Blus L J, Neely B S, Lamont T G, Mulhern B
Pestic Monit J. 1977 Jun;11(1):40-53.
Shells of brown pelican (Pelecanus occidentalis) eggs collected in South Carolina from 1969 through 1973 were significantly thinner than shells of those collected before 1947. Residues of 10 organochlorine pollutants and 10 heavy metals were found in these eggs. Total organochlorine residues were apparently magnified 23 times from fish to pelican eggs, but interpretation of biomagnification was complicated by the migratory habits of both the pelicans and their chief prey fish. Residues of organochlorine pollutants and heavy metals were also found in tissues of brown pelicans. Dieldrin was probably involved in the death of a pelican that exhibited myocardial necrosis. Other pelicans died from gunshot wounds, various diseases, or unknown causes. From 1969 through 1973, there was a significant decline in residues of p-p'-DDE, p-p'-TDE, p-p'DDT, and dieldrin in eggs of the brown pelican in South Carolina, but the rate of decline was different for each pollutant. PCB's peaked in 1972 and then declined in 1973 to the lowest level in 5 years. In 1973, the first time in many years, South Carolina brown pelicans reproduced very well. The excellent reproductivity seemed related to lowered organochlorine residues and favorable tides, weather, and food supply.
1969年至1973年在南卡罗来纳州收集的褐鹈鹕（Pelecanus occidentalis）蛋的蛋壳明显比1947年以前收集的蛋的蛋壳薄。在这些蛋中发现了10种有机氯污染物和10种重金属的残留物。从鱼到鹈鹕蛋，有机氯残留物总量显然放大了23倍，但由于鹈鹕及其主要捕食鱼类的迁徙习性，生物放大作用的解释变得复杂。在褐鹈鹕的组织中也发现了有机氯污染物和重金属的残留物。狄氏剂可能与一只出现心肌坏死的鹈鹕死亡有关。其他鹈鹕死于枪伤、各种疾病或不明原因。1969年至1973年，南卡罗来纳州褐鹈鹕蛋中对，对'-滴滴伊、对，对'-滴滴滴、对，对'-滴滴涕和狄氏剂的残留物显著下降，但每种污染物的下降速度不同。多氯联苯在1972年达到峰值，然后在1973年下降到5年来最低水平。1973年，南卡罗来纳州的褐鹈鹕多年来首次繁殖得非常好。这种出色的繁殖能力似乎与有机氯残留物的减少以及有利的潮汐、天气和食物供应有关。
