Management options to minimise formation of urchin barrens: measuring changes in marked incipient barren patches

A photographic and in situ diver survey of marked incipient Centrostephanus rodgersii barren patches, in eastern Tasmanian, was used to assess any changes in the grazed area and shape at experimental (lobster translocation/ research reserve protection sites; and abalone diver urchin cull sites) versus control sites.

Simple

Identification info

Date (Creation)
2011-09-16T15:58:00

Principal investigator

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Johnson, Craig, Prof.
IMAS-Sandy Bay
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

Collaborator

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Ling, Scott, Dr (Research Associate)
IMAS-Sandy Bay
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

researchAssistant

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Sanderson, Craig, Dr (Senior Technical Officer)
IMAS-Sandy Bay
Private Bag 129
Hobart
TAS
7001
Australia
Purpose
Assessment of Management Options to Minimise Formation of 'Barrens' Habitat by the Long-Spined Sea Urchin (Centrostephanus rodgersii) in Tasmania
Credit
Juan Gabriel Dominguez Sarimento
Credit
Emma Flukes
Credit
Funding: FRDC project 2007/045
Status
Completed

Principal investigator

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Johnson, Craig, Prof.
IMAS - Sandy Bay
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

Collaborator

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Ling, Scott, Dr (Marine Experimental and Quantitative Ecologist)
IMAS - Sandy Bay
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

Spatial representation type
Text, table
Temporal resolution
P0Y6M0DT0H0M0S
Topic category
  • Biota

Extent

N
S
E
W


Temporal extent

Time period
2007-11-01T00:00:00 2011-02-28T00:00:00

Vertical element

Minimum value
5
Maximum value
20
Identifier
EPSG::5715
Name
MSL depth
Maintenance and update frequency
Not planned

Resource format

Title
Photo files (jpg)
Date
Edition
-

Resource format

Title
Microsoft Excel (xlsx)
Date
Edition
2007
Global Change Master Directory Earth Science Keywords v.5.3.8
  • Oceans | Marine Biology | Marine Invertebrates
  • Biosphere | Aquatic Habitat | Reef Habitat
  • Oceans | Marine Biology | Marine Habitat
  • Biosphere | Ecological Dynamics | Community Structure
Keywords (Taxon)
  • Centrostephanus rodgersii
  • Heliocidaris erythrogramma
Keywords (Theme)
  • Urchin barren
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
Keywords (Theme)
  • Depth
  • Estimated grazed area
  • Number of C. rodgersii
  • Number of H. erythrogramma

Resource constraints

Classification
Restricted

Resource constraints

Use limitation
The data described in this record are the intellectual property of University of Tasmania through the Institute for Marine and Antarctic Studies

Resource constraints

Linkage
http://i.creativecommons.org/l/by-sa/2.5/au/88x31.png

License Graphic

Title
Creative Commons Attribution-Share Alike 2.5 Australia License


>

Website
http://creativecommons.org/licenses/by-sa/2.5/au/

License Text

Other constraints
The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).
Other constraints
See point of contact for access to the data. Data will be available upon publication.

Associated resource

Title
FRDC project 2007/045
Date (unknown)
2011-09-16T00:00:00
Language
English
Character encoding
UTF8
Supplemental Information
References: Final FRDC Report in draft format. Flukes, E. (2010) Forming barrens habitat on rocky reefs from the inside-out : behavioural dynamics of a diadematid sea urchin. Unpublished Honours thesis, University of Tasmania

Content Information

Content type
Physical measurement
Name
Depth

Name
metres
Name
Estimated grazed area

Name
m2
Name
Number of C. rodgersii

Name
Small (<70mm) or Large (>70mm)
Name
Number of H. erythrogramma

Name
Small (<70mm) or Large (>70mm)

Distribution Information

Distribution format
  • Photo files (jpg)

  • Microsoft Excel (xlsx)

Resource lineage

Statement
Photographs of marked incipient Centrostephanus rodgersii barren patches were used to assess any changes in the grazed area and shape. For this reason it was important that all the photos were comparable in space and the incipient patch is complete, photographed in focus and taken in good water visibility. Before taking the photo, a metallic quadrat of 1m x 1m was placed in the middle of the patch, in a standard location for each time period. The photo was taken vertically on top of the incipient barren with the long axis of the photo parallel to the coast line. It was important to capture the total area of the patch and the habitat surrounds. Ideally the photo would be taken from the surface but this was dependent on visibility (minimum height 3m from reef surface). Sometimes several photos were necessary to cover the total extent of the patch. If a wide-angle lens was used, correction was applied so the image was planar, using PTLens distortion correction software. Photos were analysed using ImageJ software. Parameters measured include - patch depth. - estimated grazed area (m^2): total grazed area in square metres (using 1 x 1 m quadrat as a guide) estimated by the diver in situ following the contours of the bottom. - estimated planar area (m^2): grazed area visible for the diver from 3 metres vertically above the bottom in a 2 dimensional plane (using 1 x 1 m quadrat as a guide). - patch sketch: a simple sketch of the shape of the patch marking the quadrat position on it. - Number of C. rodgersii: divided in large and small (small <70 mm test diameter, large >70 mm test diameter). These numbers are subdivided into cryptic (in crevices with less than 90ยบ aperture) and exposed classes. - Number of H. erythrogramma: as above.
Hierarchy level
Dataset

Resource lineage

Statement
GPS used datum WGS84.
Hierarchy level
Collection hardware

Metadata

Metadata identifier
747dfb77-b7ee-4b61-86a9-f7e8b58cdbb3

Language
English
Character encoding
UTF8

Point of contact

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - IMAS Data Manager

Type of resource

Resource scope
Dataset
Metadata linkage
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/747dfb77-b7ee-4b61-86a9-f7e8b58cdbb3

Point of truth URL of this metadata record

Date info (Creation)
2020-09-17T18:01:19
Date info (Revision)
2020-09-17T18:01:19

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

Spatial extent

N
S
E
W


Keywords

Depth Estimated grazed area Number of C. rodgersii Number of H. erythrogramma Urchin barren
Global Change Master Directory Earth Science Keywords v.5.3.8
Biosphere | Aquatic Habitat | Reef Habitat Biosphere | Ecological Dynamics | Community Structure Oceans | Marine Biology | Marine Habitat Oceans | Marine Biology | Marine Invertebrates

Provided by

Share on social sites

Access to the record in catalogue

Associated resources

Not available