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首页> 外文期刊>Journal of Environmental Science and Health >Filtration rate, assimilation and assimilation efficiency in Crassostrea virginica (Gmelin) fed with Tetraselmis suecica under cadmium exposure
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Filtration rate, assimilation and assimilation efficiency in Crassostrea virginica (Gmelin) fed with Tetraselmis suecica under cadmium exposure

机译：镉暴露下饲喂Tetraselmis suecica的初生Crassostrea virginica（Gmelin）的过滤率，同化和同化效率

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Crassostrea virginica is an epibentic filter-feeding bivalve of economical importance in coastal lagoons of the Gulf of Mexico, locations with increasing inputs of heavy metals such as cadmium that have become environmental stressors. In this study, feeding and assimilation of the species were evaluated as physiological indicators of cadmium exposure. For this purpose, the filtration rate (FR), food assimilation (A) and assimilation efficiency (AE) of oysters from the Mandinga Lagoon, Veracruz, Mexico, were examined under sublethal and environmentally realistic cadmium concentrations (95 and 170 μgCd L~(-1)). Semi-static, 12-day bioassays were conducted with organisms placed into individual chambers and fed daily with Tetraselmis suecica. FR was calculated by measuring the depletion in algal density. Caloric contents of food and feces produced were also obtained. Condition Index (CI) and morphometric parameters were evaluated at the beginning and at the end of the assay. Total cadmium concentrations were quantified in water and tissue, and the metal bioconcentration factor (BCF) was calculated. Cadmium exposure significantly reduced FR in oysters (mean value: 0.64 L h~(-1) and 6.44 L h~(-1)) from control values (1.17 L h~(-1)). Extreme values among results demonstrate the existence of a high FR (over 4 L h~(-1)) mainly in control oysters, and this was associated with a better physiological condition; a low FR (under 2.5 L h~(-1)) indicated metabolic stress as a consequence of Cd exposure. A and AE were significantly modified due to cadmium external levels, and time of exposure. FR and A were linearly related, and both decreased as metal BCF increased. Cadmium bioaccumulation was linearly related with external metal levels. The physiological deterioration of native C. virginica from Mandinga Lagoon was reflected in the alteration of FR, A and AE due to cadmium exposure in concentrations considered sublethal, lowering the feeding and assimilation capability of the organisms. The weight loss and mortality recorded in the oysters exposed to the highest metal concentration, was the final consequence of the overall adverse effect of cadmium exposure.
机译：Crassostrea virginica是一种在墨西哥湾沿海泻湖中具有经济重要性的表皮过滤器饲喂双壳类动物，这些地区的重金属（例如镉）输入增加，这些已成为环境压力源。在这项研究中，该物种的摄食和同化被评估为镉暴露的生理指标。为此，在亚致死和环境实际镉浓度（95和170μgCdL〜（〜）的条件下，对墨西哥韦拉克鲁斯市曼丁加泻湖牡蛎的过滤率（FR），食物同化（A）和同化效率（AE）进行了检查-1））。对半生物进行为期12天的生物测定，将生物置于单独的隔间中，每天喂食Tetraselmis suecica。通过测量藻类密度的减少来计算FR。还获得了食物和粪便的热量含量。在试验开始和结束时评估条件指数（CI）和形态参数。对水和组织中镉的总浓度进行定量，并计算出金属生物富集因子（BCF）。镉暴露显着降低了牡蛎的FR（平均值：0.64 L h〜（-1）和6.44 L h〜（-1）），低于对照值（1.17 L h〜（-1））。结果中的极值表明主要在对照牡蛎中存在较高的FR（超过4 L h〜（-1）），这与更好的生理状况有关；低FR（低于2.5 L h〜（-1））表示由于Cd暴露引起的代谢应激。由于镉的外部水平和暴露时间，A和AE发生了显着变化。 FR和A线性相关，并且都随着金属BCF的增加而降低。镉的生物积累与外部金属水平呈线性关系。来自曼丁加泻湖的天然维吉尼亚衣原体的生理退化反映在FR，A和AE的变化，这是由于镉暴露于亚致死浓度引起的，从而降低了生物的摄食和同化能力。暴露于最高金属浓度的牡蛎中记录的体重减轻和死亡率是镉暴露总体不利影响的最终结果。

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