IMAS Metadata Catalogue
Larval transport of the introduced Northern Pacific Seastar (Asterias amurensis) in the Derwent Estuary, SE Tasmania
This study assessed the spatial and temporal (horizontal and vertical) distribution of Asterias amurensis larvae in the Derwent Estuary and adjacent Storm Bay, SE Tasmania.
Horizontal transport and development was assessed by collecting plankton samples at 2 or 4 week intervals, from July to December 2001, at 4 sites in the Derwent Estuary and 6 sites in Storm Bay.
The effects of light and salinity on vertical distribution of larvae was examined over a 24 hour tidal and diel cycle.
Simple
Identification info
- Date (Creation)
- 2008-09-10T08:20:00
Principal investigator
School of Zoology, University of Tasmania (UTAS) - Koch, Sara (Honours student)
Private Bag 5
Hobart
Tasmania
7001
Australia
Point of contact
School of Zoology, University of Tasmania (UTAS) - Johnson, Craig, Prof. (Honours supervisor)
Private Bag 5
Hobart
Tasmania
7001
Australia
- Purpose
- To investigate temporal and spatial (horizontal and vertical) dispersal of introduced northern Pacific seastar larvae in the Derwent Estuary, SE Tasmania.
- Credit
- Department of Sustainability and Environment (DSE), Victoria
- Status
- Completed
Principal investigator
Point of contact
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
- Temporal resolution
-
P0Y1M0DT0H0M0S
- Topic category
-
- Biota
Extent
N
S
E
W
))
Temporal extent
- Time period
- 2001-07-01T13:51:00 2001-12-31T13:51:00
Vertical element
- Minimum value
- 0
- Maximum value
- 12
- Identifier
- EPSG::5715
- Name
- MSL depth
- Maintenance and update frequency
- Not planned
Resource format
- Title
- Microsoft Excel (xls)
- Date
- Edition
- 2003
- Global Change Master Directory Earth Science keywords v.5.3.8
-
- Biosphere | Zoology | Echinoderms
- Biosphere | Aquatic Habitat | Reef Habitat
- CAAB - Codes for Australian Aquatic Biota v2
-
- 25 154001
- Asterias amurensis
- Keywords (Theme)
-
- Larval distribution
- Introduced species
- Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
- Keywords (Theme)
-
- Larval abundance
- Relative frequency of larval stages
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
- The data described in this record are the intellectual property of S. Koch.
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
- Contact C. Johnson for access to data. Data will not be made available until published.
- Language
- English
- Character encoding
- UTF8
- Supplemental Information
- Koch, S. (2002). Larval transport of the introduced northern Pacific seastar, Asterias amurensis, in the Derwent Estuary, Tasmania. Honours thesis, University of Tasmania.
Content Information
- Content type
- Physical measurement
- Name
-
Larval abundance
- Name
- Number per cubic metre
- Name
-
Relative frequency of larval stages
Distribution Information
- Distribution format
-
-
Microsoft Excel (xls)
-
Microsoft Excel (xls)
Distributor
Resource lineage
- Statement
- Larvae were collected in the Derwent Estuary at several sites, from the Port of Hobart to the mouth of the estuary, and from the adjacent inshore waters of Storm Bay. Horizontal distribution Plankton samples were collected at four sites within the Derwent Estuary and six sites in Storm Bay. The sampling strategy included paired sites on both shores of the estuary, a site at the mouth of the estuary and stations in Storm Bay, which was likely to be in the path of water exiting the Derwent Estuary. Three replicate plankton samples were taken at sites once a month from September to December 2001. From July to December a 2-4 times weekly sampling strategy was used at Sullivans Cove. Plankton samples were collected using a weighted free-fall vertical drop net to sample the entire water column (75cm mouth diameter, 100um mesh). The net was fitted with a depth gauge and choke collar to prevent the net from sampling on retrieval. The net fall rate was 0.8m/s. The net was allowed to fall to as close to the bottom as possible. The volume of water filtered was estimated as a product of the maximum depth sampled by the area of the mouth of the net. One plankton sample from each station was fixed in 70% or 90% ethanol for genetic testing and all other samples fixed in unbuffered 10% formaldehyde/seawater solution, then stored until sorted. Vertical distribution To assess the vertical distribution and abundance of larvae in the field, larvae were collected at Sullivans Cove during a first quarter moon tidal period at four time intervals (dawn=0540-0900, day=1100-1400, dusk=1820-2120, night=2340-0300) on 21 October 2001. On each occasion, 3 replicate samples were taken at each of 4 depths: just below the surface, 1m below the halocline at 3m, mid-depth at 7m and 1m above the bottom, at a depth of 12m. All samples were collected using a petrol-driven diaphragm pump. Larvae were collected by pumping water from each depth stratum for ten minutes with the pumping rate held constant at 210 L/min, in other words sampling an average of 2 m-3 of water for each replicate sample. Filtration was achieved by directing the outflow of the pump into a partially submerged plankton net (100um mesh) to minimise damage to the larvae. All samples were fixed in an unbuffered 10% formalin seawater solution. Vertical profiles of temperature and salinity were taken using a salinity/temperature meter (WTW Microprocessor conductivity meter LF 196) before sampling commenced.
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
-
c9c14900-7eb9-11dd-980a-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/c9c14900-7eb9-11dd-980a-00188b4c0af8
Point of truth URL of this metadata record
- Date info (Creation)
- 2019-03-07T08:24:00
- Date info (Revision)
- 2019-03-07T08:24:00
Metadata standard
- Title
- ISO 19115-3:2018
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available