Half a century of changing mercury levels in Swedish freshwater fish
2014 (English)In: Ambio, ISSN 0044-7447, Vol. 43, 91-103 p.Article in journal (Refereed) Published
The variability of mercury (Hg) levels in Swedish freshwater fish during almost 50 years was assessed based on a compilation of 44 927 observations from 2881 waters. To obtain comparable values, individual Hg concentrations of fish from any species and of any size were normalized to correspond to a standard 1-kg pike [median: 0.69 mg kg(-1) wet weight (ww), mean +/- SD: 0.84 +/- 0.67 mg kg(-1) ww]. The EU Environmental Quality Standard of 0.02 mg kg(-1) was exceeded in all waters, while the guideline set by FAO/WHO for Hg levels in fish used for human consumption (0.5-1.0 mg kg(-1)) was exceeded in 52.5 % of Swedish waters after 2000. Different trend analysis approaches indicated an overall long-term decline of at least 20 % during 1965-2012 but trends did not follow any consistent regional pattern. During the latest decade (2003-2012), however, a spatial gradient has emerged with decreasing trends predominating in southwestern Sweden.
Place, publisher, year, edition, pages
2014. Vol. 43, 91-103 p.
Mercury, Freshwater, Environmental Quality Standard, Trend analysis
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-111415DOI: 10.1007/s13280-014-0564-1ISI: 000345292300008OAI: oai:DiVA.org:su-111415DiVA: diva2:775754