Data

Impacts of New Zealand screwshells (Maoricolpus roseus) on growth and condition of juvenile commercial scallops (Pecten fumatus)

University of Tasmania, Australia
Reid, Anthony ; Johnson, Craig, Prof. ; Ross, Jeff, 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/f73b42f4-ebef-436b-bb1e-91aecab19256&rft.title=Impacts of New Zealand screwshells (Maoricolpus roseus) on growth and condition of juvenile commercial scallops (Pecten fumatus)&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/f73b42f4-ebef-436b-bb1e-91aecab19256&rft.description=The impact of the introduction of the New Zealand screwshell (Maoricolpus roseus) on growth, condition and survivorship of juvenile scallops (Pecten fumatus) at Bligh Point in the D'Entrecasteaux Channel, SE Tasmania was investigated. A manipulative experiment was used to quantity the impact associated with live and dead M. roseus shells and to quantify differences in interspecific and intraspecific competition.Maintenance and Update Frequency: notPlannedStatement: The experiment was conducted in situ at Bligh Point on Bruny Island, at 12m depth. Juvenile scallops (collected on the 18th May 2005)were individually tagged, and had initial measurements of shell length and width taken. A digital photograph was also taken of the flat right valve of each scallop prior to deployment. Maoricolpus roseus were collected at Dennes Point on 12 May 2005. Live M. roseus were separated from dead and empty shell, and shells containing hermit crabs. Additional dead and empty M. roseus were obtained from Blackmans Bay beach. Experimental design The experiment was carried out in circular cages consisting of a rigid 60mm high PVC ring (1m2) attached to a ring of oyster mesh (600mm high and mesh size of 20x20 mm). Cages has no roofs or floors, and a small curtain of soft mesh supported by buoys attached to the top of the cages prevented sea stars from entering. Cages were pushed into the sediment to a depth of 80mm and pinned into place to prevent the escape of scallops and the incursion of predators under the cages. Cages were cleared of any fouling every two weeks. Screwshells were added to the experimental cage one week before the introduction of the scallops on the 21 May 2005, with the experiment running for 85 days. Screwshells were allocated randomly to two treatments: cages with live screwshells added at 1000/m2 and cages with dead and empty screwshells added at 1000/m2. A control cage, which did not contain any screwshells, was also deployed. Each treatment was applied to 6 individual cages, and each of the six cages in each treatment was then randomely allocated either 5, 10, 15, 20, 25 or 30 P. fumatus juveniles. On completion of the experiment, all surviving scallops were measured for the following parameters: shell width, shell height, right valve growth, dry weight of shell and soft tissue, and ash-free dry weight of soft tissue. Right valve growth was calculated as the distance between a clearly visable stress ring, laid down at the time of relocation of the scallops, and the edge of the shell. Dry weights were calculated by removing soft-tissue from the shell and drying each component to a constant weight which was achieved at 60oC for 48hrs. Ash-free dry weight of soft-tissue was determined after burning off organic matter for 7hrs at 500oC in a blast furnace. A measure of condition was calculated by dividing the ash-free dry weight of soft tissue by the dry weight of the shell fo reach individual scallop. Mortality was assessed weekly.&rft.creator=Reid, Anthony &rft.creator=Johnson, Craig, Prof. &rft.creator=Ross, Jeff, Dr &rft.date=2011&rft.coverage=westlimit=147.3; southlimit=-43.1; eastlimit=147.4; northlimit=-43.0&rft.coverage=westlimit=147.3; southlimit=-43.1; eastlimit=147.4; northlimit=-43.0&rft.coverage=uplimit=12; downlimit=&rft.coverage=uplimit=12; downlimit=&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/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=This data is yet to be published, please contact the researcher for access to the data.&rft_rights=The data described in this record are the intellectual property of A. Reid.&rft_subject=biota&rft_subject=BENTHIC HABITAT&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=AQUATIC ECOSYSTEMS&rft_subject=COMMUNITY STRUCTURE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=Biosphere | Ecological Dynamics | Competition&rft_subject=Oceans | Marine Biology | Marine Invertebrates&rft_subject=MOLLUSKS&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/INVERTEBRATES&rft_subject=24 079001&rft_subject=Maoricolpus roseus&rft_subject=23 270007&rft_subject=Pecten fumatus&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Invasive Species Ecology&rft_subject=ENVIRONMENTAL SCIENCES&rft_subject=ECOLOGICAL APPLICATIONS&rft_subject=Scallop shell length&rft_subject=Scallop shell width&rft_subject=Scallop right valve growth&rft_subject=Dry weight of scallop shell&rft_subject=Dry weight of scallop soft tissue&rft_subject=Ash-free dry weight of scallop soft tissue&rft_subject=Scallop condition&rft_subject=Scallop survival&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).

