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

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

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