Dataset

De Beers Marine Namibia Benthic Monitoring Programme

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

License: De Beers Marine Namibia kindly allowed the data to be made public. The data are and remain property of De Beers Marine Namibia. The scientists involved in the collection of these datasets should be acknowledged, and a citation to the dataset (similar to the one suggested in this metadata record) should be included in any analysis or other work that makes substantial use of these data.

URL: http://ipt.iobis.org/afrobis/resource?r=de_beers_marine_namibia__benthos

Contacts:

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

14,704
occurrence records
253
taxa
144
species

Taxa

Missing and invalid fields

Field Missing Invalid
coordinateUncertaintyInMeters 14,704
100.0%
eventDate 14,704
100.0%
maximumDepthInMeters 2,307
15.7%
minimumDepthInMeters 2,307
15.7%
occurrenceStatus 14,704
100.0%
scientificNameID 1,183
8.0%

Quality flags

The OBIS data quality flags are documented at https://github.com/iobis/obis-qc.

Flag Dropped Records
NO_DEPTH 2,307
15.7%
WORMS_ANNOTATION_RESOLVABLE 820
5.6%
NO_MATCH 199
1.4%
WORMS_ANNOTATION_REJECT_AMBIGUOUS 195
1.3%
WORMS_ANNOTATION_RESOLVABLE_LOSS 85
0.6%
MARINE_UNSURE 8
0.1%
NO_ACCEPTED_NAME 4
0.0%

Measurement types

DNA derived data