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Community level impacts of Maoricolpus roseus on the function of native soft sediment assemblages

The impact of the introduced New Zealand screw shell, Maoricolpus roseus, were assessed using a cageing experiment in SE Tasmania (Bligh Point, D'Entrecasteaux Channel). Three treatments consisted of different substratum type (live, dead and empty shells, and dead shells with 50% occupancy by hermit crabs); which were crossed with 2 levels of screwshell density (high and low). Treatment groups were artificially maintained for 20 months before metabolic chambers were used to quantify the community metabolism of different treatment groups.

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
61 3 6226 2507
61 3 6226 2745 (facsimile)
>

Principal investigator

School of Zoology, University of Tasmania (UTAS) - Johnson, Craig, Prof. (PhD supervisor)
Private Bag 5
Hobart
Tasmania
7001
Australia
61 3 6226 2582
61 3 6226 2745 (facsimile)
ORCID ID >

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
61 3 6227 7277
61 3 6227 8035 (facsimile)
ORCID ID >

Purpose
To assess community-level impacts of an introduced species on 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

Department of Primary Industries, Parks, Water and Environment (DPIPWE), Tasmanian Government - Reid, Anthony, Dr

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
61 3 6226 2582
ORCID ID >

Spatial representation type
Text, table
Topic category
  • Biota

Extent

N
S
E
W


Temporal extent

Time period
2005-12-01T16:04:00 2007-08-31T16:04:00

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
  • 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
  • Marine and Estuarine Ecology (incl. Marine Ichthyology)
  • Invasive Species Ecology
Keywords (Theme)
  • Epifauna density
  • Biomass
  • Primary production
  • Community respiration
  • Net oxygen flux

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
Epifauna density

Name
Number per 0.25m2
Name
Biomass

Name
Grams
Name
Primary production

Name
mmolO2/0.25m2/day
Name
Community respiration

Name
mmolO2/0.25m2/day
Name
Net oxygen flux

Name
mmolO2/0.25m2/day

Distribution Information

Distribution format
  • Excel

Distributor

Principal investigator

Department of Primary Industries, Parks, Water and Environment (DPIPWE), Tasmanian Government - Reid, Anthony, Dr

Resource lineage

Statement
Experimental design Treatments included 3 levels of substratum type (live screwshells, dead and empty screwshells, and dead screwshells with 50% occupancy by hermit crabs) crossed with 2 levels of screwshell density (200m-2 and 500m-2). There were 4 replicates of each treatment group, and the experiment was maintained over 20 months. After this time, metabolic chambers (described below) were deployed over each experimental plot for 22 hours (encompassing both a day and night time period). Treatment cages comprised 0.75m x 0.75m x 90mm PVC frames. Control groups included cages over unmanipulated areas without screwshells and unmanipulated areas without screwshells or cages. After chamber incubations were complete, 3 x 80 mm sediment cores (30 mm diameter) were extracted from each plot. From these, the biomass of microphytobenthos (MPB) was calculated. Cores were stored at -80 C, MPB biomass was calculated using a 90% acetone extraction on the upper 5mm of each core. In plots containing screwshells, random sub-samples were collected and processed for epiphyte biomass using the acetone extraction method. Epifauna attached to screwshells were counted, removed and stored in 70% alcohol. After cores and shells were removed from each plot, plots were suction-sampled to 100mm depth using a custom made air lift. Samples were fixed in 5% formaldehyde solution with Rose Bengal stain and stored for identification. In the lab samples were sieved over 4mm, 2mm and 1mm mesh sizes. All infauna was removed from the 4mm portion, but the 2mm and 1mm samples were split using a Jones-style riffle splitter into quarters, and 2 of these were sampled. All infauna were removed and stored in 70% alcohol, counted and weighed (wet) using a balance accurate to 0.01g to quantify biomass. Epifaunal biomass were estimated.
Hierarchy level
Dataset

Resource lineage

Statement
Metabolism chambers - design The chambers consisted of a transparent polyvinyl chloride (PVC) cylinder, 300 mm diameter x 200 mm high. One end was sealed (PVC), and the other open and chamfered. A magnetic stirrer attached to the chamber roof controlled circulation. The stirrer was driven by a 9V DC motor, rotated at ca. 8 rpm. Gauges on the chamber sides allowed depth of insertion into the sediment and therefore volume of the chamber to be calculated. An optic fibre dissolved oxygen (DO) probe (Aanderaa oxygen optode 4130) was inserted through the chamber roof and recorded DO concentration and water temperature (degrees) every 10 minutes onto a data logger which was mounted separate to the chamber in a translucent submersible housing (Icolite). The data logger was a Tattletale TFX 1-11.v2 and associated prototype board (Onset computer corp.). Separate data loggers enabled chambers to be controlled separately and data to be stored separately. Photosynthetically Active Radiation (PAR) was measured and logged by 2 independent underwater sensors (Li-cor LI-192SA) mounted on the outer surface of the chamber. Activation of the PAR sensors was controlled by the data logger. For the 10 minute interval between DO readings, the PAR sensor pulsed every 2 minutes and the averages of these 5x2 minute reading was stored on the logger.
Hierarchy level
Collection hardware

Resource lineage

Statement
Validation of chamber accuracy and use When using a closed system chamber to quantify community metabolism, problems can arise if condition within the chamber change (e.g. if oxygen concentration becomes excessively low). To assess if communities responded to reductions in oxygen concentration, 2 paired chambers were deployed in the same randomly selected treatment plot - one with a 12 V DC bilge pump enabling the chamber to be flushed at selected intervals, and the second a standard set-up (no pump). Paired chambers were deployed in 10 randomly selected treatment plots and the flux estimates calculated from the flushed chambers were compared to those from the unflushed chambers. The absence of non-linear oxygen fluxes, coupled with the absence of differences between the oxygen flux obtained from both chambers on the same community, was a clear indication that the community within either chamber did not respond adversely to the changing oxygen concentration within the chambers.
Hierarchy level
Attribute

Metadata

Metadata identifier
302aaf80-7d37-11dd-a8f2-00188b4c0af8

Language
English
Character encoding
UTF8

Point of contact

Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) - IMAS Data Manager

Type of resource

Resource scope
Dataset
Metadata linkage
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/302aaf80-7d37-11dd-a8f2-00188b4c0af8

Point of truth URL of this metadata record

Date info (Creation)
2015-07-21T14:53:39
Date info (Revision)
2015-07-21T14:53:39

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

Spatial extent

N
S
E
W


Keywords

Biomass Community respiration Epifauna density Net oxygen flux Primary production
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

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