Data

Management options to minimise formation of urchin barrens: kelp lines - assessment of changes in kelp growth at the kelp-barren interface

University of Tasmania, Australia
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/205ba802-5277-4724-951a-338d40e575f4&rft.title=Management options to minimise formation of urchin barrens: kelp lines - assessment of changes in kelp growth at the kelp-barren interface&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/205ba802-5277-4724-951a-338d40e575f4&rft.description=Linear video transects (40m total length; 20m into barrens and 20m into kelp from original fixed marker on the benthos) were used to assess changes in kelp growth in several points along the kelp - urchin barren interface in north-east Tasmania (St. Helens Island, Sloop Rock and Elephant Rock research areas). The video transects were deployed in the same position, and assessed at different points of time. The video was analysed in the laboratory to assess percentage of kelp and barren cover, as well as the kind of substratum, kelp species identifiable and number of sea urchins (Centrostephanus rodgerii and Heliocidaris erythrogramma) and other benthic organisms when present (rock lobster and abalone).Maintenance and Update Frequency: notPlannedStatement: Fixed position video transects (40m long) were deployed perpendicular to the Kelp-Barren interface (in most cases this would be perpendicular to the coast line). The transect was deployed 20 metres into the barren zone, always following the same bearing on the diver's compass. After the transect has been video recorded, the process was repeated 20 metres into the Kelp zone. The video was recorded along the transect line maintaining a constant speed (3 m/s) and a constant distance between the lens and the substrate. Photos derived from the videos were analysed using ImageJ software. The position of the kelp-barrens interface was also determined from still images derived from the video footage to determine any positional shifts in this interface relative to the orginal fixed marker(s). Photos across the entire transect (into barrens and into the kelp bed) were analysed (per m2) to assess the percentage cover of Barren and Kelp, with the percentage adjusted to the nearest multiple of 25 (25%, 50%, 75% or 100%). In addition the number of C. rodgersii (H. erythrogramma, Rock lobsters and abalone were counted, if they were visible) were counted.Statement: GPS used datum WGS84. The video transects were recorded using a SONY Handycam, model DCRTRV900E or a NIKON D300S Digital Camera.&rft.creator=Johnson, Craig, Prof. &rft.creator=Ling, Scott, Dr &rft.creator=Sanderson, Craig, Dr &rft.date=2011&rft.coverage=westlimit=148.25; southlimit=-41.35; eastlimit=148.35; northlimit=-41.2&rft.coverage=westlimit=148.25; southlimit=-41.35; eastlimit=148.35; northlimit=-41.2&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=Biosphere | Vegetation | Macroalgae&rft_subject=Centrostephanus rodgersii&rft_subject=Jasus edwardsii&rft_subject=Haliotis rubra&rft_subject=Ecklonia radiata&rft_subject=Phyllospora comosa&rft_subject=Macrocystis pyrifera&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=Substratum type&rft_subject=Urchin barren coverage&rft_subject=Kelp coverage&rft_subject=Urchin abundance&rft_subject=Rock lobster abundance&rft_subject=Abalone abundance&rft.type=dataset&rft.language=English Access the data
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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).

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

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Linear video transects (40m total length; 20m into barrens and 20m into kelp from original fixed marker on the benthos) were used to assess changes in kelp growth in several points along the kelp - urchin barren interface in north-east Tasmania (St. Helens Island, Sloop Rock and Elephant Rock research areas). The video transects were deployed in the same position, and assessed at different points of time. The video was analysed in the laboratory to assess percentage of kelp and barren cover, as well as the kind of substratum, kelp species identifiable and number of sea urchins (Centrostephanus rodgerii and Heliocidaris erythrogramma) and other benthic organisms when present (rock lobster and abalone).

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Maintenance and Update Frequency: notPlanned
Statement: Fixed position video transects (40m long) were deployed perpendicular to the Kelp-Barren interface (in most cases this would be perpendicular to the coast line). The transect was deployed 20 metres into the barren zone, always following the same bearing on the diver's compass. After the transect has been video recorded, the process was repeated 20 metres into the Kelp zone. The video was recorded along the transect line maintaining a constant speed (3 m/s) and a constant distance between the lens and the substrate. Photos derived from the videos were analysed using ImageJ software. The position of the kelp-barrens interface was also determined from still images derived from the video footage to determine any positional shifts in this interface relative to the orginal fixed marker(s). Photos across the entire transect (into barrens and into the kelp bed) were analysed (per m2) to assess the percentage cover of Barren and Kelp, with the percentage adjusted to the nearest multiple of 25 (25%, 50%, 75% or 100%). In addition the number of C. rodgersii (H. erythrogramma, Rock lobsters and abalone were counted, if they were visible) were counted.
Statement: GPS used datum WGS84. The video transects were recorded using a SONY Handycam, model DCRTRV900E or a NIKON D300S Digital Camera.

Notes

Credit
Juan Gabriel Dominguez Sarimento
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

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148.35,-41.2 148.35,-41.35 148.25,-41.35 148.25,-41.2 148.35,-41.2

148.3,-41.275

text: westlimit=148.25; southlimit=-41.35; eastlimit=148.35; northlimit=-41.2

text: uplimit=20; downlimit=5

Subjects
AQUATIC ECOSYSTEMS | Abalone abundance | Biological Sciences | BIOSPHERE | Biosphere | Vegetation | Macroalgae | COMMUNITY DYNAMICS | Community Structure | Centrostephanus rodgersii | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Ecology | Ecklonia radiata | Haliotis rubra | Heliocidaris erythrogramma | Jasus edwardsii | Kelp coverage | Marine Habitat | Macrocystis pyrifera | Marine and Estuarine Ecology (Incl. Marine Ichthyology) | Oceans | Marine Biology | Marine Invertebrates | Phyllospora comosa | Reef Habitat | Rock lobster abundance | Substratum type | Urchin abundance | Urchin barren | Urchin barren coverage | biota |

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  • global : 205ba802-5277-4724-951a-338d40e575f4
ACN 633 798 857