Document 4452pVLJzdDJ0D0M7EGrnXYa1

MILWAUKEE, W1SC. D. 168,011. V MAY 13 1969 ........................ ' <! ------------jr- Some Bird Species Called DDT Victims i Dy QUINCY DADISMAN drdcarbon compounds widely ,{ : Sentinel Staff Wrlttr used in Industry. PCS'* show*; w Madison, WIs, A Califor bp Irt soma test equipment id a V nia biochemist testified Mon way that makes separation of^ day that his studies have con DDT In analysis much morn, vinced him that DDT and not difficult w4 another commonly found con* taminant Is tha causa of thin Only Few Found V oggshdls which he believes Rlsebrough said that while' will wipe out certain predatory PCB't are found In largo bird species. .. amounts In many marine biros. he had found only a few In-, Robert Riscbrquah. Berks* which there were more pfcB'a.. ley, Calif., wee called as an ad* thanDOTor-i-u----m---etatabbooHltiltol s.. verso witness by Jhd attorney (rorms into which it changes in* defending t h a. oMtcida at a passing through living tlsiua). natural resource department hearing on a petition calling Ho said that tests with eggsA for banning DDT In Wisconsin. containing up to one part per( : Testified Earlier million (p-p.m.) of PCB's and , Rlsebrough had testified In up to six p.p.rn. of DDT In all. December for tho petitioners forms showed mathematically,' -- Citizens1 Natural Resource by correlation with eggshaU ssnodatlon and thd Wisconsin thickness that DDE and not' chapter of tha tsaak 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 M.9%. J that DDE causes a metabolic . Ha said that damage to.' disturbance In birds which j eggshells from DDT can ve leads to thin eggshells. , | traced not only to the DDE in", 1 Tha thin shell cracks easily, | the bird's body fat, but also to ; causing the death of tha am' the amount present In .the fpod ' bryo inside tha egg.-. . 1 - it eats. . \.i > Rlsebrough wls called by "DDT may be comparatively \ yflllard S. Stafford, Madison Inaotlva In tha body fat," ho 1 attorney who Is conducting the concluded, explaining that per- \ defense of DDT for the Nation* e | r I n e falcons from Arctic al Agricultural Chemicals ssso* areas stem to be sustaining;! elation. -. their Humbert better than Stafford questlohod RI * those from more temperate cllf brough about work be has mates because the food they. done with polychlorjnafed bl* eat w h 11 rearing # second i phenyls (PCB), * |6up of hy* clutch of eggs li "citan^' * } HONS 030311