Data

Quantitative assessment of direct and indirect impacts of introduced New Zealand screwshells (Maoricolpus roseus) on native soft sediment assemblages

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/941be4c0-7add-11dd-b932-00188b4c0af8&rft.title=Quantitative assessment of direct and indirect impacts of introduced New Zealand screwshells (Maoricolpus roseus) on native soft sediment assemblages&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/941be4c0-7add-11dd-b932-00188b4c0af8&rft.description=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.Maintenance and Update Frequency: notPlannedStatement: 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.&rft.creator=Reid, Anthony &rft.creator=Johnson, Craig, Prof. &rft.creator=Ross, Jeff, Dr &rft.date=2008&rft.coverage=westlimit=147.3; southlimit=-43.1; eastlimit=147.4; northlimit=-43.0&rft.coverage=westlimit=147.3; southlimit=-43.1; eastlimit=147.4; northlimit=-43.0&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=Oceans | Marine Biology | Marine Invertebrates&rft_subject=COMMUNITY STRUCTURE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=Biosphere | Ecological Dynamics | Competition&rft_subject=24 079001&rft_subject=Maoricolpus roseus&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=Animal density&rft_subject=Species richness&rft_subject=Sediment size structure&rft_subject=Organic matter content&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 2.5 Australia License
http://creativecommons.org/licenses/by/2.5/au/

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.

Access:

Other

Brief description

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.

Lineage

Maintenance and Update Frequency: notPlanned
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.

Notes

Credit
School of Zoology, University of Tasmania
Credit
Natural Heritage Trust (NHT) Grant from DEH
Purpose
To investigate the impacts of an introduced screwshell on community structure of a native soft-sediment assemblages in SE Tasmania.

Created: 05 09 2008

Data time period: 2004-12-12 to 2006-10-10

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related Organisations

Related People

147.4,-43 147.4,-43.1 147.3,-43.1 147.3,-43 147.4,-43

147.35,-43.05

text: westlimit=147.3; southlimit=-43.1; eastlimit=147.4; northlimit=-43.0

text: uplimit=12; downlimit=

Subjects
24 079001 | AQUATIC ECOSYSTEMS | Animal density | Benthic Habitat | Biological Sciences | BIOSPHERE | Biosphere | Ecological Dynamics | Competition | COMMUNITY DYNAMICS | Community Structure | EARTH SCIENCE | Ecological Applications | ECOLOGICAL DYNAMICS | Ecology | Environmental Sciences | Invasive Species Ecology | Maoricolpus roseus | Marine and Estuarine Ecology (Incl. Marine Ichthyology) | Oceans | Marine Biology | Marine Invertebrates | Organic matter content | Sediment size structure | Species richness | biota |

User Contributed Tags    

Login to tag this record with meaningful keywords to make it easier to discover

Other Information
Identifiers
  • global : 941be4c0-7add-11dd-b932-00188b4c0af8