Departamento de Biologia, Faculdade de Filosofia Ciências e Letras, Universidade de São Paulo-USP, CEP: 14040-900, Ribeirão Preto, SP, Brazil.
Environ Monit Assess. 2011 Jun;177(1-4):545-54. doi: 10.1007/s10661-010-1655-5. Epub 2010 Aug 17.
Streams located in areas of sugarcane cultivation receive high concentrations of metal ions from soils of the adjacent areas causing accumulation of metals in the aquatic sediment. This impact results in environmental problems and leads to bioaccumulation of metal ions in aquatic organisms. In the present study, metal concentrations in different predatory insects were studied in streams near sugarcane cultivation and compared to reference sites. Possible utilisation of predatory insects as bioindicators of metal contamination due to sugarcane cultivation from 13 neotropical streams was evaluated. Ion concentrations of Al, Cd, Cr, Cu, Zn, Fe, and Mn in adult Belostomatidae (Hemiptera) and in larvae of Libellulidae (Odonata) were analysed. Nine streams are located in areas with sugarcane cultivation, without riparian vegetation (classified as impacted area) and four streams were located in forested areas (reference sites). Metal concentrations in insects were higher near sugarcane cultivations than in control sites. Cluster analysis, complemented by an ANOSIM test, clearly showed that these insect groups are good potential bioindicators of metal contamination in streams located in areas with sugarcane cultivation and can be used in monitoring programmes. We also conclude that Libellulidae appeared to accumulate higher concentrations of metals than Belostomatidae.
位于甘蔗种植区的溪流从邻近地区的土壤中接收高浓度的金属离子，导致水体沉积物中的金属积累。这种影响导致了环境问题，并导致金属离子在水生生物中发生生物蓄积。在本研究中，研究了甘蔗种植区附近溪流中不同捕食性昆虫的金属浓度，并与对照点进行了比较。评估了来自 13 条新热带溪流的捕食性昆虫是否可能被用作甘蔗种植导致金属污染的生物标志物。分析了成年龙虱科（半翅目）和蜻蜓科（蜻蜓目）幼虫中的 Al、Cd、Cr、Cu、Zn、Fe 和 Mn 离子浓度。有 9 条溪流位于没有河岸植被（划为受影响区）的甘蔗种植区，4 条溪流位于森林区（对照点）。昆虫体内的金属浓度在甘蔗种植区附近高于对照点。聚类分析，辅以 ANOSIM 检验，清楚地表明，这些昆虫类群是甘蔗种植区溪流金属污染的良好潜在生物标志物，可用于监测计划。我们还得出结论，蜻蜓目比龙虱科似乎积累了更高浓度的金属。
