Overall Biodiversity Values of the Greater Weddell Subregion, 2025

Index:

Metadata
Citation
Description

Dataset Status
Data Quality
Contact Information
Data Dictionary
Supplementary Information

Metadata Details:

Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile

Version:1.0

Date Metadata Extracted:2025-06-23

Date Metadata Last Updated:2025-05-22

Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34986176C1A45645E0632144CD9B4825

Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=34986176C1A45645E0632144CD9B4825

Citation

ANZLIC Identifier:34986176C1A45645E0632144CD9B4825

Title:Overall Biodiversity Values of the Greater Weddell Subregion, 2025

Citation Date:2025-05-08

Date Type:creation

Custodian:Department of Environment, Parks and Water Security

Description

Abstract:

Polygon data presenting overall biodiversity values in the Greater Weddell subregion.

Biodiversity values across the study area include sensitive and/or significant vegetation communities and threatened and significant flora and fauna. These values were identified and assessed to derive and map overall biodiversity values across the study area.

Broadly delineated areas of high value for threatened mammals and priority conservation areas for Typhonium praetermissum are also presented in the datasets:
- Typhonium praetermissum Priority Conservation Areas in the Greater Weddell Subregion, 2025 (http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34AF242C521E4921E0632144CD9B62EE )
- High Value Habitat for Threatened Mammals in the Greater Weddell Subregion, 2025 (http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34AD962B2D57EB9EE0632144CD9B130B )

Produced as part of the biodiversity assessment of the Greater Weddell subregion, 2025.
The biodiversity assessment study area covers approximately 39,422 ha and is located approximately 13 km south of Darwin.

ANZLIC Search Words:

biota

environment

Spatial Domain:

Bounding Coordinates:

North Bounding Coordinate:-12.532485

South Bounding Coordinate:-12.766766

East Bounding Coordinate:131.168234

West Bounding Coordinate:130.779704

Dataset Status

Dataset ID:

Language:English

Character Set: Latin 1

Progress:completed

Maintenance and Update Frequency:notPlanned

Data Currency Start Date:2025-05-08

Data Currency End Date:2025-05-08

Access Constraint:Download the spatial data package via data.nt.gov.au/
You are licensed to use this publication on the terms and conditions set out in: Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at: creativecommons.org/licenses/by/4.0/legalcode
If you do not agree to the terms and conditions you must not use this publication.
You are free to copy, communicate and adapt the licensed material, provided that you abide by the licence terms (including Attribution) and attribute the licensed material using the statement:
Supplied by the Department of Lands, Planning and Environment. Copyright Northern Territory Government.

Data Quality

Lineage:Overall Biodiversity Values is a compilation and synthesis of spatial data derived during the biodiversity assessment of the Greater Weddell subregion, with attributes summarised to include only those described below in the data dictionary.

Spatial data contributing to the overall biodiversity values synthesis includes:
- Areas Predicted to Contain Stands of Large Trees with Hollows Suitable for Fauna in the Greater Weddell Subregion, 2025
- Cycas armstrongii Survey Sites in the Greater Weddell Subregion, 2025
- Density of Critical Weight Range Mammal Records in the Greater Weddell Subregion, 2025
- Fauna Inventory and Camera Trap Sites for the Biodiversity Assessment of the Greater Weddell Subregion, 2025
- Habitat Quality Models for Critical Weight Range Mammals in the Greater Weddell Subregion, 2025
- High Value Habitat for Threatened Mammals in the Greater Weddell Subregion, 2025
- Predicted Distribution of High Density Cycas armstrongii Stands in the Greater Weddell Subregion, 2025
- Predicted Distribution of Suitable Habitat for Stylidum ensatum in the Greater Weddell Subregion, 2025
- Study Area for the Biodiversity Assessment of the Greater Weddell Subregion, 2025
- Survey Sites for Stands of Large Trees with Hollows Suitable for Fauna in the Greater Weddell Subregion, 2025
- Threatened and Significant Flora Records in the Greater Weddell Subregion, 2025
- Threatened Fauna Records in the Greater Weddell Subregion, 2025
- Typhonium praetermissum Priority Conservation Areas in the Greater Weddell Subregion, 2025
- Uperoleia daviesae Survey Sites for the Biodiversity Assessment of the Greater Weddell Subregion, 2025
- Vegetation Map for the Biodiversity Assessment of the Greater Weddell Subregion, 2025

Further details are provided in the report listed in Supplementary Information.

Positional Accuracy:

Attribute Accuracy:Attribute values are assigned to each polygon and described in the Data Dictionary below

Logical Consistency:GIS editing tools were used to rectify all overshoots and undershoots in line work. Polygon topology rules applied: must not overlap, must not have gaps and each polygon has only one label.

