One of the most basic questions concerning a sequence of ecosystem measurements is the presence or absence of a trend. An 11 year monthly record of meiofauna abundance and physical variables is used to illustrate a trend analysis. The analysis models the errors about a regression line as an autoregressive process, a special case of ARIMA time series models. Predicting with confidence and rational planning of future temporal spacing and replication with regard to the trend question are discussed.
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Edwards et al. (1987) studied this question.
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