Document 3xpmp3rYdyDXa7YGJ33Xgjan

with the compliments of l^l-- RELATIONSHIP BETWEEN ORGANOCHLORINE RESIDUES IN UVERS AND WHOLE BODIES OF GUILLEMOTS J. L. F. PaHSLOW A n. J. jEfttRIFS ABSTRACT Two groups of Guillemots Uria nalgc from the Irish Sea region, one shot and the other found dead after a period of starvation, were analysed for organochlorine insecticide {DPI: and dietdrin) and PCB residues to determine whether a relation ship existed between the amounts present in the livers and the amounts present in whale bodies. Within each group a significant relationship between liver and whole hotly residues wasfound for all materials except dieidrin in the birds discovered dead. The found-dead group hud lost about 40'*,, of their hotly weight and, due to the mobilisation of depot fat, organochbrine residues in their livers were much higher tlnut In the livers of the shot birds: at mean body loads, the livers of the latter con tained only 0-9. O S and I I respectively, of the total PCB, DDE and dieidrin in the bodies, while among the birds found dead the respective proportions of body loath in the livers were 22-5, 18 8 and 123 Regression equations for the liver load: body bad relationship for each material were calculated and, using the equation for PCB in birds found dead, it has been possible to calculate, from known amounts in the lit'crs, the total both bads of 39 Guillemots found dead during the massive wreck of this species in the Irish Sat in the autumn of 1969, Together with other evidence, it is shown that the birds which died in this wreck contained mean PCB residues of AbbQ pg, or about twice as high as in healthy birds shot in the same general area. This finding invalidates an earlier nmdiiM'wi that PCB residues in birds which died in the incident were similar to those in healthy birds in the same area, and strengthens the possibility that PCB (together with natural stress factors) hyj.v implicated in the mortality. I'mfriw. t'otiui. 11973) pp. K7-I0I Applied Science Puliluher* I ul, Tni-toiid. 1473--Primed in Great llriisiin MGNS