Data · collection · 2003
Soft sediment assemblages at Casey Station: Spatial variation and human impacts. (core samples: Oct-Dec 1997)
Listed in NASA Earthdata CMR
A survey of macrobenthic assemblages in soft-sediments was done at Casey Station, East Antarctica.
Description
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.
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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
Links
Get the data
- Download point for the data data.aad.gov.au/eds/1298/download ↗
download · from NASA CMR
Where it is published
- DOI doi.org/10.4225/15/55f762224d664 ↗
DOI / persistent id · from NASA CMR
Documentation and papers
- data.aad.gov.au /aadc/metadata/citation.cfm?entry_id=ASAC_2201_Casey_benthic_su… ↗
Citation reference for this metadata record and dataset
documentation · from NASA CMR
- Public information for ASAC project 1100 secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=1100 ↗
project · from NASA CMR
- Public information for ASAC project 2201 secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2201 ↗
project · from NASA CMR
Catalogue records · 2
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214312603-AU_AADC.umm_json ↗
metadata API · from NASA CMR
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214312603-AU_AADC.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Contaminant Levels/Spills · CORING DEVICES · FIELD INVESTIGATION
- Inferred from text
- Quaternary environments 75%
Provenance · 1 source records, 12 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214312603-AU_AADC | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].anzsrc:field:370905 | enrichment · NASA CMR | taxonomy-embedding@1.1.0 | title+keywords+description (75%) |
| concepts[instrument].gcmd_instrument:coring-devices | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/human-dimensions/environmental-impacts/contaminant-levels-spills | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:field-investigation | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |