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Reproductive biology of the marron Cherax tenuimanus (Smith, 1912), in Lake Navarino, south-western Australia

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  • Communication
  • Ecology


MURDOCH RESEARCH REPOSITORY This is the author’s final version of the work, as accepted for publication following peer review but without the publisher’s layout or pagination. The definitive version is available at Hallett, C.S. (2014) Quantile-based grading improves the effectiveness of a multimetric index as a tool for communicating estuarine condition. Ecological Indicators, 39 . pp. 84-87. Copyright: © 2013 Elsevier Ltd. It is posted here for your personal use. No further distribution is permitted. 1 Quantile-based grading improves the effectiveness of a multimetric index as a tool for 1 communicating estuarine condition 2 Chris S. Hallett a,1 3 4 a Centre for Fish and Fisheries Research, School of Veterinary and Life Sciences, Murdoch 5 University, South Street, Murdoch 6150, Western Australia, Australia 6 E-mail: [email protected] Telephone: +31 (0)6 1887 5017 7 8 Abstract 9 Multimetric Fish Community Indices (FCI) were recently developed for assessing the 10 ecological condition of shallow nearshore and deeper offshore waters of the Swan-Canning 11 Estuary, Western Australia. The provisional system for classifying estuarine condition from 12 FCI scores, which divided the possible range of scores (0-100) into four descriptive classes of 13 equal breadth (good, fair, poor, very poor), was shown to be skewed towards producing fair to 14 good grades. An alternative, alphanumeric (A-E) grading system, whose grade boundaries 15 were defined by quantiles of the distribution of historical FCI scores, exhibited greater 16 apparent sensitivity to decreases in ecological condition resulting from a harmful algal bloom 17 than did the provisional classification scheme. These advantages of the quantile-based FCIs 18 have led to their recent imp

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