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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.\nVariation 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.\nConcentrations 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.\nLinks to ASAC 1100.\nThe fields in this dataset are:\nLocation\nSite/Plot\nReplicate\nAntimony\nArsenic\nCadmium\nChromium\nCopper\nIron\nLead\nManganese\nMercury\nNickel\nSilver\nTin\nZinc\nWeight\nToxicity", "num_resources": 5, "num_tags": 21, "organization": {"id": "0143757a-86ab-43e4-bba6-4a3a2a02b6c4", "name": "australian-ocean-data-network", "title": "Australian Ocean Data Network", "type": "organization", "description": "Harvester for Australian Ocean Data Network", "image_url": "", "created": "2025-06-23T12:29:10.320926", "is_organization": true, "approval_status": "approved", "state": "active"}, "original_harvest_source": {"site_url": "https://catalogue.aodn.org.au", "href": "https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/soft-sediment-assemblages-at-casey-station-spatial-variation-and-human-impacts-core-sample-19971", "title": "Australian Oceans Data Network"}, "owner_org": "0143757a-86ab-43e4-bba6-4a3a2a02b6c4", "private": false, "promotion_level": "0", "spatial": "{\"type\": \"Polygon\", \"coordinates\": [[[110.0, -66.34952], [110.53687, -66.34952], [110.53687, -66.25833], [110.0, -66.25833], [110.0, -66.34952]]]}", "spatial_coverage": "{\"type\": \"Polygon\", \"coordinates\": [[[110.0, -66.34952], [110.53687, -66.34952], [110.53687, -66.25833], [110.0, -66.25833], [110.0, -66.34952]]]}", "state": "active", "temporal_coverage_from": "1997-10-22 00:00:00", "temporal_coverage_to": "1997-12-31 00:00:00", "title": "Soft sediment assemblages at Casey Station: Spatial variation and human impacts. 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