Organochlorine and mercury concentrations in eggs of grey plovers (Pluviulis squuturola) breeding in the Lena Delta, Seven eggs from four clutches of grey plovers (PI~wialis syuararola) breeding in the Lena Delta, Sakha Republic, Yakutia, in 1997 were analysed for persistent organochlorines and mercury. Contamination levels were low and within the same range as found in eggs from waders (Charadriiformes) breeding in north-west Europe. One exception was CHCH, averaging 99.2 ng g -' fresh egg

more »

... , a level about ten times higher than in wader eggs from north-west Europe. P-HCH accounted for 98% of the total HCH concentration. There are indications that the pesticide levels may reflect former local use. CPCB level (57.0 ng g-', 62 congeners) and mercury concentration (68.7 ng g-') can be considered low.