IMAS Metadata Catalogue
Impacts of New Zealand screwshells (Maoricolpus roseus) on native scallop distribution and behaviour
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.
Simple
Identification info
- Date (Creation)
- 2008-09-05T10:27:00
Principal investigator
School of Zoology, University of Tasmania (UTAS) - Reid, Anthony (PhD student)
Private Bag 5
Hobart
Tasmania
7001
Australia
Principal investigator
School of Zoology, University of Tasmania (UTAS) - Johnson, Craig, Prof. (PhD supervisor)
Private Bag 5
Hobart
Tasmania
7001
Australia
Principal investigator
Tasmanian Aquaculture and Fisheries Institute (TAFI) - Ross, Jeff, Dr
Tasmanian Aquaculture and Fisheries Institute, University of Tasmania
Private Bag 49
Hobart
Tasmania
7001
Australia
- Purpose
- To investigate the impact of the introduced New Zealand screwshell (Maoricolpus roseus) on scallop distribution and behaviour.
- Credit
- School of Zoology, University of Tasmania
- Credit
- Natural Heritage Trust (NHT) Grant from DEH
- Status
- Completed
Principal investigator
Principal investigator
Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - Johnson, Craig, Prof.
IMAS - Sandy Bay
Private Bag 129
Hobart
Tasmania
7001
Australia
- Spatial representation type
- Text, table
- Topic category
-
- Biota
Extent
N
S
E
W
))
Temporal extent
- Time period
- 2006-03-10T15:59:00 2007-06-30T15:59:00
Vertical element
- Maximum value
- 12
- Maintenance and update frequency
- Not planned
Resource format
- Title
- Excel
- Date
- Edition
- 2003
- Global Change Master Directory Earth Science Keywords v.5.3.8
-
- Biosphere | Aquatic Habitat | Benthic Habitat
- Biosphere | Ecological Dynamics | Community Structure
- Biosphere | Ecological Dynamics | Competition
- Oceans | Marine Biology | Marine Invertebrates
- Biosphere | Zoology | Mollusks
- CAAB - Codes for Australian Aquatic Biota v2
-
- 24 079001
- Maoricolpus roseus
- 23 270005
- Equichlamys bifrons
- 23 270006
- Chlamys asperrimus
- 23 270007
- Pecten fumatus
- Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
- Keywords (Theme)
-
- Number of scallops
- Scallop density
- Screwshell density
- Scallop size
- Substratum type preference
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
- The data described in this record are the intellectual property of A. Reid.
Resource constraints
- Linkage
-
http://i.creativecommons.org/l/by/2.5/au/88x31.png
License Graphic
- Title
- Creative Commons Attribution 2.5 Australia License
- Website
-
http://creativecommons.org/licenses/by/2.5/au/
License Text
- Other constraints
- 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).
- Other constraints
- This data is yet to be published, please contact the researcher for access to the data.
Associated resource
- Title
- Impacts of the introduced New Zealand screwshell Maoricolpus roseus
- Date (Creation)
- 2011-09-02T00:00:00
- Language
- English
- Character encoding
- UTF8
- Environment description
- Excel spreadsheet (xls)
- Supplemental Information
- Reid, A.P. 2010. Impact of the Introduced New Zealand Screwshell Maoricolpus roseus on Soft-sediment Assemblages in Southeast Tasmania. University of Tasmania PhD thesis
Content Information
- Content type
- Physical measurement
- Name
-
Number of scallops
- Name
- individuals per transect
- Name
-
Scallop density
- Name
- individuals per m2
- Name
-
Screwshell density
- Name
- individuals per m2
- Name
-
Scallop size
- Name
- mm
- Name
-
Substratum type preference
Distribution Information
- Distribution format
-
-
Excel
-
Excel
Distributor
Resource lineage
- 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.
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
-
1d6af690-93f6-11dd-a3ad-00188b4c0af8
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/1d6af690-93f6-11dd-a3ad-00188b4c0af8
Point of truth URL of this metadata record
- Date info (Creation)
- 2015-07-21T14:53:51
- Date info (Revision)
- 2015-07-21T14:53:51
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available