Blus L J, Lamont T G, Neely B S
Pestic Monit J. 1979 Mar;12(4):172-84.
Shells of brown pelican (Pelecanus occidentalis) eggs collected in South Carolina from 1969 through 1975 and in Florida during 1969, 1970, and 1974 were significantly thinner (P greater than 0.05) than eggshells collected before 1947. Thickness of South Carolina eggshells increased in 1975, and mean thickness of eggshells collected in Florida during 1974 was greater than that of eggshells collected during 1969 and 1970, primarily in Gulf Coast colonies. Residues of 13 organochlorines were found in eggs and tissues of pelicans found dead during 1974 and 1975, although residues in brains of these specimens were not high enough to cause death. Residues of organochlorines, except PCBs, declined through 1975. PCBs increased in eggs from Atlantic Coast colonies. Reproductive success and population status of brown pelicans in South Carolina have improved markedly since authors began their studies in 1969. Good reproductive success was reported in 3 of 5 years from 1973 through 1977.
1969年至1975年在南卡罗来纳州收集的以及1969年、1970年和1974年在佛罗里达州收集的褐鹈鹕（Pelecanus occidentalis）蛋壳，比1947年以前收集的蛋壳明显更薄（P大于0.05）。1975年南卡罗来纳州的蛋壳厚度增加，1974年在佛罗里达州收集的蛋壳平均厚度大于1969年和1970年收集的蛋壳，主要是在墨西哥湾沿岸的栖息地。在1974年和1975年死亡的鹈鹕的卵和组织中发现了13种有机氯的残留，尽管这些样本大脑中的残留量不足以导致死亡。除多氯联苯外，有机氯的残留在1975年之前有所下降。大西洋沿岸栖息地的卵中多氯联苯含量增加。自作者于1969年开始研究以来，南卡罗来纳州褐鹈鹕的繁殖成功率和种群状况有了显著改善。1973年至1977年的5年中有3年报告了良好的繁殖成功率。
