Document qjJk8Kkwg8Z8owbGokYMbgj

1>w' MILWAUKEE, W1SC. D. 169,011. _ MAY 13 1969 '^j \ ......... 'fi; *' --pi r M j^ Some Bird Species;'.'^ By QUINCY DADISMAN - . . drocarbon compounds widely ,; Sentinel Staff Writer used In Industry, PCB's how*.; w Madison, Wls. - A Callfor- tip in some test equipment It) I nia biochemist testified Mon way that makes separation of^. ' day that his studies have con DDT in analysis much more^ vinced him that DDT and not difficult. ^-'<1 another commonly found con taminant is the cause of thin Only Few Found eggshells which he believes .Risebrough said that while' will wipe out certain predatory PtlTs arc found in large bird species. . amounts in many marine birds, he had found only a few lm. Robert Risebrough, Berke which there were more PCB'*, ley, Calif, was called as an ad than DT5',l3il!ls^6taboHties..' verse witness by thd attorney ^ormFiiit^ whicFTITcFanges in* defending t h e^ nMicide. at a passing through living tissue). natural Resource department hearing on a petition calling Ho said that tests with eggs/ for banning DDT in Wisconsin, containing up to one part per- ;. Testified Earlier Risebrough had testified in December for the petitioners million (p.p.nv) of PCB's end. up to six p.p.m. of DDT in all forms showed mathematically,' -- Citizens' Natural Resource by correlation with eggshell association and thd Wisconsin thickness that DDE and not chapter of the Izaak Walton PCB's, were to blame. The', league -- about DDE, a form tests were made mathematical-. ' into which DDT changes in liv ly,' he said, with a statistical ing bodies and his conviction accuracy of 99.9%. Vv,, that DDE causes a metabolic ' He said that damage to disturbance in birds which eggshells from DDT can '*0 ,j leads to thin eggshells. . traced not only to the DDE In,' ' The thin shell cracks' easily, the bird's body fat, but also to ; causing the death of the em" the amount present in the foot} ; bryo inside the egg.-: . it eats. '\ Risebrough was called by "DDT may be comparatively f Willard S. Stafford, Madison Inactive in the body fat," he r attorney who Is conducting the concluded, explaining that per- -fl defense of DDT for the Nation e g r 1 n e falcons from Arctic i al Agricultural Chemicals asso areas seem to be sustaining ! ciation. ; ,1 their numbers better than Stafford questioned R 1 s e- those from more temperate cllf . brough about work he has mates because the food they ', done with polychlorinated bi eat while' rearing a: second .1 phenyls (PCB), a g6up of hy- clutch of eggs is "cleatn" j 7, . r < 1/ y\- ' ` ' vs . . i,'' ... . i M ,V DSW 433644 STLCOPCB4086752