Completeness:Completed.

Contacts

Name Organisation Position Role Phone Fax Email

Data Requests Officer Department of Environment, Parks and Water Security Geospatial Services Branch (on behalf of department) distributor datarequests.depws@nt.gov.au

Name	Organisation	Position	Role	Phone	Fax	Email
Data Requests Officer	Department of Environment, Parks and Water Security	Geospatial Services Branch (on behalf of department)	distributor			datarequests.depws@nt.gov.au

Data Dictionary

Attribute Attribute Description Possible Code Code Description

BV_ATBR Biodiversity values for Atalaya brevialata in the study area. Medium Potentially suitable habitat (Cuff and Green 2016) not previously surveyed to determine presence or absence.

ND Biodiversity value not defined.

Very high Minimum convex polygon around each known population, buffered by 250 m.

BV_CLIN Biodiversity values for Cleome insolata in the study area High The extent of each mapped patch of habitat containing presence records.

Medium All patches of sandsheet heath where the species is currently unrecorded.

ND Biodiversity value not defined.

BV_GRLO Biodiversity values for Grevillea longicuspis in the study area. Medium All patches of map unit WV_19a

ND Biodiversity value not defined.

BV_LGETREES In the context of the Weddell sub-region, biodiversity values for areas predicted to contain stands of large trees with hollows suitable for fauna. Low All other areas (patch size less than 100 ha).

Medium All patches >100 ha in area.

ND Biodiversity value not defined.

BV_MANG All mangrove communities in Darwin Harbour are considered to be of high biodiversity value. High All mangrove communities in Darwin Harbour are considered to be of high biodiversity value.

ND Biodiversity value not defined.

BV_OVERALL Overall biodiversity value High High biodiversity value overall.

Highly modified area Includes areas mapped as intensive land use, including agriculture and plantations, or rural residential. Some areas are completely converted and have no significant biodiversity value, although they may contain historical records of threatened species. Areas mapped as rural residential may retain a proportion of native vegetation and have residual value to significant flora and fauna.

Low Native vegetation that was not identified as Medium, High or Very high value and is not mapped as highly modified.

Medium Medium biodiversity value overall.

Very high Very high biodiversity value overall.

BV_RAIN In the context of the Weddell sub-region, biodiversity values for rainforest in the study area. High All patches of wet monsoon rainforest, and larger patches (>70 ha) of dry monsoon rainforest.

Medium All other dry monsoon rainforest.

ND Biodiversity value not defined.

BV_RIPWET In the context of the Weddell sub-region, all riparian areas and wetlands (that are not also sandsheet heath or mangroves) are of medium biodiversity value. Medium In the context of the Weddell sub-region, all riparian areas and wetlands (that are not also sandsheet heath or mangroves) are of medium biodiversity value.

ND Biodiversity value not defined.

BV_SPPH Biodiversity values for Spermacoce phalloides in the study area. Medium All mapped patches of habitat with presence records.

ND Biodiversity value not defined.

BV_SSH In the context of the Weddell sub-region, biodiversity values for sandsheet heath in the study area. High All patches of Melaleuca nervosa low open woodland (map unit WV_13), consistent with the approach of Liddle et al (2013).

Medium All other sandsheet heath (Grevillea pteridifolia low open woodland and Melaleuca viridiflora low open woodland map units.

ND Biodiversity value not defined.

BV_STEN Biodiversity values for Stylidium ensatum in the study area Medium Areas predicted by species distribution modelling as highly suitable habitat, but where the species is currently unrecorded.

ND Biodiversity value not defined.

Very high Minimum convex polygon around known populations, buffered by 250 m.

BV_TYCP Biodiversity values for Typhonium sp. Cox Peninsula in the study area High The extent of each mapped patch of habitat containing presence records.

Medium Areas predicted by species distribution modelling for T. praetermissum as highly suitable habitat.

ND Biodiversity value not defined.

BV_TYJO Biodiversity values for Typhonium johnsonianum in the study area. Medium All mapped patches of habitat with presence records.

ND Biodiversity value not defined.

BV_TYPR Biodiversity values for Typhonium praetermissum in the study area High value Areas predicted by species distribution modelling as highly suitable habitat occurring within five priority areas delineated in the draft T. praetermissum conservation strategy (Hill et al. in prep.).

Medium Areas predicted by species distribution modelling as highly suitable habitat.

ND Biodiversity value not defined.

BV_TYTA Biodiversity values for Typhonium taylorii in the study area. Medium All patches of sandsheet heath where the species is currently unrecorded.

ND Biodiversity value not defined.

Very high All records, buffered by 250 m.

BV_UPEDAV Biodiversity values for Uperoleia daviesae in the study area. High All SSV (excluding mangroves and rainforest) occurring within 250 m of a presence record.

