Woodwell G M, Wurster C F, Isaacson P A
Science. 1967 May 12;156(3776):821-4. doi: 10.1126/science.156.3776.821.
DDT residues in the soil of an extensive salt marsh on the south shore of Long Island averaged more than 13 pounds per acre (15 kilograms per hectare); the maximum was 32 pounds per acre (36 kilograms per hectare). A systematic sampling of various organisms from the vicinity showed concentrations of DDT increasing with trophic level through more than three orders of magnitude from 0.04 part per million in plankton to 75 parts per million in a ring-billed gull. Highest concentrations occurred in scavenging and carnivorous fish and birds, although birds had 10 to 100 times more than fish. These concentrations approach those in animals dying from DDT poisoning, which suggests that many natural populations in this area are now being affected, possibly limited, by DDT residues. Similar concentrations have been reported elsewhere in North America.
长岛南岸一片广阔盐沼土壤中的滴滴涕残留量平均每英亩超过13磅（每公顷15千克）；最高值为每英亩32磅（每公顷36千克）。对附近各种生物进行的系统采样显示，滴滴涕的浓度随着营养级的升高而增加，从浮游生物中的百万分之0.04增加到环嘴鸥体内的百万分之75，增幅超过三个数量级。尽管鸟类体内的滴滴涕含量比鱼类高10到100倍，但最高浓度出现在食腐和食肉鱼类及鸟类体内。这些浓度接近因滴滴涕中毒死亡的动物体内的浓度，这表明该地区许多自然种群现在可能正受到滴滴涕残留的影响，甚至可能受到限制。北美其他地方也报告了类似的浓度。
