PCB pollution continues to impact populations of orcas and other dolphins in European waters.
Sci Rep
; 6: 18573, 2016 Jan 14.
Article
in En
| MEDLINE
| ID: mdl-26766430
ABSTRACT
Organochlorine (OC) pesticides and the more persistent polychlorinated biphenyls (PCBs) have well-established dose-dependent toxicities to birds, fish and mammals in experimental studies, but the actual impact of OC pollutants on European marine top predators remains unknown. Here we show that several cetacean species have very high mean blubber PCB concentrations likely to cause population declines and suppress population recovery. In a large pan-European meta-analysis of stranded (n = 929) or biopsied (n = 152) cetaceans, three out of four species- striped dolphins (SDs), bottlenose dolphins (BNDs) and killer whales (KWs) had mean PCB levels that markedly exceeded all known marine mammal PCB toxicity thresholds. Some locations (e.g. western Mediterranean Sea, south-west Iberian Peninsula) are global PCB "hotspots" for marine mammals. Blubber PCB concentrations initially declined following a mid-1980s EU ban, but have since stabilised in UK harbour porpoises and SDs in the western Mediterranean Sea. Some small or declining populations of BNDs and KWs in the NE Atlantic were associated with low recruitment, consistent with PCB-induced reproductive toxicity. Despite regulations and mitigation measures to reduce PCB pollution, their biomagnification in marine food webs continues to cause severe impacts among cetacean top predators in European seas.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Water Pollutants
/
Water Pollution, Chemical
/
Polychlorinated Biphenyls
/
Dolphins
/
Whale, Killer
Limits:
Animals
Country/Region as subject:
Europa
Language:
En
Journal:
Sci Rep
Year:
2016
Document type:
Article
Affiliation country:
Reino Unido