Data

Impacts of New Zealand screwshells (Maoricolpus roseus) on native scallop distribution and behaviour

Australian Ocean Data Network
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/1d6af690-93f6-11dd-a3ad-00188b4c0af8&rft.title=Impacts of New Zealand screwshells (Maoricolpus roseus) on native scallop distribution and behaviour&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/1d6af690-93f6-11dd-a3ad-00188b4c0af8&rft.description=The impact of the introduction of the New Zealand screwshell (Maoricolpus roseus) on scallop distribution and behaviour in the D'Entrecasteaux Channel, SE Tasmania was investigated. The impact of both live and dead and empty M. roseus shells on the distribution of two sympatric scallop species, queen scallop (Equichlamys bifrons) and doughboy scallop (Chlamys asperrimus) was quantified at large spatial scales. Also quantified was the impact of M. roseus on the distribution and behaviour of the commercial scallop (Pecten fumatus), at both large and small spatial scales.Maintenance and Update Frequency: notPlannedStatement: A total of 20 sampling locations were selected, spanning the length of the D'Entrecasteaux Channel. At each location, scallops and screwshells were counted within 1m either side of a 50m transect line. The transect was divided into 2m lengths, enabling density estimates of screwshells and scallops to a spatial resolution of 2x1m sections. A SCUBA diver samples each 2x1m section on either side of the transect line. Within each 2x1m section, screwshells were counted and scallops identified to species, counted and the shell width (the same standard measure used by the commercial and recreational fisheries) measured. The sediment type in each 2x1m section was also scored qualitatively from coarse sand through to fine silt (on a scale of 0-5) on the basis of sediment size and the quantity of shell grit. Small scale distribution of Pecten fumatus Surveys were conducted at 3 sites, using an elongated quadrat consisting of ten 100x100mm steel squares welded together in line to form a 1m long strip of 100 mm2 mesh. On locating a commercial scallop , one end of the quadrat was placed adjacent to the scallop, pointing in a direction derived from random compass bearing. A second quadrat was then placed perpendicular to the first, a third perpendicular to the second, and a fourth perpendicular to the third. The number of screwshells in each 100mm2 section was then counted and recorded to estimate density of screwshells at different distances from the scallop. The number of screwshells in the 100m2 directly beneath the scallop was also counted. The shell width of the scallop was also measured. In Situ manipulative experiment - habitat selection Cages consisting of a rigid 60mm high polyvinylcarbonate (PVC) ring (1m2) attached to a ring of oyster mesh (600mm high, mesh size of 20x20mm). Cages had no roofs or floors. Attached to the top of the cages was a small curtain of soft mesh supported by buoys to prevent sea stars (potential predators) entering the cages. Cages were pushed into the sediment to a depth of 80mm and held in place by metal star pickets. Dead and empty screwshells added at a density of 1200/m2 to one half of the cage and the second half of the cage was left bare. Screwshells were added 1 week before the scallops. Adult P. fumatus (80-100mm) were then allocated randomly to either the bare substratum, or the 'screwshell half' of each cage, initially using only a single scallop per cage. A second and third trial was then conducted using higher scallop densities of 2 scallops and 4 scallops per cage respectively, again allocating all scallops to one half of the cage (either bare substratum or the screwshell bed) at random. A total of 16 replicate cages were deployed in each trial.&rft.creator=Reid, Anthony &rft.creator=Johnson, Craig, Prof. &rft.creator=Ross, Jeff, Dr &rft.date=2008&rft.coverage=westlimit=147.20; southlimit=-43.30; eastlimit=147.40; northlimit=-43.05&rft.coverage=westlimit=147.20; southlimit=-43.30; eastlimit=147.40; northlimit=-43.05&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 270005&rft_subject=Equichlamys bifrons&rft_subject=23 270006&rft_subject=Chlamys asperrimus&rft_subject=23 270007&rft_subject=Pecten fumatus&rft_subject=Invasive Species Ecology&rft_subject=ENVIRONMENTAL SCIENCES&rft_subject=ECOLOGICAL APPLICATIONS&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Number of scallops&rft_subject=Scallop density&rft_subject=Screwshell density&rft_subject=Scallop size&rft_subject=Substratum type preference&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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Brief description

