhavet, Bottenviken, Dioxiner, furaner, plana PCB, vikare, späck
National Category
Environmental Sciences
Research subject
Miljöövervakningens programområden, Coast and sea; Environmental Objectives, A Non-Toxic Environment; Finance, National
URN: urn:nbn:se:naturvardsverket:diva-6792OAI: diva2:1049322
Available from: 2016-11-24 Created: 2016-11-24 Last updated: 2016-11-24

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Naturhistoriska riksmuseet, NRMUmeå universitet, teknisk- naturvetenskapliga fakulteten, kemiska institutionen
Environmental Sciences

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