Low levels of persistent organic pollutants (POPs) in New Zealand eels reflect isolation from atmospheric sources.
Polychlorinated biphenyls (PCBs) and organic pesticides (i.e., DDTs) were measured in long finned eels (Anguilla dieffenbachii) in 17 streams on the west coast of South Island, New Zealand. Very low levels of PCBs and low levels of ppDDE were found. The concentrations of PCBs and ppDDE were not correlated within sites indicating that different processes determined the levels of the two pollutants in New Zealand eels. The PCBs probably originate from atmospheric transport, ppDDE levels are determined by land use and are higher in agriculture areas. The low contamination level of these aquatic systems seems to be a function of a low input from both long and short-range transport as well as few local point sources. No correlation could be found between lipid content and persistent organic pollutants (POPs) concentration (as shown in previous studies) in the eels which could be explained by low and irregular intake of the pollutants.
Holmqvist
Niklas
N
Department of Ecology, Section of Ecotoxicology, Ecology Building, Lund University, SE-223 62 Lund, Sweden. niklas.holmqvist@ekol.lu.se
Stenroth
Patrik
P
Berglund
Olof
O
Nyström
Per
P
Olsson
Karin
K
Jellyman
Don
D
McIntosh
Angus R
AR
Larsson
Per
P
D000818:Animals; D004524:Eels; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis*; D005618:Fresh Water; D009520:New Zealand; D010575:Pesticides / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis*
D004785:Environmental Pollutants; D010575:Pesticides; D011078:Polychlorinated Biphenyls