The impact of the introduction of the New Zealand screwshell (Maoricolpus roseus) on scallop distribution and behaviour in the D'Entrecasteaux Channel, SE Tasmania was investigated. The impact of both live and dead and empty M. roseus shells on the distribution of two sympatric scallop species, queen scallop (Equichlamys bifrons) and doughboy scallop (Chlamys asperrimus) was quantified at large spatial scales. Also quantified was the impact of M. roseus on the distribution and behaviour of the commercial scallop (Pecten fumatus), at both large and small spatial scales.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: A total of 20 sampling locations were selected, spanning the length of the D'Entrecasteaux Channel. At each location, scallops and screwshells were counted within 1m either side of a 50m transect line. The transect was divided into 2m lengths, enabling density estimates of screwshells and scallops to a spatial resolution of 2x1m sections. A SCUBA diver samples each 2x1m section on either side of the transect line. Within each 2x1m section, screwshells were counted and scallops identified to species, counted and the shell width (the same standard measure used by the commercial and recreational fisheries) measured. The sediment type in each 2x1m section was also scored qualitatively from coarse sand through to fine silt (on a scale of 0-5) on the basis of sediment size and the quantity of shell grit. Small scale distribution of Pecten fumatus Surveys were conducted at 3 sites, using an elongated quadrat consisting of ten 100x100mm steel squares welded together in line to form a 1m long strip of 100 mm2 mesh. On locating a commercial scallop , one end of the quadrat was placed adjacent to the scallop, pointing in a direction derived from random compass bearing. A second quadrat was then placed perpendicular to the first, a third perpendicular to the second, and a fourth perpendicular to the third. The number of screwshells in each 100mm2 section was then counted and recorded to estimate density of screwshells at different distances from the scallop. The number of screwshells in the 100m2 directly beneath the scallop was also counted. The shell width of the scallop was also measured. In Situ manipulative experiment - habitat selection Cages consisting of a rigid 60mm high polyvinylcarbonate (PVC) ring (1m2) attached to a ring of oyster mesh (600mm high, mesh size of 20x20mm). Cages had no roofs or floors. Attached to the top of the cages was a small curtain of soft mesh supported by buoys to prevent sea stars (potential predators) entering the cages. Cages were pushed into the sediment to a depth of 80mm and held in place by metal star pickets. Dead and empty screwshells added at a density of 1200/m2 to one half of the cage and the second half of the cage was left bare. Screwshells were added 1 week before the scallops. Adult P. fumatus (80-100mm) were then allocated randomly to either the bare substratum, or the 'screwshell half' of each cage, initially using only a single scallop per cage. A second and third trial was then conducted using higher scallop densities of 2 scallops and 4 scallops per cage respectively, again allocating all scallops to one half of the cage (either bare substratum or the screwshell bed) at random. A total of 16 replicate cages were deployed in each trial.

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 scallop distribution and behaviour.

Created: 05 09 2008

Data time period: 10 03 2006 to 30 06 2007

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147.4,-43.05 147.4,-43.3 147.2,-43.3 147.2,-43.05 147.4,-43.05

147.3,-43.175

text: westlimit=147.20; southlimit=-43.30; eastlimit=147.40; northlimit=-43.05

text: uplimit=12; downlimit=

Subjects
23 270005 | 23 270006 | 23 270007 | 24 079001 | ANIMALS/INVERTEBRATES | AQUATIC ECOSYSTEMS | Benthic Habitat | BIOLOGICAL CLASSIFICATION | Biological Sciences | BIOSPHERE | Biosphere | Ecological Dynamics | Competition | COMMUNITY DYNAMICS | Community Structure | Chlamys asperrimus | EARTH SCIENCE | Ecological Applications | ECOLOGICAL DYNAMICS | Ecology | Environmental Sciences | Equichlamys bifrons | Invasive Species Ecology | Mollusks | Maoricolpus roseus | Marine and Estuarine Ecology (Incl. Marine Ichthyology) | Number of scallops | Oceans | Marine Biology | Marine Invertebrates | Pecten fumatus | Scallop density | Scallop size | Screwshell density | Substratum type preference | biota |

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  • global : 1d6af690-93f6-11dd-a3ad-00188b4c0af8