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Interlaken Lakeside Reserve Wetland Vegetation Survey

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Interlaken Lakeside Reserve Wetland Vegetation Survey Interlaken Lakeside Reserve – Wetland Vegetation Survey Water Assessment Aquatic Ecology Report Series Interlaken Lakeside Reserve Wetland Vegetation Survey August 2010 ISSN: 1835-9523 Report No. WA 10/04 Water Assessment Branch Water and Marine Resources Division 0 Department of Primary Industries, Parks, Water and Environment Interlaken Lakeside Reserve – Wetland Vegetation Survey Copyright Notice: Material contained in the report provided is subject to Australian copyright law. Other than in accordance with the Copyright Act 1968 of the Commonwealth Parliament, no part of this report may, in any form or by any means, be reproduced, transmitted or used. This report cannot be redistributed for any commercial purpose whatsoever, or distributed to a third party for such purpose, without prior written permission being sought from the Department of Primary Industries, Parks, Water and Environment, on behalf of the Crown in Right of the State of Tasmania. Disclaimer: Whilst DPIPWE has made every attempt to ensure the accuracy and reliability of the information and data provided, it is the responsibility of the data user to make their own decisions about the accuracy, currency, reliability and correctness of information provided. The Department of Primary Industries, Parks, Water and Environment, its employees and agents, and the Crown in the Right of the State of Tasmania do not accept any liability for any damage caused by, or economic loss arising from, reliance on this information. Prepared By: Danielle Hardie, Kate Hoyle and Scott Hardie. Preferred Citation: DPIPWE. (2010). Interlaken Lakeside Reserve Wetland Vegetation Survey. Water Assessment Aquatic Ecology Report Series, Report No. WA 10/04. Water and Marine Resources Division. Department of Primary Industries, Parks, Water and Environment, Hobart, Tasmania. Contact Details: Department of Primary Industries, Parks, Water and Environment Water Assessment Branch 13 St Johns Avenue, New Town, Tasmania. Phone: 03 6233 6833 Web: www.dpipwe.tas.gov.au Email: [email protected] Cover Page Image: Interlaken Lakeside Reserve wetland showing Triglochin procerum in flower (Photo: D. Hardie) The Department of Primary Industries, Parks, Water and Environment The Department of Primary Industries, Parks, Water and Environment provides leadership in the sustainable management and development of Tasmania’s resources. The Mission of the Department is to advance Tasmania’s prosperity through the sustainable development of our natural resources and the conservation of our natural and cultural heritage for the future. The Water and Marine Resources Division provides a focus for water management and water development in Tasmania through a diverse range of functions including the design of policy and regulatory frameworks to ensure sustainable use of the surface water and groundwater resources; monitoring, assessment and reporting on the condition of the State’s freshwater resources; facilitation of infrastructure development projects to ensure the efficient and sustainable supply of water; and implementation of the Water Management Act 1999 , related legislation and the State Water Development Plan. i Interlaken Lakeside Reserve – Wetland Vegetation Survey Summary The Interlaken Lakeside Reserve wetland is one of a number of littoral wetlands associated with Lake Crescent and Lake Sorell, and represents an important component of the Crescent-Sorell ecosystem. The water level regime of the Interlaken Lakeside Reserve wetland (i.e. the temporal pattern and spatial extent of inundation and drying) is closely linked to water levels in Lake Crescent and the interconnecting Lake Sorell. Between 1997 and 2009, an extended period of dry climatic conditions resulted in ongoing low water levels in Lake Crescent and the subsequent absence of full inundation of the Interlaken Lakeside Reserve wetland for more than 12 years. During late 2009 – early 2010, the Interlaken Lakeside Reserve wetland was inundated to the greatest extent since 1996, as a result of higher than average rainfall in 2009. Heffer (2003) undertook a comprehensive study of the wetlands around lakes Crescent and Sorell during 2000-2002. This study recommended a set of operating guidelines for the management of water levels in the lakes, aimed at maintaining or restoring appropriate water regimes for wetland vegetation communities. These guidelines were incorporated into the Lakes Sorell and Crescent Water Management Plan (DPIWE, 2005). Smith and Mendel (2009) surveyed the vegetation within the Interlaken Lakeside Reserve wetland in May 2009 as part of the ecological assessments required for the review of the Lakes Sorell and Crescent Water Management Plan. The Interlaken Lakeside Reserve remained dry at the time of this study, and therefore the survey provided a characterisation and condition assessment of the wetland vegetation community following a prolonged period without full inundation. This present study presents the results of a survey of the Interlaken Lakeside Reserve wetland vegetation undertaken in February 2010. It assesses the response of wetland vegetation to inundation during late 2009 – early 2010 following the extended dry period, and is intended to provide additional information to the review of the Lakes Sorell and Crescent Water Management Plan. Survey results were compared with those of Heffer (2003) and Smith and Mendel (2009). This study found that following inundation, the characteristics of wetland vegetation within the Interlaken Lakeside Reserve indicate a shift from a vegetation community with increased abundance of terrestrial and introduced species (Smith and Mendel, 2009) towards a community dominated by native amphibious species. However, there are still some indicators of the effect of the prolonged dry period on the wetland community, and the potential for a continued transition towards an increasingly terrestrial community will remain in the absence of a more regular pattern of inundation. Short-term colonisation of terrestrial plant species is likely to occur during drying events; however, regular inundation of the wetland is important for the ongoing persistence of amphibious and aquatic species. To encourage and maintain a high diversity of aquatic vegetation within the wetlands associated with the Crescent-Sorell system, this report recommends that an appropriate water regime can be achieved by implementing the operating guidelines related to wetlands in the current Lakes Sorell and Crescent Water Management Plan. Additional recommendations for the management of water levels in lakes Crescent and Sorell are included, and some preferred options regarding future monitoring are discussed. ii Interlaken Lakeside Reserve – Wetland Vegetation Survey Contents Summary ........................................................................................................................... ii 1 Introduction .............................................................................................................. 1 1.1 Ecological significance and conservation status ........................................................ 2 1.2 Water level regime ..................................................................................................... 3 1.3 Previous research ....................................................................................................... 5 1.4 Conditions in the Interlaken Lakeside Reserve during late 2009 – early 2010 .......... 5 1.5 Objectives................................................................................................................... 6 2 Methods .................................................................................................................... 7 2.1 Taxonomic notes ........................................................................................................ 7 2.2 Data analysis .............................................................................................................. 9 3 Results and discussion ............................................................................................. 10 3.1 Species diversity ....................................................................................................... 10 3.2 Species characterisation .......................................................................................... 11 3.3 Comparisons with previous vegetation studies ....................................................... 14 3.3.1 Water levels .................................................................................................... 14 3.3.2 Frequency of occurrence ................................................................................. 16 3.3.3 Percent cover .................................................................................................. 18 3.3.4 Plant height ..................................................................................................... 20 4 Conclusions and management recommendations .................................................... 22 5 References ............................................................................................................... 24 Appendix A – Conservation of Freshwater Ecosystem Values (CFEV) assessment of Lakes Sorell and Crescent, and surrounding areas ..................................................................... 25 Appendix B – Location and environment data for quadrats surveyed in February 2010. ... 36 Appendix C – Vegetation data collected for quadrat
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