Data

Soft sediment assemblages at Casey Station: Spatial variation and human impacts. (core samples: Oct-Dec 1997)

Australian Ocean Data Network
RIDDLE, MARTIN J. ; STARK, JONATHAN SEAN ; Riddle, M.J. and Stark, J.S. ; Australian Antarctic Division ; Australian Antarctic Data Centre
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=info:doidoi:10.4225/15/55F762224D664&rft.title=Soft sediment assemblages at Casey Station: Spatial variation and human impacts. (core samples: Oct-Dec 1997)&rft.identifier=doi:10.4225/15/55F762224D664&rft.publisher=Australian Antarctic Division&rft.description=A survey of macrobenthic assemblages in soft-sediments was done at Casey Station, East Antarctica. Samples were taken by divers using hand-held corers (core size - 10 cm diameter by 10 cm deep). The aims were: 1) To examine spatial variation at several scales in these assemblages; 2) To determine if there were differences between potentially impacted areas and control areas; 3) To determine the level of replication, taxonomic resolution and data transformation that are appropriate to studies of human impacts in Antarctic soft-sediment assemblages. Cores were collected by divers in a hierarchical, spatially nested design incorporating 4 scales: Locations (1000s of metres apart), Sites (100s of metres), Plots (10s of metres) and among replicates within plots (~1 metre). Four replicates for infaunal analysis were collected from each plot. Variation at the whole assemblage level was most significant at the largest scale: between Locations; but significant differences were also found between Plots within Sites, and between Sites within Locations. The impacted locations, near two waste tips, a sewage outfall and a wharf, as a group were significantly different to control locations. Impacted locations had less variable assemblages but more variable populations of dominant species than control locations. Control locations had greater richness and diversity than impacted locations. Patterns of assemblage structure were similar at fine (species and family) and medium (family to order) levels of taxonomic resolution but changed at coarse (phylum) levels of resolution. Assemblage patterns were similar between untransformed, square root and fourth root transformations but often different in presence/absence transformations. Concentrations of metals in sediments were also analysed and other environmental variables such as grain size and water depth were measured (two replicates from each plot). Multivariate correlations between the biological and environmental datasets were examined. Links to ASAC 1100. The fields in this dataset are: Location Site/Plot Replicate Antimony Arsenic Cadmium Chromium Copper Iron Lead Manganese Mercury Nickel Silver Tin Zinc Weight ToxicityGammarid, Isopod, gastropod faunas identified at the Australian Museum. Remaining faunas identified by J. Stark.&rft.creator=RIDDLE, MARTIN J. &rft.creator=STARK, JONATHAN SEAN &rft.creator=Riddle, M.J. and Stark, J.S. &rft.creator=Australian Antarctic Division &rft.creator=Australian Antarctic Data Centre &rft.date=2001&rft.coverage=northlimit=-66.25833; southlimit=-66.34952; westlimit=110; eastLimit=110.53687&rft.coverage=northlimit=-66.25833; southlimit=-66.34952; westlimit=110; eastLimit=110.53687&rft_rights=These data are publicly available for download from the provided URL.&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2201_Casey_benthic_survey2 when using these data.&rft_subject=biota&rft_subject=environment&rft_subject=oceans&rft_subject=transportation&rft_subject=CONTAMINANT LEVELS/SPILLS&rft_subject=EARTH SCIENCE&rft_subject=HUMAN DIMENSIONS&rft_subject=ENVIRONMENTAL IMPACTS&rft_subject=ANTIMONY&rft_subject=ARSENIC&rft_subject=ASSEMBLAGE&rft_subject=CADMIUM&rft_subject=BENTHIC&rft_subject=CHROMIUM&rft_subject=COMMUNITY&rft_subject=COPPER&rft_subject=CORE SAMPLES&rft_subject=IRON&rft_subject=HUMAN IMPACT&rft_subject=LOCATION&rft_subject=LEAD&rft_subject=CORING DEVICES&rft_subject=FIELD INVESTIGATION&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=CEOS&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data

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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2201_Casey_benthic_survey2 when using these data.

These data are publicly available for download from the provided URL.

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Full description

A survey of macrobenthic assemblages in soft-sediments was done at Casey Station, East Antarctica. Samples were taken by divers using hand-held corers (core size - 10 cm diameter by 10 cm deep). The aims were: 1) To examine spatial variation at several scales in these assemblages; 2) To determine if there were differences between potentially impacted areas and control areas; 3) To determine the level of replication, taxonomic resolution and data transformation that are appropriate to studies of human impacts in Antarctic soft-sediment assemblages. Cores were collected by divers in a hierarchical, spatially nested design incorporating 4 scales: Locations (1000s of metres apart), Sites (100s of metres), Plots (10s of metres) and among replicates within plots (~1 metre). Four replicates for infaunal analysis were collected from each plot.
Variation at the whole assemblage level was most significant at the largest scale: between Locations; but significant differences were also found between Plots within Sites, and between Sites within Locations. The impacted locations, near two waste tips, a sewage outfall and a wharf, as a group were significantly different to control locations. Impacted locations had less variable assemblages but more variable populations of dominant species than control locations. Control locations had greater richness and diversity than impacted locations. Patterns of assemblage structure were similar at fine (species and family) and medium (family to order) levels of taxonomic resolution but changed at coarse (phylum) levels of resolution. Assemblage patterns were similar between untransformed, square root and fourth root transformations but often different in presence/absence transformations.

Concentrations of metals in sediments were also analysed and other environmental variables such as grain size and water depth were measured (two replicates from each plot). Multivariate correlations between the biological and environmental datasets were examined.

Links to ASAC 1100.

The fields in this dataset are:

Location
Site/Plot
Replicate
Antimony
Arsenic
Cadmium
Chromium
Copper
Iron
Lead
Manganese
Mercury
Nickel
Silver
Tin
Zinc
Weight
Toxicity

Lineage

Gammarid, Isopod, gastropod faunas identified at the Australian Museum. Remaining faunas identified by J. Stark.

Issued: 20010501

Data time period: 1997-10-22 to 1997-12-31

Click to explore relationships graph

110.53687,-66.25833 110.53687,-66.34952 110,-66.34952 110,-66.25833 110.53687,-66.25833

110.268435,-66.303925

text: northlimit=-66.25833; southlimit=-66.34952; westlimit=110; eastLimit=110.53687

Other Information
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uri : https://data.aad.gov.au/eds/1298/download

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PROJECT HOME PAGE

uri : https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2201

Public information for ASAC project 2201

PROJECT HOME PAGE

uri : https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=1100

Public information for ASAC project 1100

VIEW RELATED INFORMATION

uri : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2201_Casey_benthic_survey2

Citation reference for this metadata record and dataset

Data Set Citation

uri : https://data.aad.gov.au/metadata/records/ASAC_2201_Casey_benthic_survey2

Soft sediment assemblages at Casey Station: Spatial variation and human impacts. (core samples: Oct-Dec 1997)

Identifiers