Dataset
AfrOBIS Open in mapper Explore occurrences
De Beers Marine Namibia undertake marine diamond mining to depths of 130 m offshore of southern Namibia using remote mining tools. As part of their mining licence agreement with the Government of Namibia, De Beers Marine Namibia have undertaken a number of baseline and impact monitoring surveys with the view to quantitatively assessing the direct and indirect effects of deep-water marine mining on benthic macrofaunal communities, and to monitor post-mining recovery. Benthic grab samples were collected from both mined and unmined sites in 2005 - 2008 and 2011, using a Van Veen grab. Macrofauna was identified, and abundance and biomass determined. The data were made available to AfrOBIS as a series of Excel sheets. At AfrOBIS, the data were quality-controlled and transformed to comply with the Darwin Core/OBIS Schema. Funds for data operations were kindly provided by the Census of Marine Life International Cosmos Prize Fund, through a grant to Rutgers University.
Citation: Steffani, N; Pulfrich, A. (2013). De Beers Marine Namibia Benthic Monitoring Programme. Dataset published by AfrOBIS; consulted via iOBIS
Published: December 02, 2020 at 14:08
URL: http://ipt.iobis.org/afrobis/resource?r=de_beers_marine_namibia__benthos
Andrea Pulfrich
Pisces Environmental Services (Pty) Ltd
Nina Steffani
Marine Environmental Consultant
De Beers Marine Namibia
De Beers Marine Namibia
Ursula von St Ange
AfrOBIS / CSIR
| Field | Missing | Invalid | |
|---|---|---|---|
| coordinateUncertaintyInMeters | 14,704 |
|
|
| eventDate | 14,704 |
|
|
| maximumDepthInMeters | 2,307 |
|
|
| minimumDepthInMeters | 2,307 |
|
|
| occurrenceStatus | 14,704 |
|
|
| scientificNameID | 1,183 |
|
The OBIS data quality flags are documented at https://github.com/iobis/obis-qc.
| Flag | Dropped | Records | |
|---|---|---|---|
| NO_DEPTH | 2,307 |
|
|
| WORMS_ANNOTATION_RESOLVABLE | 820 |
|
|
| NO_MATCH | 199 |
|
|
| WORMS_ANNOTATION_REJECT_AMBIGUOUS | 195 |
|
|
| WORMS_ANNOTATION_RESOLVABLE_LOSS | 85 |
|
|
| MARINE_UNSURE | 8 |
|
|
| NO_ACCEPTED_NAME | 4 |
|