With the aim of knowing seasonal variability of lead in fish and bivalve species from Coatzacoalcos estuary, biota collected during three seasons was examined. In muscle tissue of fish, the highest level (5.4 microg g(-1)) was found in the longnose gar Lepisosteus osseus from San Francisco stream (a highly impacted site); the lowest value (0.2 microg g(-1)) was registered in yellowfin mojarra Gerres cinereus from Ostión lagoon (control site). In bivalves, concentrations in soft tissue ranged from 1.5 microg g(-1) in Polymesoda caroliniana from Calzadas river, to 0.1 microg g(-1) in Corbicula fluminea from Hidalgotitlán (control site).

译文

为了了解来自Coatzacoalcos河口的鱼类和双壳类物种中铅的季节性变化,研究了三个季节收集的生物群。在鱼类的肌肉组织中,在旧金山溪流 (高度受影响的部位) 的长鼻gar Lepisosteus ossossus中发现了最高水平 (5.4 microg g(-1)); 最低值 (0.2微克 (-1)) 记录在osti ó n泻湖 (对照位点) 的黄鳍mojarra Gerres cinereus中。在双壳类动物中,软组织中的浓度范围从Calzadas河的polycesoda caroliniana中的1.5微克g(-1) 到hidalgotl á n (对照部位) 的Corbicula fluminea中的0.1微克g(-1)。

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