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A Rapid Method to Score Stream Reaches Based on the Overall Performance of Their Main Ecological Functions

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Abstract

A method was developed to score the ecological condition of first- to third-order stream reaches in the Auckland region of New Zealand based on the performance of their key ecological functions. Such a method is required by consultants and resource managers to quantify the reduction in ecological condition of a modified stream reach relative to its unmodified state. This is a fundamental precursor for the determination of fair environmental compensation for achieving no-net-loss in overall stream ecological value. Field testing and subsequent use of the method indicated that it provides a useful measure of ecological condition related to the performance of stream ecological functions. It is relatively simple to apply compared to a full ecological study, is quick to use, and allows identification of the degree of impairment of each of the key ecological functions. The scoring system was designed so that future improvements in the measurement of stream functions can be incorporated into it. Although the methodology was specifically designed for Auckland streams, the principles can be readily adapted to other regions and stream types.

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Acknowledgments

We thank Mike McMurtry and Joanne Wilks of the Auckland Regional Council for their assistance with fieldwork and Ngaire Phillips at NIWA (Hamilton) for her input into the refinement and standardization of the variable measuring methods. The development of this method was funded primarily by the Auckland Regional Council, with the New Zealand Foundation for Research Science and Technology supporting its publication through Contract No. CO1X0305.

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Correspondence to David K. Rowe.

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Rowe, D.K., Parkyn, S., Quinn, J. et al. A Rapid Method to Score Stream Reaches Based on the Overall Performance of Their Main Ecological Functions. Environmental Management 43, 1287–1300 (2009). https://doi.org/10.1007/s00267-009-9302-z

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