Silveira M P, Baptista D F, Buss D F, Nessimian J L, Egler M
Laboratório de Avaliação e Promoção da Saúde Ambiental, Departamento de Biologia, IOC, FIOCRUZ, Av. Brasil 4365, Manguinhos, Rio de Janeiro, RJ, Brasil
Environ Monit Assess. 2005 Feb;101(1-3):117-28. doi: 10.1007/s10661-005-9141-1.
The sensitivity of eleven metrics using macroinvertebrate assemblages were evaluated in an environmental gradient in a tropical river in south-east Brazil. Eight sites were sampled in an altitudinal range of 160-650 m.a.s.l. during 1999 (April and August) and 2000 (February). Four substrates were sampled at each site: riffle litter, pool litter, stony substrates and sediment. Correspondence Analysis indicated that assemblages were primarily more influenced by physical changes (like deforestation and erosion processes) than the water chemistry. The sensitivity of each metric was evaluated through the application of box-and-whisker plot method by its power to assess impairment (metrics should be able to discriminate reference sites from impaired sites) and natural variability (metrics should not discriminate two reference sites). Metrics that failed in at least one of the above premises were not considered as sensitive. In this study, the most sensitive metrics were Shannon index, BMWP-ASPT, %_EPT, and relative abundance of EPT to Chironomidae.
在巴西东南部一条热带河流的环境梯度中，对利用大型无脊椎动物群落的11种指标的敏感性进行了评估。1999年（4月和8月）以及2000年（2月）期间，在海拔160 - 650米的范围内选取了8个采样点。每个采样点对四种基质进行了采样：浅滩枯枝落叶、水塘枯枝落叶、石质基质和沉积物。对应分析表明，群落主要受物理变化（如森林砍伐和侵蚀过程）的影响大于水化学。通过应用箱线图法，根据其评估受损情况的能力（指标应能够区分参考点和受损点）以及自然变异性（指标不应区分两个参考点）来评估每个指标的敏感性。在上述至少一个前提下不满足的指标不被视为敏感指标。在本研究中，最敏感的指标是香农指数、生物学监测工作组平均科级点数、蜉蝣目-襀翅目-毛翅目昆虫百分比以及蜉蝣目-襀翅目-毛翅目昆虫与摇蚊科的相对丰度。
