Evaluating long-term trends in littoral benthic macroinvertebrate communities of lakes recovering from acid deposition
Evaluating long-term trends in littoral benthic macroinvertebrate communities of lakes recovering from acid deposition
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DOI：
10.1007/s10661-011-2489-5
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发表时间：
2012-12-01
影响因子：
3
通讯作者：
Somers, Keith M.
中科院分区：
文献类型：
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作者：
Lento, Jennifer;Dillon, Peter J.;Somers, Keith M.
Mann-Kendall检验是一种非参数方法，用于评估具有缺失值、序列相关性和非正态性的长期水质数据集的趋势。然而，该测试很少用于评估生物数据的长期趋势。在这项研究中，我们使用的Mann-Kendall测试，以评估15年的数据，底栖大型无脊椎动物群落从17个前寒武纪盾湖的趋势。我们还使用了货车贝儿和休斯测试的趋势同质性，以评估是否存在共同的湖泊的时间趋势。我们假设，湖泊之间的共同区域趋势的证据将支持从过去的酸化长期生物恢复的假设。我们发现，摇蚊科的比例下降，蜉蝣目，鳞翅目，毛翅目（EPT）的比例增加，在单湖和多湖的趋势分析。此外，在九个湖泊中，有六个湖泊在一种以上的底栖生物指标上表现出显着趋势，其中摇蚊科数量显着减少，同时EPT数量增加，这表明它们正在向对酸更敏感的类群转变。几个生物指标的微弱趋势表明，这些湖泊的恢复受到阻碍。这项研究的结果表明，Mann-Kendall和货车贝儿和休斯趋势测试是有用的统计工具，以评估生物数据的长期模式。
The Mann-Kendall test has been proposed as a nonparametric method to evaluate trends in long-term water quality datasets with missing values, serial correlation, and non-normality. However, this test has rarely been used to evaluate long-term trends in biological data. In this study, we used the Mann-Kendall test to evaluate trends in 15 years of data on benthic macroinvertebrate communities from 17 Precambrian Shield lakes. We also used the van Belle and Hughes test of trend homogeneity to assess whether common among-lake temporal trends existed. We assumed that evidence of a common regional trend among lakes would support the hypothesis of long-term biological recovery from past acidification. We found decreasing proportions of Chironomidae and increasing proportions of Ephemeroptera, Plecoptera, and Trichoptera (EPT) in both single-lake and multi-lake trend analysis. Moreover, six of the nine lakes with significant trends in more than one benthos metric displayed a significant decrease in Chironomidae and increase in EPT concurrently, indicating a shift towards more acid-sensitive taxa. Weak trends in several of the biological metrics indicated that recovery in these lakes has been impeded. Results of this study indicate that the Mann-Kendall and van Belle and Hughes trend tests are useful statistical tools to evaluate long-term patterns in biological data.