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Hattah-Kulkyne Lakes Ramsar Site Hattah -Kulkyne Lakes Ramsar Site ecological character description Published by the Victorian Government Department of Sustainability and Environment Melbourne, August 2010 © The State of Victoria Department of Sustainability and Environment (DSE) 2010 This publication is copyright. No part may be reproduced by any process except in accordance with the provisions of the Copyright Act 1968 . Authorised by the Victorian Government, 8 Nicholson Street, East Melbourne. ISBN 978-1-74242-648-8 (online) For more information contact the DSE Customer Service Centre 136 186 This Hattah-Kulkyne Lakes Ramsar Site ecological character description was prepared in 2005 using the ‘Framework for describing the ecological character of Ramsar wetlands’ (Department of Sustainability and Environment, 2005a) which pre-dated the current National Framework and Guidance for Describing the Ecological Character of Australia's Ramsar Wetlands agreed by the Natural Resource Management Ministerial Council on 12 June 2008 (http://www.environment.gov.au/water/topics/wetlands/ramsar-convention/implementation-of-framework.html). Disclaimer The views and opinions expressed in this publication are those of the authors and do not necessarily reflect those of the Australian Government or the Minister for Environment Protection, Heritage and the Arts or the Minister for Climate Change, Energy Efficiency and Water or the Administrative Authority for Ramsar in Australia. While reasonable efforts have been made to ensure the contents of this publication are factually correct, the Commonwealth does not accept responsibility for the accuracy or completeness of the contents, and shall not be liable for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the contents of this publication. Guidance on the development of Ecological Character Descriptions, including Limits of Acceptable change, are areas of active policy development. Accordingly there may be differences in the type of information contained in this Ecological Character Description, to those of other Ramsar wetlands. This information does not create a policy position to be applied in statutory decision making. Further it does not provide assessment of any particular action within the meaning of the EPBC Act, nor replace the role of the Minister or his delegate in making an informed decision on any action. This report is not a substitute for professional advice rather it is intended to inform professional opinion by providing the authors' assessment of available evidence on change in ecological character. This information is provided without prejudice to any final decision by the Administrative Authority for Ramsar in Australia on change in ecological character in accordance with the requirements of Article 3.2 of the Ramsar Convention. Users should obtain any appropriate professional advice relevant to their particular circumstances. This report was prepared with the financial support of the Australian Government under the Natural Heritage Trust. Cover: Hattah Lakes, Mallee Catchment Management Authority. Acknowledgments The Hattah-Kulkyne Lakes Ramsar Site ecological character description was developed by Ecological Associates Pty Ltd, Malvern South Australia for the Department of Sustainability and Environment, Melbourne, Victoria with the assistance of a project steering committee. The steering committee included representatives from Victorian Government Department of Sustainability and Environment, the Australian Government Department of Environment, Water, Heritage and the Arts, the Mallee Catchment Management Authority and Parks Victoria. Hattah-Kulkyne Lakes Ramsar Site Ecological Character Description (2005) TABLE OF CONTENTS SUMMARY 1 ECOLOGICAL CHARACTER DESCRIPTION 2 1. INTRODUCTION 2 2. ECOLOGICAL CHARACTER DESCRIPTION DETAILS 2 3. ECOSYSTEM SERVICES FOR THE HATTAH -KULKYNE LAKES RAMSAR SITE 3 4. ECOSYSTEM SERVICES TO BE USED AS THE BASIS FOR THE ECOLOGICAL CHARACTER DESCRIPTION 4 5. DESCRIPTION OF ECOSYSTEM SERVICES AND IDENTIFICATION AND RELATED COMPONENTS 6 5.1 Maintains the ecological diversity of the Robinvale Plains bioregion by supporting a large number and variety of waterbirds, including breeding habitat for many species 8 5.2 Supports threatened species, including those recognised nationally or internationally 13 5.3 Supports representative wetland and floodplain EVCs that are depleted in the Robinvale Plains Bioregion 14 5.4 Supports wetlands representative of two of Victoria’s six natural wetland types and of the Robinvale Plains bioregion 17 5.5 Summary of components that maintain ecosystem services 20 6. SPECIFIED COMPONENTS 21 6.1 Hydrology 21 6.2 Vegetation Condition 25 6.3 Connectivity of surface waters 27 6.4 Floodplain topography 29 6.5 Salinity 29 7. FUTURE MONITORING OF ECOLOGICAL CHARACTER 30 REFERENCES 31 APPENDICES 33 APPENDIX A. FRECKLED DUCK DATA 33 APPENDIX B. DROUGHT REFUGE 34 APPENDIX C. THREATENED FLORA AND FAUNA 35 APPENDIX D. VICTORIAN FRESHWATER WETLAND CATEGORIES AND SUB -CATEGORIES 39 Summary This description of the ecological character of the Hattah-Kulkyne Lakes Ramsar Site was prepared using the "Framework for Describing the Ecological Character of Ramsar Wetlands" (DSE 2005a). The Hattah-Kulkyne Ramsar site was listed in 1982. The site consists of twelve lakes hydrologically connected to the Murray River and located on the river floodplain. The floodplain habitat is integral to the ecological character of the lakes that make up the Ramsar site. The ecological character description includes information both for the Ramsar site and the floodplain surrounding the lakes (here called the Hattah floodplain), where relevant. The description is based on four ecosystem services as follows. • The site maintains the ecological diversity of the Robinvale Plains bioregion by supporting a large number and variety of waterbirds, including breeding habitat for many waterbird species. • The site supports representative wetland and floodplain EVCs that are depleted in the Robinvale Plains bioregion. • The site supports wetlands representative of two of Victoria's six natural wetland types and of the Robinvale Plains bioregion, including a depleted wetland type. • The site supports threatened species, including those recognised nationally and internationally. Data were unavailable to specify many ecosystem services and components at the time of listing in 1982 so more recent data was used to quantify a baseline for ongoing monitoring of ecosystem services. Waterbird presence and abundance data were available from 1982 onwards but not for the period leading up to listing. Comprehensive data were not available to specify waterbird breeding. Comprehensive vegetation mapping was not available until 2003. Wetland classification and mapping was undertaken in 1993. Available threatened species records were generally from opportunistic sightings rather than systematic surveys. For ecosystem services, an ecological character monitoring program should include continued annual monitoring of waterbird presence and abundance, monitoring of waterbird breeding events, systematic monitoring of threatened species (especially those threatened nationally) and longer term monitoring designed to detect changes in the distribution of ecological vegetation classes and change in wetland categories. The components identified as critical in maintaining the ecosystem services were hydrology, vegetation condition, connectivity of surface waters, floodplain topography and salinity of water entering the lakes. Salinity data is routinely collected in the Murray River at Euston and this should continue. Long-term mean daily flow data for the Murray River at Euston were available and continue to be recorded. Some information was available to determine the flooding requirements for waterbirds and wetland vegetation. However, systematic monitoring is required to increase certainty about the flooding regime required to maintain these aspects of ecological character. More information is required to understand water connectivity within the lake system, particularly thresholds for flow to the lakes. The floodplain topography digital elevation model completed in 2005 provides a baseline for assessing future changes to floodplain topography. It also provides the basis for development of a hydraulic model of the Ramsar site lakes and surrounding Hattah floodplain which could be used to improve understanding of flood thresholds, flooding patterns and the flooding requirements for waterbirds and wetland vegetation. Data on grazing pressure have been collected for several years and provide an indirect measure of vegetation condition. Monitoring should continue. In addition, it is recommended that condition assessments be made of ecological vegetation classes (EVCs) in the Ramsar site and on the Hattah floodplain to establish a benchmark for future reference. A program should be developed to monitor the condition of EVCs in the future. 1 Ecological character description 1. Introduction This description was prepared using the “Framework for Describing the Ecological Character of Ramsar Wetlands” (DSE 2005a). It follows the approach recommended in the framework which consists of a series of steps as set out below. 1. Document introductory details about the description of ecological character. 2. List the ecosystem services at the Ramsar site. 3. Select ecosystem services for the ecological character description. 4. Define the selected ecosystem services in specific terms.
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