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Oria Stage Ii Expansion Keep River Laccophilus revis ORIA STAGE II EXPANSION KEEP RIVER BASELINE AQUATIC FAUNA & TARGETED SAWFISH SURVEYS 2013 8 April 2014 ORIA Stage II Expansion – Keep River Baseline Aquatic Fauna & Targeted Sawfish Surveys September/October 2013 Prepared for: LandCorp Wesfarmers House, 40 The Esplanade, Perth WA 6000 Locked bag 5, Perth Business Centre, Perth WA 6849 Phone: (61 8) 9482 7499, Fax: (61 8) 9481 0861 by: Wetland Research & Management 16 Claude Street, Burswood, WA 6100 Ph +61 8 9361 4325 e-mail: [email protected] Final Report v3 8 May 2014 Frontispiece: (top to bottom) juvenile dwarf sawfish ( Pristis clavata ) at EST03; freshwater whipray ( Himantura dalyensis ) at SR4; saltwater crocodile (Crocodylus porosus ) at K1-2 (photos by WRM ©). ii Study Team WRM Project Management: Andrew Storey Fieldwork: Adam Harman & Alex Riemer Macroinvertebrate identification: Kim Nguyen, Bonita Clark, Simon Ward Report: Jess Delaney & Sue Davies Internal review: Andrew Storey External Experts Chironomidae taxonomy: Dr Don Edward (The University of Western Australia) Acknowledgements This project was undertaken by Wetland Research & Management (WRM) on behalf of LandCorp. WRM would like to thank the Department of Water staff in Kununurra for logistical support, in particular Duncan Palmer and Luke Donovan. We would also like to thank Helen Larson, Richard George and Don Bennett for constructive discussions, and Deb Pearce, Peter Stubbs and Helen Larson for comments on the draft report. Water and sediment sample analyses were conducted by the ChemCentre W.A. Recommended Reference Format WRM (2014). ORIA Stage II – Keep River Baseline Aquatic Fauna and Targeted Sawfish Survey September/October 2013. Unpublished report to LandCorp prepared by Wetland Research & Management. Final report v3, 8 May 2014. Disclaimer This document was based on the best information available at the time of writing. While Wetland Research & Management (WRM) has attempted to ensure that all information contained within this document is accurate, WRM does not warrant or assume any legal liability or responsibility to any third party for the accuracy, completeness, or usefulness of any information supplied. The views and opinions expressed within are those of WRM and do not necessarily reflect those of LandCorp. No part of this publication may be reproduced in any form, stored in any retrieval system or transmitted by any means electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of LandCorp and WRM. Document history Version Submitted Reviewed by Date Draft v0 25/03/2014 Andrew Storey (WRM internal review) 14/04/2014 Draft v1 29/04/2014 Sue Davies (WRM) – update draft 05/05/2014 Draft v2 06/05/2014 Andrew Storey (WRM, final internal review before submission) 06/06/2014 Draft v3 08/05/2014 LandCorp & IRG 30/06/2014 Final 30/06/2014 Andrew Storey (WRM) 14/08/2014 iii Keep River Baseline Aquatic Fauna & Targeted Sawfish Surveys 2013 CONTENTS 1 INTRODUCTION .................................................................................................................................. 1 1.1 Background ..................................................................................................................................... 1 1.2 Scope of Work ................................................................................................................................. 2 2 SAMPLING SITES................................................................................................................................ 3 3 SEDIMENT SAMPLING ....................................................................................................................... 6 3.1 Rationale ......................................................................................................................................... 6 3.2 Methods ........................................................................................................................................... 6 3.2.1 Sampling sites ........................................................................................................................ 6 3.2.2 Field methods ......................................................................................................................... 6 3.2.3 Data analysis .......................................................................................................................... 7 3.3 Results and Discussion ................................................................................................................... 8 3.3.1 Sediment quality – univariate analyses .................................................................................. 8 3.3.2 Multivariate patterns in the sediment data ........................................................................... 14 3.4 Conclusions ................................................................................................................................... 16 4 TARGETED SAWFISH AND GLYPHIS SHARK SURVEYS............................................................. 17 4.1 Rationale ....................................................................................................................................... 17 4.2 Methods ......................................................................................................................................... 17 4.2.1 Sampling sites ...................................................................................................................... 17 4.2.2 Field methods ....................................................................................................................... 17 4.2.3 Data analysis ........................................................................................................................ 18 4.3 Results and Discussion ................................................................................................................. 19 4.3.1 Species recorded – Pristis sawfish & freshwater whipray Himantura dalyensis .................. 19 4.3.2 Sawfish sex ratio .................................................................................................................. 21 4.3.3 Sawfish population estimates ............................................................................................... 21 4.3.4 Sawfish movement ............................................................................................................... 21 4.4 Conclusions ................................................................................................................................... 21 5 AQUATIC FAUNA ECOLOGICAL HEALTH ..................................................................................... 24 5.1 Rationale ....................................................................................................................................... 24 5.2 Methods ......................................................................................................................................... 24 5.2.1 Sampling sites ...................................................................................................................... 24 5.2.2 Water quality ......................................................................................................................... 24 5.2.3 Macroinvertebrates ............................................................................................................... 25 5.2.4 Fish ....................................................................................................................................... 26 5.2.5 Data analysis ........................................................................................................................ 26 5.3 Results and Discussion ................................................................................................................. 27 5.3.1 Water quality – univariate analyses ..................................................................................... 27 5.3.2 Water quality - multivariate patterns ..................................................................................... 34 5.3.3 Macroinvertebrates – taxonomy and conservation significance .......................................... 35 5.3.4 Macroinvertebrates – univariate analyses ............................................................................ 36 5.3.5 Macroinvertebrates - multivariate patterns in species assemblages ................................... 38 5.3.6 AusRivAS trigger values ....................................................................................................... 39 5.3.7 Fishes - taxonomy and conservation significance................................................................ 41 5.3.8 Fishes – univariate analyses ................................................................................................ 43 5.3.9 Fishes – multivariate patterns in species assemblages ....................................................... 45 5.4 Conclusions ................................................................................................................................... 47 6 REFERENCES ................................................................................................................................... 50 7 APPENDICES ..................................................................................................................................... 53 Appendix 1 Site Photographs ...............................................................................................................
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