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Management options to minimise formation of urchin barrens: assessing dynamics of incipient urchin barrens patches in eastern Tasmania using timed swims

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/8720b9de-26b7-46c7-998b-77f169799a10&rft.title=Management options to minimise formation of urchin barrens: assessing dynamics of incipient urchin barrens patches in eastern Tasmania using timed swims&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/8720b9de-26b7-46c7-998b-77f169799a10&rft.description=Timed GPS-tracked swims using SCUBA (45 and 30 minutes), were used to assess the changes in frequency and size of Centrostephanus rodgerii incipient barrens in eastern Tasmania. The number of C. rodgerii and Heliocidaris erythrogramma in each incipient barren were also assessed.Maintenance and Update Frequency: notPlannedStatement: Two swims are used to assess each site. The diver had a foam float on the surface housing a GPS device (track log turned on, WGS84) to track the swim positions. The swim direction was parallel to the coastline (along shore) with the diver maintaining a steady depth between 10 and 15 metres. Swims were 30 minutes in duration for Abalone Activity sites and 45 minutes in duration for translocated lobster experiment sites, with the diver maintaining a constant speed during this time. Time at which barrens were observed were recorded by the diver in situ with positional estimates (lat, lon) obtained for the barrens by synchronising diver time (watch/ dive computer) with that of the GPS. For each incipient barren found, the diver recorded the approximately grazed area in square metres and the number of C. rodgerii and H. erythrogramma present in the barren. In the case that the barren was too large to be assessed instantaneously (i.e. ~more than 10m), the diver recorded the time upon entering the patch and the time when exiting the patch and an approximate width of the barren (this data was used in the lab to estimate the size of the barren from GPS coordinates), in this case the diver didn't count sea urchin individuals but approximated the overall number of C. rodgerii within the grazed area to the nearest 10, 50 or 100 urchins depending on the size of the patch/ population, i.e. if population was approximately 100 units to the nearest 10 individual urchins was used, if population 500 units of the nearest 50 was used, i.e. estimates were approximated to within the nearest 10% of overall population size.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=15; downlimit=10&rft.coverage=uplimit=15; downlimit=10&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=Substratum type&rft_subject=Number of incipient barren patches&rft_subject=Incipient barren area&rft_subject=Depth&rft_subject=Number of C. rodgersii&rft_subject=Number of H. erythrogramma&rft.type=dataset&rft.language=English Access the data
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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

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Brief description

Timed GPS-tracked swims using SCUBA (45 and 30 minutes), were used to assess the changes in frequency and size of Centrostephanus rodgerii incipient barrens in eastern Tasmania. The number of C. rodgerii and Heliocidaris erythrogramma in each incipient barren were also assessed.

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Maintenance and Update Frequency: notPlanned
Statement: Two swims are used to assess each site. The diver had a foam float on the surface housing a GPS device (track log turned on, WGS84) to track the swim positions. The swim direction was parallel to the coastline (along shore) with the diver maintaining a steady depth between 10 and 15 metres. Swims were 30 minutes in duration for "Abalone Activity" sites and 45 minutes in duration for translocated lobster experiment sites, with the diver maintaining a constant speed during this time. Time at which barrens were observed were recorded by the diver in situ with positional estimates (lat, lon) obtained for the barrens by synchronising diver time (watch/ dive computer) with that of the GPS. For each incipient barren found, the diver recorded the approximately grazed area in square metres and the number of C. rodgerii and H. erythrogramma present in the barren. In the case that the barren was too large to be assessed instantaneously (i.e. ~more than 10m), the diver recorded the time upon entering the patch and the time when exiting the patch and an approximate width of the barren (this data was used in the lab to estimate the size of the barren from GPS coordinates), in this case the diver didn't count sea urchin individuals but approximated the overall number of C. rodgerii within the grazed area to the nearest 10, 50 or 100 urchins depending on the size of the patch/ population, i.e. if population was approximately 100 units to the nearest "10" individual urchins was used, if population 500 units of the nearest "50" was used, i.e. estimates were approximated to within the nearest 10% of overall population size.
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

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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=15; downlimit=10

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

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  • global : 8720b9de-26b7-46c7-998b-77f169799a10
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