Oral Presentation Australian Society for Limnology Conference 2016

A DST for evaluating the likelihood of wetland vegetation recovery being successful (#98)

Jane Roberts 1
  1. Ecological Consultant, O'CONNOR, ACT, Australia

A recent review on vegetation recovery for inland wetlands in Australia (Roberts, Casanova, Morris and Papas, 2016, in press) noted there has been a huge grass-roots effort in this area since the 1980s.  The review also noted a chronic lack of case histories, retrospective evaluations, and conceptual framework.  This lack of documentation was recognised as a constraint in improving on-ground practices.  The decision-support tool presented here uses a conceptual framework of vegetation recovery that was specifically developed as part of that review, and its purpose is to improve on-ground practice and increase success rate.  Target users are individuals or groups planning wetland recovery (NRM agencies, NGOs, individuals, landholders) and managers considering whether or not a funding proposal is soundly based.  The tool is in the form of a decision tree (DT) with an accompanying User Guide.  It evaluates the likelihood of successfully achieving a specific outcome for a particular wetland.  The tree is structured as a set of seven questions, covering three topics important in vegetation dynamics and recovery:  site conditions (abiotic considerations), regeneration potential (vegetation attributes), and establishment conditions (biotic interactions).  The evaluation is done by comparing what the site offers as a habitat for vegetation (current, or proposed future) with what the vegetation type needs for growth and sustained persistence.  This requires that the User selects a priori one of five objectives for the wetland, and one vegetation type for the wetland.  The decision tree can be used as a single pass to evaluate a proposal, or iteratively to refine a proposal, and so learn and improve. The development of this decision tree in Victoria has been greatly facilitated by resource materials such as a wetland regionalisation, and wetland vegetation typology wiht banchmarks, but the principles and the approach have a wider application.