Title

Native Vegetation - Modelled 2005 Ecological Vegetation Classes (with Bioregional Conservation Status) 

Alternate title

NV2005_EVCBCS 

Purpose

A Bioregional Conservation Status of vegetation types (Ecological Vegetation Classes) has been assigned to support the management of biodiversity values in Victoria. The dataset identifies unique combinations of Victorian bioregions and extant EVCs which have been assigned a conservation status rating. The dataset underpins the implementation of Victoria's Native Vegetation Management Framework which defines how the Bioregional Conservation Status of an EVC is used in determining the conservation significance for biodiversity purposes, and management implications. The layer will primarily support flora and fauna biodiversity evaluations and management. The layer is used to define National Vegetation Information System (NVIS) units (ie. a Bioregion-EVC combination equates to a unique NVIS description) NVIS descriptions are managed in the Victorian Vegetation Information System (VicVIS). 

Credit

David Parkes Stephen Farrell Fiona Ferwerda Alison Oates Luong Tran 

Supplemental Information

Relationship to other Datasets: The dataset is derived from a combination of Victorian bioregions (VBIOREG100), the pre 1750 EVC dataset (NV1750_EVC) and the current extent of native vegetation (NV2005_EXTENT), with an assigned conservation status on the basis of unique Bioregion EVC units. The boundaries and key attributes from both datasets are found in this derived dataset. This dataset is part of a series of native vegetation datasets, which have the following naming convention - NV{year}-ATTRIBUTE(s): NV2005_EXTENT - Modelled extent of native vegetation (very broad categories) NV1750_EVC - Mapped pre 1750 ecological vegetation classes (EVCs) distribution NV1750_EVCBCS - Mapped pre1750 EVC distribution with Bioregional Conservation Status derived from NV1750_EVC and VBIOREGION100 and depletion statistics, also contains pre1750 geographic occurrence of EVCs NV2005_EVCBCS - Extant EVC distribution with Bioregional Conservation Status derived from NV1750_EVCBCS and NV2005_EXTENT , also contains pre1750 geographic occurrence NV2005_QUAL - Modelled Native Vegetation Quality - includes modelled site condition and patch-based landscape context NV2005_LSIMP - Landscape Scale native vegetation importance and connectivity derived from NV2005_EVCBCS, NV2005_QUAL and landscape connectivity Current Design Issues: The layer design supports the assignment of the Bioregional Conservation Status of EVCs that is assigned to unique combinations of Victorian Bioregions and EVCs. The dataset also identifies the Geographic Occurrence of EVCs at a Bioregional level which is assigned on the same basis. Since most users will require information about the EVC and Bioregion in addition to the Bioregional Conservation Status rating, most EVC and Victorian Bioregion dataset attributes have been retained in the dataset. Since a number of different types of vegetation are included in the extant EVC dataset, an additional Map Unit Type field has been provided to advise users of where and why Bioregional Conservation Status and Geographic Occurence are not relevant. Related Documents: An Interim Biogeographic Regionalisation for Australia: a framework for establishing the national system of reserves, Version 4.0. - R. Thackway and I.D.Cresswell (1995) (eds) Australian Nature Conservation Agency, Canberra. Peel, B (in prep) A Typology for Vegetation in Victoria: towards a census of Victorian plant communities, NRE, Melbourne. EVC Benchmark descriptions on the DSE external website (dse.vic.gov.au) Metadata for NV1750_EVC, NV2005_EXTENT and VBIOREG100 

Status

Completed  

Horizontal Accuracy

100m  

Code

4283 

Maintenance and update frequency

As needed  

Topic category

• Biota

Use limitation

. This is a landscape scale dataset, site verification is required for site based projects Planning or investment decisions at the site-scale should use some form of ground-truthing. 

Classification

Unclassified  

Statement

Dataset Source: This is a derived dataset see source datasets for history. When any of the source datasets change this dataset is rederived. The dataset is derived from a combination of Victorian bioregions (VBIOREGION100), Pre 1750 EVCS (NV1750_EVC) and the current extent of Native Vegetation (NV2005_EXTENT).Bioregional conservation status & geographic occurrence is applied to unique Bioregion EVC units. The boundaries and key attributes from the source datasets are found in this derived dataset. The key attributes, Bioregional Conservation Status (EVC_BCS) and Geographic Occurrence (EVC_GO) of EVCs, have been assigned to Bioregion/EVC combinations on the basis of an expert interpretation of statistical and spatial information by Alison Oates & David Parkes, Biodiversity & Ecosystem Services, DSE with the support of other DSE staff. The source information for these two attributes is maintained in a separate database that is linked to the NV1750_EVC/NV2005_EXTANT/VBIOREG100 combination dataset to create NV2005_EVCBCS. The source table is maintained by Biodiversity & Ecosystem Services The approach to assessing bioregional conservation status and geographic occurrence of vegetation types (Ecological Vegetation Classes) is described in Appendix 2 of DSE's, 'Victorias Native Vegetation Management - A Framework for Action', 2002. Dataset Originality: Derived 

Description

NV1750_EVC is intersected with VBIOREGION100 and with NV2005_EXTANT, and Bioregional Conservation and Geographic Occurrence attributes are populated for each Bioregion-EVC combination 

Classification

Unclassified  

Attribute Quality

Comments

Refer to metadata for input datasets 

Positional Accuracy

Comments

Refer to metadata for input datasets 

Conceptual Consistency

Comments

There is a logical consistency between combinations of Victorian Bioregions and EVCs and the assigned Bioregional Conservation Status (EVC_BCS) and Geographic Occurrence (EVC_GO) of EVC attributes. There is a logical consistency between bioregion numbers, codes and names, and between EVC numbers and names. 

Missing Data

Comments

The dataset is complete for the whole state, however will require updating when any of the three input datasets change. 

Excess Data

Comments

erratum - The following BioEVCs have been incorrectly attributed for BCS in the current version of the dataset (March 2008). In all cases BCS should be changed from Least Concern to Rare HSF_0027 (Blackthorn Scrub), EGU_0028 (Rocky Outcrop Shrubland), HFE_0028 ( Rocky Outcrop Shrubland), HNF_0028 (Rocky Outcrop Shrubland), EGU_0073 (Rocky Outcrop Shrubland/Rocky Outcrop Herbland Mosaic), HSF_0073 (Rocky Outcrop Shrubland/Rocky Outcrop Herbland Mosaic), EGL_0028 (Rocky Outcrop Shrubland)