我们调查了多异种生物抗性(MXR)表型的活性,水生生物的生物防御系统,在两个不同程度的环境影响的热带河口的鱼类组合中,Paraiba河和Mamanguape河口.这项工作的目的是比较不同鱼类的MXR表型的活性,以检验每个物种都具有固有活性水平的假设,并将该活性用作水生污染的生物指标。我们评估了ill的MXR活性,使用罗丹明B(RB)积累测定。结果表明,在同一河口地区捕获的鱼类的MXR活性存在物种特异性差异。此外,中上层物种黑翅目Eucinostomusmelanopterus,大孔藻,Lutjanusjocu有更高的RB积累,而水下物种Sphoeroidestestimineus和Sphoeroidesgreeleyi的RB积累最低,表明水柱中鱼类的生态特征对MXR活性有影响。此外,我们证明了使用关键河口物种的illMXR活性的潜力,巴西银边巴西白喉,作为生物监测河口的工具。
We investigated the activity of the multixenobiotic resistance (
MXR) phenotype, a biological defense system in aquatic organisms, in the fish assemblages of two tropical estuaries with different degrees of environmental impacts, the Paraiba River and Mamanguape River Estuaries. The aim of this work was to compare the activity of the
MXR phenotype of different fishes to test the hypothesis that each species has an inherent activity level and to use this activity as a bioindicator of aquatic contamination. We assessed the
MXR activity of the gills, using rhodamine B (RB) accumulation assay. The results demonstrated a species-specific difference in the
MXR activity of fishes caught in the same estuarine zone. Also, the pelagic species Eucinostomus melanopterus, Eucinostomus argenteus, and Lutjanus jocu had higher RB accumulation, while the demersal species Sphoeroides testudineus and Sphoeroides greeleyi had the lowest RB accumulation, suggesting that the ecological characteristic of fish in the water column exerts an influence on MXR activity. Besides, we demonstrated the potential of using the gill
MXR activity of the key estuarine species, the Brazilian silversides Atherinella brasiliensis, as a tool for biomonitoring estuaries.