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Flood Plain Lower Ringarooma River Ramsar site Ecological Character Description March 2012 Blank page Citation


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Knowledge Gaps


The key knowledge gaps for the site include systematically collected data for all the critical components. Data should be gathered using standard methods that allow derivation of a ’point-in-time’ baseline which can be compared to future monitoring programs. Therefore, the initial sampling strategy must be designed in a way that allows repeatability (see section 8, below). The data should also be gathered using approaches and methods that allow comparison with other data sets within Tasmania and the rest of Australia.

Data and information available for most components of the site are poor. The vegetation has been recently mapped for a considerable portion of the site (DPIW 2006). However, a supplementary survey of the remaining areas would allow a more complete assessment of the site’s vegetation biodiversity, habitat heterogeneity and rare species. Quantitative faunal surveys for mammal, amphibian, reptile and bird abundances and distributions are required to provide adequate baseline assessments for future comparisons. Fish communities in fresh, estuarine and marine environments underpin much of the components of this site and these populations need to be understood with baseline assessment and then monitored regularly to improve our understanding of their role in this ecosystem.

Examples of the information types required are presented in Table 14. Priorities for knowledge gaps were established by considering the critical components which face the highest threat. The key knowledge gaps required to support the critical components fall into seven broad component categories:


  • hydrology

  • geomorphology

  • water quality

  • vegetation

  • fauna

  • habitat

  • substrate

Knowledge of these areas will allow a detailed understanding of the vegetation communities of the site which are structured by the hydrology, geomorphology and water quality. The vegetation communities have their own intrinsic value and also provide habitat to the frogs, fish and birds of the site.

Table 14: Knowledge gaps for the Flood Plain Lower Ringarooma Ramsar site.



Information requirement

Identified Knowledge Gaps

Recommended Monitoring or other action to address the gap.

Priority

Hydrology

Inundation records for each wetland not available, including aerial coverage and depths over time.

Remote sensing or aerial photos of wetland extent over time, followed-up with ground truthing and depth measurements.

High

Rates of flows filling wetlands.

Gauge information.

Medium

Contributions from groundwater are not yet quantified.

Monitor groundwater levels.

Low

Geomorphology

Annotated geomorphic map across site, with descriptions of landforms and ongoing geomorphic processes (includes sediment movement from freshwater zone to estuary zone.

Geomorphic mapping survey of site, incorporating information from aerial photographs and including cross-sections. Strong focus on areas of active sand deposition and recently vegetated areas, with sufficient frequency to determine rates of change.

High

Sediment deposition volume.

Sediment volume measurement and calculations.

High

Water Quality

Baseline water quality data for the freshwater zone and estuary zone.

Monthly monitoring program for at least two years, including inputs from discharge drains and other identifiable sources.

High

Storm-event water quality data for the freshwater zone and estuary zone.

Storm-event sampling for wetland systems, including inputs from discharge drains.

Medium

Vegetation

Complete vegetation map of site, consistent with TASVEG survey program.

Undertake vegetation survey to complement/supplement DPIW 2006 non-forest veg survey, includes species lists and distributions across site.

High

Extensive map of rare floral species across site.

Location map of vulnerable, rare or threatened species with information on habitat preferences and tolerances.

High

Fauna

Data base of faunal distributions across site.

Systematic faunal surveys across site, including but not limited to: fish; mammals; birds; aquatic macroinvertebrates and amphibians, especially targeting fauna species with likely potential habitat in the site such as New Holland Mouse, Eastern barred bandicoot and Giant Freshwater Crayfish. Also to provide information on habitat preferences and tolerances and infectious disease status.

High

Extensive map of rare faunal species across site.

Location map of vulnerable, rare or threatened species with information on habitat preferences and tolerances.

High

Habitat

Map of habitats across site, with particular reference to vulnerable, rare or threatened species’ requirements.

Prepare habitat map based on vegetation and geomorphic maps, aerial photographs and using habitat preferences and requirements of identified species.

High

Substrate

Map of substrate with particular reference natural vs. impacted condition.

Survey of substrate, with representation of areas with high stock access. Measurement criteria to include colour, texture and structure, as well as measures of impacts.

Medium


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