Native Vegetation - glossary
EVCs have been arranged by bioregions, which are a landscape-scale approach to classifying the environment using a range of attributes such as climate, geomorphology, geology, soils and vegetation. There are 28 bioregions identified within Victoria.
Bioregional Conservation Status (BCS)
An assessment of the conservation status of the native vegetation type (EVC) in the context of a particular bioregion, taking account of how commonly it originally occurred, the current level of depletion and the level of degradation of condition typical of remaining stands.
Ecological Vegetation Class (EVC)
A hierarchical system of classification of plant communities has been developed in Victoria over the past decade in order to classify vegetation into units that are both ecologically meaningful and useful for natural resource managers. The classification that has been adopted in Victoria includes Ecological Vegetation Classes (EVCs) which are defined by a combination of floristics, lifeform, position in the landscape, and an inferred fidelity to particular environments. Each EVC includes a collection of floristic communities (i.e. groups based on co-occurring plant species) that occur across a biogeographic range, and although differing in species, have similar habitat and ecological processes operating. Approximately 300 EVCs have been described for Victoria.
EVC benchmarks have been developed as standard vegetation-quality reference points that are applied in carrying out vegetation quality assessments. Represents the average characteristics of a mature and apparently long-undisturbed stand of the same vegetation type.
A site based measure of quality and quantity of native vegetation that is assessed in the context of the relevant native vegetation.
Index of Wetland Condition
The Index of Wetland Condition (IWC) is designed for naturally-occurring wetlands without a marine hydrological influence. The IWC includes a measure to assess the quality of wetland vegetation in the wetland Ecological Vegetation Class. IWC is based on an adaptation of the Habitat Hectare model more suited to scoring wetland vegetation.
A mapping unit is an area mapped at 1:100 000, that includes one or more Ecological Vegetation Class (EVC) . Where there are more than one EVC the mapping unit, the unit may be called a mosaic, complex or an aggregate. In general, these mapping units have been established because finer resolution of the vegetation could not be achieved at the scale of mapping.
EVC aggregate - The term aggregate is applied to an EVC mapping label where the EVC represents a generalised label for wetlands occurring within a given ecological context (e.g. saline, brackish or freshwater lakes; billabongs; mineralised drainage-lines on grey-clay basalt derived soils). While the range of EVCs, which can be variously expressed in these situations, can be determined, the scale and intricacy can be prohibitive to resolution of the component EVCs, especially for the purpose of broader-scale mapping.
EVC complex - EVC complexes are mapping units with influences of two or more defined EVCs that cannot be differentiated at the site scale.
EVC mosaic - EVC mosaics are mapping units containing two or more defined EVCs that cannot be differentiated at the scale of mapping.
EVC 'variants' - Variants of an EVC are sometimes used in the bioregional benchmarks. This is necessary where variants of an EVC containing different life form characteristics and occupying different environments are known to exist within a bioregion. This is indicated by the code "_61", "_62" etc. after the EVC number in the EVC benchmark list.
EVC generic - A generic mapping unit largely based on the Departments pre-1750 wetland mapping layer (wet_1788) and that was used in some of the early EVC mapping in Victoria. This will be progressively be replaced following the recent revision of the statewide EVC wetland typology. A generic wetland lookup table provides information on the component EVCs that may be found within each of the generic wetland mapping units.Simplified Native Vegetation Groups
Similar Ecological Vegetation Classes (EVC) have been assigned to a simplified native vegetation group. Some groups have be further divided into sub-groups for more convenient management and illustration of statewide data. There are 20 simplified native vegetation groups with a total of 35 sub-groups.