This study evaluates tributyltin (TBT) pollution on a spatial-temporal scale using imposex occurrence in Stramonita brasiliensis in a coastal region of the southeast Brazil, between 2007 and 2018, and tests the viability of this species as a tool to evaluate the environmental quality through the Ecological Quality Ratio (EQR). Imposex indexes varied during the monitoring period, with I% varying from 0% to 100%, Vas Deference Sequence Index (VDSI) from 0 to 4.11 and Index of Relative Penis Length (RPLI) from 0 to 51. The EQR indexes indicated high levels of contamination by TBT in the first years of the study (2007 to 2011), followed by an improvement in the ecological status in the last two years (2017 and 2018). This study confirmed the viability of the use of EQR to evaluate the environmental status in a tropical region by means of an endemic species. Our results indicate that the Espírito Santo coastline is still contaminated with TBT, especially in areas close to ports and fishing activity.

本研究使用巴西蝾螈中的强行发生在时空尺度上评估三丁基锡 (TBT) 污染2007 年至 2018 年在巴西东南部的沿海地区，并测试该物种作为通过生态质量比 (EQR) 评估环境质量的工具的生存能力。Imposex 指数在监测期间各不相同，I% 从 0% 到 100% 不等，血管顺从序列指数 (VDSI) 从 0 到 4.11，相对阴茎长度指数 (RPLI) 从 0 到 51。EQR 指数显示高水平在研究的头几年（2007 年至 2011 年）受 TBT 污染的情况有所改善，随后在过去两年（2017 年和 2018 年）生态状况有所改善。这项研究证实了使用 EQR 通过特有物种评估热带地区环境状况的可行性。我们的结果表明，圣埃斯皮里图海岸线仍然受到 TBT 的污染，