Imposex is is a well-documented deleterious effect caused by tributyltin (TBT) in females of hundreds of Caenogastropoda species and it is a well-established way of predicting BTs occurrence in marine systems. This study presents the very first information on the presence and distribution of imposex in Stramonita brasiliensis (Claremont and Reid, 2011) in the Brazilian Legal Amazon, within a Ramsar site, during a 6-year appraisal after the TBT global ban in 2008 (2012–2017). Imposex was evidenced in six out of the seven sampling sites, with 39.7% of the total affected females, most of them showing VDSI <1. The temporal appraisal allowed the identification of the introduction of new sources of TBT in some sites, as well as populational recovery in other sampling points. In addition, the dilution effect present in São Marcos Bay was also likely to play an important role in the imposex distribution.

Imposex 是由三丁基锡 (TBT) 对数百种 Caenogastropoda 物种的雌性造成的一种有据可查的有害影响，它是预测海洋系统中 BTs 发生的成熟方法。这项研究首次提供了关于Stramonita brasiliensis的强行存在和分布的信息（Claremont 和 Reid，2011 年）在 2008 年（2012 年至 2017 年）全球 TBT 禁令后的 6 年评估期间，位于拉姆萨尔湿地内的巴西合法亚马逊地区。Imposex 在七个采样点中的六个中得到证实，占受影响女性总数的 39.7%，其中大多数显示 VDSI <1。时间评估可以确定一些地点引入新的 TBT 来源，以及其他采样点的种群恢复情况。此外，圣马科斯湾存在的稀释效应也可能在强版分布中发挥重要作用。