IMAS Metadata Catalogue
Leschenault Estuary (WA) Seagrass 2009
Aquatic flora surveys were conducted in the Leschenault Estuary in April 2009. This data is part of the 2013 report "Synthesis of seagrass mapping studies" conducted by the Water Science Branch of the Department of Water.
Surveys were initially conducted by the WA Department of Water together with Geoscience Australia. The objective of these surveys was to collect baseline data on seagrass composition and distribution in key estuaries of southern and south-western WA.
This data was acquired by the ACEAS Seagrass Group as part of the 2013 Australia-wide risk assessment of Seagrass.
Surveys were conducted again 2015-2023 (February 2015, February and March 2016, February 2017, February and March 2018, February 2019, February and March 2020, February 2021, February and March 2022, and February and March 2023) by the Department of Water and Environmental Regulation as "Leschenault Estuary Seagrass Survey".
The datasets making up the 2009 Leschenault Estuary seagrass survey data are:
WA_Leschenault_SAV_sites - point dataset of species presence/absence and survey methodology at each site.
WA_Leschenault_SAV_polygons - polygon dataset showing interpolated percentage cover in polygons derived from site points.
This record provides access to the initial WA DoW surveys. See associated DWER records in Data WA catalogue for access to newer surveys at this site.
Simple
Identification info
- Date (Revision)
- 2023-09-16
- Date (Publication)
- 2017-10-02
- Credit
- Department of Water, Government of Western Australia.
- Status
- Completed
- Spatial representation type
- Vector
- Topic category
-
- Biota
Extent
))
Temporal extent
- Time position
- 2009-01-01T00:00:00
- Time position
- 2009-12-31T00:00:00
- Maintenance and update frequency
- Not planned
Resource format
- Title
- ESRI Shapefile
- Date
- Edition
- -
- GCMD Keywords, Version 8.5
- Region
-
- WESTERN AUSTRALIA
- Keywords (Theme)
-
- Benthic habitat
- AODN Instrument Vocabulary
Resource specific usage
- Specific usage
- Data supplied for use by the Seamap Australia Project.
Resource constraints
- Classification
- Unclassified
Resource constraints
- Linkage
-
http://i.creativecommons.org/l/by/4.0/88x31.png
License Graphic
- Title
- Creative Commons Attribution 4.0 International License
- Website
-
http://creativecommons.org/licenses/by/4.0/
License Text
- Other constraints
- Cite data as: Leschenault Estuary (WA) Seagrass 2009. Department of Water, Government of Western Australia (2013). Data accessed at http://metadata.imas.utas.edu.au/geonetwork/srv/en/metadata.show?uuid=1312EDED-E3C1-47D3-9971-FA35FA45A98D on (access date).
- Other constraints
- This dataset is hosted by the Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, on behalf of the Western Australian Government for the purposes of the Seamap Australia collaborative project.
- Language
- English
- Character encoding
- UTF8
Content Information
- Content type
- Physical measurement
- Description
- Percentage cover of seagrass
Identifier
- Code
- Abundance of biota
- Identifier
- http://vocab.nerc.ac.uk/collection/P06/current/UPCT
- Name
- Percent
- Description
- Appended to original data for styling purposes for the Seamap Australia Project.
- Name
-
Benthic habitat
- Name
-
SM_HAB_CLS
Distribution Information
- Distribution format
-
-
ESRI Shapefile
-
ESRI Shapefile
Distributor
Distributor
- OnLine resource
-
Leschenault Estuary seagrass sites 2009 [.shp download]
- OnLine resource
-
Leschenault Estuary seagrass polygons 2009 [.shp download]
- OnLine resource
-
2013 Synthesis of seagrass mapping studies [report]
- OnLine resource
-
Associated surveys - seagrass survey - cover [Data WA catalogue]
Resource lineage
- Statement
- Method as taken from the 2013 report "Synthesis of seagrass mapping studies" conducted by the Water Science Branch of the Department of Water": (The following methodology was adapted from the Wilson Inlet survey in 2008 conducted by Geoscience Australia with the Department of Water). Maps of submerged aquatic vegetation (predominantly seagrass) were prepared from geo-referenced underwater video data captured in April 2009. Site selection involved the preparation of a 250m by 250m grid referenced aerial image of the estuary. ‘Fixed’ sites were determined by the intersection of the easting and northing lines on the map and were evenly spaced across the extent of the estuary to optimise the area covered across the estuary. Associated with each of the fixed sites were four ‘random’ sites located North, East, South and West of each ‘fixed’ site. The distance between fixed and random sites depended on distance between fixed sites with the objective to maximise coverage between sites. The underwater video was deployed at each of the fixed and random sites. At the fixed sites, the camera was deployed while the boat was anchored to capture precise point data that corresponded to other sediment and water quality data collected. Camera deployment at each of random sites captured data along transects, with the boat traveling into or with the prevailing winds to minimize movement of the boat and camera. Transects were between 2 and 4 minutes long and covered 50 to 100m at each of the random sites. Species composition and density (as percentage cover) were assessed in the field from the visual image obtained on the video. All transects are recorded for verification. Seagrass density changes in the estuaries were mapped by the Department of Water using ArcView. Spatial Analyst was used to create the distribution map of seagrass in the Inlet by interpolating density data between the points using the inverse distance weighted method. In the absence of bathymetry data the depth limit of seagrass distribution could not be shown. In these instances seagrass distribution may be overestimated in the deeper sections of the estuary.
- Hierarchy level
- Dataset
- Hierarchy level
- Dataset
Platform
Identifier
- Code
- research vessel
Instrument
Identifier
- Code
- underwater cameras
Metadata
- Metadata identifier
-
urn:uuid/1312EDED-E3C1-47D3-9971-FA35FA45A98D
- Language
- English
- Character encoding
- UTF8
Point of contact
- Parent metadata
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/1312EDED-E3C1-47D3-9971-FA35FA45A98D
Point of truth URL of this metadata record
- Date info (Creation)
- 2020-09-23T12:44:55
- Date info (Revision)
- 2025-04-30T12:20:48
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
Provided by
