Abstract
We describe here the development of an ecosystem classification designed to underpin the conservation management of marine environments in the New Zealand region. The classification was defined using multivariate classification using explicit environmental layers chosen for their role in driving spatial variation in biologic patterns: depth, mean annual solar radiation, winter sea surface temperature, annual amplitude of sea surface temperature, spatial gradient of sea surface temperature, summer sea surface temperature anomaly, mean wave-induced orbital velocity at the seabed, tidal current velocity, and seabed slope. All variables were derived as gridded data layers at a resolution of 1 km. Variables were selected by assessing their degree of correlation with biologic distributions using separate data sets for demersal fish, benthic invertebrates, and chlorophyll-a. We developed a tuning procedure based on the Mantel test to refine the classification’s discrimination of variation in biologic character. This was achieved by increasing the weighting of variables that play a dominant role and/or by transforming variables where this increased their correlation with biologic differences. We assessed the classification’s ability to discriminate biologic variation using analysis of similarity. This indicated that the discrimination of biologic differences generally increased with increasing classification detail and varied for different taxonomic groups. Advantages of using a numeric approach compared with geographic-based (regionalisation) approaches include better representation of spatial patterns of variation and the ability to apply the classification at widely varying levels of detail. We expect this classification to provide a useful framework for a range of management applications, including providing frameworks for environmental monitoring and reporting and identifying representative areas for conservation.
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Acknowledgments
We are grateful for funding of the MEC project by the New Zealand Ministry for the Environment, Department of Conservation and Ministry of Fisheries and in particular Megan Linwood and Kirsty Johnston of the New Zealand Ministry for the Environment for their support. We thank Don Robertson of NIWA for stewardship of this project. We also thank the advisory group for their contribution to this project. We acknowledge the contributions of our colleagues, in particular Geoff Read, who groomed the invertebrate data, and Ude Shankar and Helen Hurren, who handled the GIS aspects. NIWA’s Fisheries Science Fund supported the preparation of this article. Finally, we thank Naomi Detenbeck and an anonymous reviewer whose comments improved our original manuscript.
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Snelder, T.H., Leathwick, J.R., Dey, K.L. et al. Development of an Ecologic Marine Classification in the New Zealand Region. Environmental Management 39, 12–29 (2007). https://doi.org/10.1007/s00267-005-0206-2
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DOI: https://doi.org/10.1007/s00267-005-0206-2