IMAS Metadata Catalogue
Quantitative assessment of direct and indirect impacts of introduced New Zealand screwshells (Maoricolpus roseus) on native soft sediment assemblages
We used an in situ manipulative experiment to assess the impacts of the introduced New Zealand screwshell, Maoricolpus roseus, on native soft-sediment community structure and habitat characteristics in SE Tasmania. Impacts were assessed for high and low screwshell density and for the effect of live and dead screwshells, as well as those containing hermit crabs.
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 impacts of an introduced screwshell on community structure of a native soft-sediment assemblages in SE Tasmania.
- 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
- 2004-12-12 2006-10-10
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
- Oceans | Marine Biology | Marine Invertebrates
- Biosphere | Ecological Dynamics | Community Structure
- Biosphere | Ecological Dynamics | Competition
- CAAB - Codes for Australian Aquatic Biota v2
-
- 24 079001
- Maoricolpus roseus
- Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
- Keywords (Theme)
-
- Animal density
- Species richness
- Sediment size structure
- Organic matter content
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
-
Animal density
- Name
- Number per 0.25m2
- Name
-
Species richness
- Name
- Number of taxa per 0.25m2
- Name
-
Sediment size structure
- Name
-
Organic matter content
Distribution Information
- Distribution format
-
-
Excel
-
Excel
Distributor
Resource lineage
- Statement
- Methodologies The study site was at Bligh Point, d' Entrecasteaux Channel, SE Tasmania. Treatments included 3 levels of substratum type (live, dead and empty screwshells, and screwshells with 50% occupancy by hermit crabs) crossed with 3 levels of screwshell density (high and low). There were 4 replicates of each treatment. Experimental plots were 0.75x0.75m, with a 100mm PVC frame to maintain the initial densities of screwshells and hermit crabs. Two control plots were also used - using PVC frames over unmanipulated areas devoid of screwshells, and unmanipulated areas without screwshells or a PVC frame. Screwshell collection Maoricolpus roseus were collected from Dennes point (43'03.618 S, 147'19.703 E) in 12m using a dredge with an opening of 630x350x320mm towed at an average speed of 1km/hr for a period of 5 minutes on 12 December 2004. Screwshells were held in laboratory aquaria at the University of Tasmania until deployed randomly in experimental plots on 14 December 2004. Dead and empty screwshells were obtained from Blackman's Bay beach (43'00.085S, 147'19.577E). The plots were maintained (including adding screwshells when needed) for 20 months before being destructively sampled. To avoid edge effects, a 0.5x0.5m quadrat was used to delineate the inner most 0.25m-2 area of each plot. Within this area, all biota were collected and sediment samples collected. Six sediment cores 80x30mm were extracted from each plot. Cores for sediment size structure were stored at -4 C and sieved through a series of mesh sizes and drying these at 105 C for 24 hours. Cores for analysing organic matter were stored at -80 C before being dried at 105 C for 24 hours, and organic matter calculated using a loss on ignition procedure (550 C for 4 hours). Screwshells (and associated epifauna) were removed from plots and fixed in 5% formaldehyde. Each plot was also the suction sampled to 100mm using a custom made air lift. Suction samples were fixed in 5% formaldehyde with Rose Bengal stain. In the laboratory, epifauna attached to screwshells were counted, removed and stored in 70% alcohol. Samples were sieved over 4, 2 and 1 mm mesh sizes. All infauna was removed from the 4mm portions, but the 2 and 1mm aliquots were split using a Jones-Style riffle splitter into quarters, and 2 were analysed. All infauna was removed to 70% alcohol, counted and identified to family level or species where possible.
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
-
941be4c0-7add-11dd-b932-00188b4c0af8
- 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/941be4c0-7add-11dd-b932-00188b4c0af8
Point of truth URL of this metadata record
- Date info (Creation)
- 2015-07-21T14:53:04
- Date info (Revision)
- 2015-07-21T14:53:04
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available