Medium All SSV (excluding mangroves and rainforest) occurring within the sub catchment of a presence record.

ND Biodiversity value not defined.

BV_UTDUNS Biodiversity values for Utricularia dunstaniae in the study area. High The extent of each mapped patch of habitat containing presence records.

Medium All patches of sandsheet heath map unit WV_13 where the species is currently unrecorded.

ND Biodiversity value not defined.

BV_UTSING Biodiversity values for Utricularia singeriana in the study area. High The extent of each mapped patch of habitat containing presence records.

Medium All patches of potentially highly suitable habitat in sandsheet heath, palustrine wetland, and drainage depressions where the species is currently unrecorded.

ND Biodiversity value not defined.

PROJECT Project name

VEGMAP_COMM Description of the dominant vegetation community as per the Vegetation Map for the Biodiversity Assessment of the Greater Weddell Subregion, 2025 (Metadata: http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34AF242C521F4921E0632144CD9B62EE). The vegetation mapping informed defining the overall biodiversity value (BV_OVERALL) classification of some areas as either 'Low' or 'Highly modified area'.

VEGMAP_DISPLAY Attribute to symbolise/display vegetation mapping as per the Vegetation Map for the Biodiversity Assessment of the Greater Weddell Subregion, 2025 (Metadata: http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34AF242C521F4921E0632144CD9B62EE). The vegetation mapping informed defining the overall biodiversity value (BV_OVERALL) classification of some areas as either 'Low' or 'Highly modified area'. Sandsheet heath