This data is yet to be published, please contact the researcher for access to the data.

The data described in this record are the intellectual property of A. Reid.

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The impact of the introduction of the New Zealand screwshell (Maoricolpus roseus) on growth, condition and survivorship of juvenile scallops (Pecten fumatus) at Bligh Point in the D'Entrecasteaux Channel, SE Tasmania was investigated. A manipulative experiment was used to quantity the impact associated with live and dead M. roseus shells and to quantify differences in interspecific and intraspecific competition.

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Maintenance and Update Frequency: notPlanned
Statement: The experiment was conducted in situ at Bligh Point on Bruny Island, at 12m depth. Juvenile scallops (collected on the 18th May 2005)were individually tagged, and had initial measurements of shell length and width taken. A digital photograph was also taken of the flat right valve of each scallop prior to deployment. Maoricolpus roseus were collected at Dennes Point on 12 May 2005. Live M. roseus were separated from dead and empty shell, and shells containing hermit crabs. Additional dead and empty M. roseus were obtained from Blackmans Bay beach. Experimental design The experiment was carried out in circular cages consisting of a rigid 60mm high PVC ring (1m2) attached to a ring of oyster mesh (600mm high and mesh size of 20x20 mm). Cages has no roofs or floors, and a small curtain of soft mesh supported by buoys attached to the top of the cages prevented sea stars from entering. Cages were pushed into the sediment to a depth of 80mm and pinned into place to prevent the escape of scallops and the incursion of predators under the cages. Cages were cleared of any fouling every two weeks. Screwshells were added to the experimental cage one week before the introduction of the scallops on the 21 May 2005, with the experiment running for 85 days. Screwshells were allocated randomly to two treatments: cages with live screwshells added at 1000/m2 and cages with dead and empty screwshells added at 1000/m2. A control cage, which did not contain any screwshells, was also deployed. Each treatment was applied to 6 individual cages, and each of the six cages in each treatment was then randomely allocated either 5, 10, 15, 20, 25 or 30 P. fumatus juveniles. On completion of the experiment, all surviving scallops were measured for the following parameters: shell width, shell height, right valve growth, dry weight of shell and soft tissue, and ash-free dry weight of soft tissue. Right valve growth was calculated as the distance between a clearly visable stress ring, laid down at the time of relocation of the scallops, and the edge of the shell. Dry weights were calculated by removing soft-tissue from the shell and drying each component to a constant weight which was achieved at 60oC for 48hrs. Ash-free dry weight of soft-tissue was determined after burning off organic matter for 7hrs at 500oC in a blast furnace. A measure of condition was calculated by dividing the ash-free dry weight of soft tissue by the dry weight of the shell fo reach individual scallop. Mortality was assessed weekly.

Notes

Credit
School of Zoology, University of Tasmania
Credit
Natural Heritage Trust (NHT) Grant from DEH
Purpose
To investigate the impact of the introduced New Zealand screwshell (Maoricolpus roseus) on a commercial scallop species.

Created: 19 10 2011

Data time period: 12 05 2005 to 13 08 2005

This dataset is part of a larger collection

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147.4,-43 147.4,-43.1 147.3,-43.1 147.3,-43 147.4,-43

147.35,-43.05

text: westlimit=147.3; southlimit=-43.1; eastlimit=147.4; northlimit=-43.0

text: uplimit=12; downlimit=

Subjects
23 270007 | 24 079001 | ANIMALS/INVERTEBRATES | AQUATIC ECOSYSTEMS | Ash-free dry weight of scallop soft tissue | Benthic Habitat | BIOLOGICAL CLASSIFICATION | Biological Sciences | BIOSPHERE | Biosphere | Ecological Dynamics | Competition | COMMUNITY DYNAMICS | Community Structure | Dry weight of scallop shell | Dry weight of scallop soft tissue | EARTH SCIENCE | Ecological Applications | ECOLOGICAL DYNAMICS | Ecology | Environmental Sciences | Invasive Species Ecology | Mollusks | Maoricolpus roseus | Marine and Estuarine Ecology (Incl. Marine Ichthyology) | Oceans | Marine Biology | Marine Invertebrates | Pecten fumatus | Scallop condition | Scallop right valve growth | Scallop shell length | Scallop shell width | Scallop survival | biota |

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  • global : f73b42f4-ebef-436b-bb1e-91aecab19256