Data

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

Australian Ocean Data Network
Johnson, Craig, Prof. ; Ling, Scott, Dr ; Sanderson, Craig, Dr
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/747dfb77-b7ee-4b61-86a9-f7e8b58cdbb3&rft.title=Management options to minimise formation of urchin barrens: measuring changes in marked incipient barren patches&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/747dfb77-b7ee-4b61-86a9-f7e8b58cdbb3&rft.description=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.Maintenance and Update Frequency: notPlannedStatement: 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). These numbers are subdivided into cryptic (in crevices with less than 90º aperture) and exposed classes. - Number of H. erythrogramma: as above.Statement: GPS used datum WGS84.&rft.creator=Johnson, Craig, Prof. &rft.creator=Ling, Scott, Dr &rft.creator=Sanderson, Craig, Dr &rft.date=2011&rft.coverage=westlimit=147.3; southlimit=-43.5; eastlimit=148.5; northlimit=-41&rft.coverage=westlimit=147.3; southlimit=-43.5; eastlimit=148.5; northlimit=-41&rft.coverage=uplimit=20; downlimit=5&rft.coverage=uplimit=20; downlimit=5&rft_rights=Creative Commons Attribution-Share Alike 2.5 Australia License http://creativecommons.org/licenses/by-sa/2.5/au/&rft_rights=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).&rft_rights=See point of contact for access to the data. Data will be available upon publication.&rft_rights=The data described in this record are the intellectual property of University of Tasmania through the Institute for Marine and Antarctic Studies&rft_subject=biota&rft_subject=Oceans | Marine Biology | Marine Invertebrates&rft_subject=REEF HABITAT&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=AQUATIC ECOSYSTEMS&rft_subject=MARINE HABITAT&rft_subject=COMMUNITY STRUCTURE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=Centrostephanus rodgersii&rft_subject=Heliocidaris erythrogramma&rft_subject=Urchin barren&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Depth&rft_subject=Estimated grazed area&rft_subject=Number of C. rodgersii&rft_subject=Number of H. erythrogramma&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

Other view details
Unknown

Creative Commons Attribution-Share Alike 2.5 Australia License
http://creativecommons.org/licenses/by-sa/2.5/au/

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).

See point of contact for access to the data. Data will be available upon publication.

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

Access:

Other

Brief description

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.

Lineage

Maintenance and Update Frequency: notPlanned
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 90º aperture) and exposed classes. - Number of H. erythrogramma: as above.
Statement: GPS used datum WGS84.

Notes

Credit
Juan Gabriel Dominguez Sarimento
Credit
Emma Flukes
Credit
Funding: FRDC project 2007/045
Purpose
Assessment of Management Options to Minimise Formation of 'Barrens' Habitat by the Long-Spined Sea Urchin (Centrostephanus rodgersii) in Tasmania

Created: 16 09 2011

Data time period: 11 2007 to 28 02 2011

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related Organisations

Related People

148.5,-41 148.5,-43.5 147.3,-43.5 147.3,-41 148.5,-41

147.9,-42.25

text: westlimit=147.3; southlimit=-43.5; eastlimit=148.5; northlimit=-41

text: uplimit=20; downlimit=5

Subjects
AQUATIC ECOSYSTEMS | Biological Sciences | BIOSPHERE | COMMUNITY DYNAMICS | Community Structure | Centrostephanus rodgersii | Depth | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Ecology | Estimated grazed area | Heliocidaris erythrogramma | Marine Habitat | Marine and Estuarine Ecology (Incl. Marine Ichthyology) | Number of C. rodgersii | Number of H. erythrogramma | Oceans | Marine Biology | Marine Invertebrates | Reef Habitat | Urchin barren | biota |

User Contributed Tags    

Login to tag this record with meaningful keywords to make it easier to discover

Other Information
Identifiers
  • global : 747dfb77-b7ee-4b61-86a9-f7e8b58cdbb3
Similar data you may be interested in: