Principal response curves: Analysis of time‐dependent multivariate responses of biological community to stress

Environmental Toxicology and Chemistry - Tập 18 Số 2 - Trang 138-148 - 1999
van den1, Cajo J. F. ter Braak2
1DLO Winand Staring Centre for Integrated Land, Soil and Water Research, P.O. Box 125, 6700 AC Wageningen, The Netherlands
2Centre for Biometry Wageningen, CPRO-DLO P.O. Box 16, 6700 AA Wageningen, The Netherlands

Tóm tắt

AbstractIn this paper a novel multivariate method is proposed for the analysis of community response data from designed experiments repeatedly sampled in time. The long‐term effects of the insecticide chlorpyrifos on the invertebrate community and the dissolved oxygen (DO)–pH–alkalinity–conductivity syndrome, in outdoor experimental ditches, are used as example data. The new method, which we have named the principal response curve method (PRC), is based on redundancy analysis (RDA), adjusted for overall changes in community response over time, as observed in control test systems. This allows the method to focus on the time‐dependent treatment effects. The principal component is plotted against time, yielding a principal response curve of the community for each treatment. The PRC method distills the complexity of time‐dependent, community‐level effects of pollutants into a graphic form that can be appreciated more readily than the results of other currently available multivariate techniques. The PRC method also enables a quantitative interpretation of effects towards the species level.

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Environmental Toxicology and Chemistry

Tập 18 Số 2

138-148

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