Drainage depression

Dry rainforest

Eucalyptus woodland

Intensive land use

Mangroves and salt flats

Mixed species shrublands and woodlands

Riparian

Wet rainforest

Wetland

Attribute	Attribute Description	Possible Code	Code Description
BV_ATBR	Biodiversity values for Atalaya brevialata in the study area.	Medium	Potentially suitable habitat (Cuff and Green 2016) not previously surveyed to determine presence or absence.
		ND	Biodiversity value not defined.
		Very high	Minimum convex polygon around each known population, buffered by 250 m.
BV_CLIN	Biodiversity values for Cleome insolata in the study area	High	The extent of each mapped patch of habitat containing presence records.
		Medium	All patches of sandsheet heath where the species is currently unrecorded.
		ND	Biodiversity value not defined.
BV_GRLO	Biodiversity values for Grevillea longicuspis in the study area.	Medium	All patches of map unit WV_19a
		ND	Biodiversity value not defined.
BV_LGETREES	In the context of the Weddell sub-region, biodiversity values for areas predicted to contain stands of large trees with hollows suitable for fauna.	Low	All other areas (patch size less than 100 ha).
		Medium	All patches >100 ha in area.
		ND	Biodiversity value not defined.
BV_MANG	All mangrove communities in Darwin Harbour are considered to be of high biodiversity value.	High	All mangrove communities in Darwin Harbour are considered to be of high biodiversity value.
		ND	Biodiversity value not defined.
BV_OVERALL	Overall biodiversity value	High	High biodiversity value overall.
		Highly modified area	Includes areas mapped as intensive land use, including agriculture and plantations, or rural residential. Some areas are completely converted and have no significant biodiversity value, although they may contain historical records of threatened species. Areas mapped as rural residential may retain a proportion of native vegetation and have residual value to significant flora and fauna.
		Low	Native vegetation that was not identified as Medium, High or Very high value and is not mapped as highly modified.
		Medium	Medium biodiversity value overall.
		Very high	Very high biodiversity value overall.
BV_RAIN	In the context of the Weddell sub-region, biodiversity values for rainforest in the study area.	High	All patches of wet monsoon rainforest, and larger patches (>70 ha) of dry monsoon rainforest.
		Medium	All other dry monsoon rainforest.
		ND	Biodiversity value not defined.
BV_RIPWET	In the context of the Weddell sub-region, all riparian areas and wetlands (that are not also sandsheet heath or mangroves) are of medium biodiversity value.	Medium	In the context of the Weddell sub-region, all riparian areas and wetlands (that are not also sandsheet heath or mangroves) are of medium biodiversity value.
		ND	Biodiversity value not defined.
BV_SPPH	Biodiversity values for Spermacoce phalloides in the study area.	Medium	All mapped patches of habitat with presence records.
		ND	Biodiversity value not defined.
BV_SSH	In the context of the Weddell sub-region, biodiversity values for sandsheet heath in the study area.	High	All patches of Melaleuca nervosa low open woodland (map unit WV_13), consistent with the approach of Liddle et al (2013).
		Medium	All other sandsheet heath (Grevillea pteridifolia low open woodland and Melaleuca viridiflora low open woodland map units.
		ND	Biodiversity value not defined.
BV_STEN	Biodiversity values for Stylidium ensatum in the study area	Medium	Areas predicted by species distribution modelling as highly suitable habitat, but where the species is currently unrecorded.
		ND	Biodiversity value not defined.
		Very high	Minimum convex polygon around known populations, buffered by 250 m.
BV_TYCP	Biodiversity values for Typhonium sp. Cox Peninsula in the study area	High	The extent of each mapped patch of habitat containing presence records.
		Medium	Areas predicted by species distribution modelling for T. praetermissum as highly suitable habitat.
		ND	Biodiversity value not defined.
BV_TYJO	Biodiversity values for Typhonium johnsonianum in the study area.	Medium	All mapped patches of habitat with presence records.
		ND	Biodiversity value not defined.
BV_TYPR	Biodiversity values for Typhonium praetermissum in the study area	High value	Areas predicted by species distribution modelling as highly suitable habitat occurring within five priority areas delineated in the draft T. praetermissum conservation strategy (Hill et al. in prep.).
		Medium	Areas predicted by species distribution modelling as highly suitable habitat.
		ND	Biodiversity value not defined.
BV_TYTA	Biodiversity values for Typhonium taylorii in the study area.	Medium	All patches of sandsheet heath where the species is currently unrecorded.
		ND	Biodiversity value not defined.
		Very high	All records, buffered by 250 m.
BV_UPEDAV	Biodiversity values for Uperoleia daviesae in the study area.	High	All SSV (excluding mangroves and rainforest) occurring within 250 m of a presence record.
		Medium	All SSV (excluding mangroves and rainforest) occurring within the sub catchment of a presence record.
		ND	Biodiversity value not defined.
BV_UTDUNS	Biodiversity values for Utricularia dunstaniae in the study area.	High	The extent of each mapped patch of habitat containing presence records.
		Medium	All patches of sandsheet heath map unit WV_13 where the species is currently unrecorded.
		ND	Biodiversity value not defined.
BV_UTSING	Biodiversity values for Utricularia singeriana in the study area.	High	The extent of each mapped patch of habitat containing presence records.
		Medium	All patches of potentially highly suitable habitat in sandsheet heath, palustrine wetland, and drainage depressions where the species is currently unrecorded.
		ND	Biodiversity value not defined.
PROJECT	Project name
VEGMAP_COMM	Description of the dominant vegetation community as per the Vegetation Map for the Biodiversity Assessment of the Greater Weddell Subregion, 2025 (Metadata: http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34AF242C521F4921E0632144CD9B62EE). The vegetation mapping informed defining the overall biodiversity value (BV_OVERALL) classification of some areas as either 'Low' or 'Highly modified area'.
VEGMAP_DISPLAY	Attribute to symbolise/display vegetation mapping as per the Vegetation Map for the Biodiversity Assessment of the Greater Weddell Subregion, 2025 (Metadata: http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=34AF242C521F4921E0632144CD9B62EE). The vegetation mapping informed defining the overall biodiversity value (BV_OVERALL) classification of some areas as either 'Low' or 'Highly modified area'.	Sandsheet heath
		Drainage depression
		Dry rainforest
		Eucalyptus woodland
		Intensive land use
		Mangroves and salt flats
		Mixed species shrublands and woodlands
		Riparian
		Wet rainforest
		Wetland

Supplementary Information

BIBLIOGRAPHIC REFERENCE
-------------------------------------------
Patykowski J, Young L, Treilibs C, Leiper I, Brand L, Hegarty E, Barnett G, Phelan G, Zimny A, Ropiha S, Miller A, and Nano C (2025) Biodiversity Assessment of the Greater Weddell subregion, Northern Territory. Technical Report 8/2025. Final report. Department of Lands, Planning and Environment, Northern Territory Government, Darwin, Australia.

ASSOCIATED REFERENCES
-------------------------------------------
Cuff N, Green C (2016). Threatened species of the Greater Darwin region - Atalaya brevialata. Available at: nt.gov.au/__data/assets/pdf_file/0008/405539/atalaya-brevialata-mapped-distribution.pdf

Liddle D, Harkness P, Westaway J, Lewis D, Cowie I (2013). Vegetation communities and plant biodiversity values of the seasonally saturated lands of the Howard Sand Plains site of conservation significance in the Northern Territory of Australia. Department of Land Resource Management, Palmerston, Australia. Available at: www.greeningaustralia.org.au/wp-content/uploads/2017/11/Howard-Sand-Plains_vegetation-communities.pdf

This record maintained using the NTLIS Metadata Tool

Metadata : Overall Biodiversity Values of the Greater Weddell Subregion, 2025