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Dataset of the multidisciplinary research surveys in the seamounts of Ewing and Valdivia Bank (Walvis Ridge) - SE Atlantic
Citable as data publication
López-Abellán, L. J.; Sarralde Vizuete, R.; González Jiménez, J. F.; Centro Oceanográfico de Canarias – IEO, Spain (2015). Dataset of the multidisciplinary research surveys in the seamounts of Ewing and Valdivia Bank (Walvis Ridge) - SE Atlantic. http://dx.doi.org/10.14284/58

Access data
Archived data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

Description
The dataset is the result of the sampling conducted between 2008 and 2010 on the R/V Vizconde de Eza. more

The three multidisciplinary research surveys on board the R/V Vizconde de Eza (Secretaría General de Pesca Marítima) were performed in the seamounts of Ewing and Valdivia Bank (Walvis Ridge) as a collaborative work between Spain and Namibia trough the Instituto Español de Oceanografía (IEO) and the National Marine Information and Research Centre of Swakopmund (NatMIRC). Studies on biodiversity, acoustic and geophysics, hydrography, and seabird and cetacean observations were conducted. A total of 15 823 km² were surveyed with a multibeam echosounder and 1462 km of seismic profiles, using an ultra-high resolution parametric sounder. The depth ranged between 218 m at the outcrop in the South-eastern sector of Valdivia Bank and 3000 m in the southern part of our study. A total of 210 species of fish, 60 crustaceans and 32 cephalopods were recorded. Species diversity increased by depth and four assemblages by depth strata were found: shallower (200-300 m); slope (300 - 800 m); upper deep (800 - 1300 m); and deep (1300 - 2000 m).

Scope
Themes:
Biology, Biology > Benthos, Biology > Ecology - biodiversity, Biology > Fish
Keywords:
Marine, Seamounts, PSW, Walvis Ridge, Arthropoda, Chordata, Cnidaria, Echinodermata, Molluscs, Porifera

Geographical coverage
PSW, Walvis Ridge Stations [Marine Regions]
Valdivia Bank
Coordinates: MinLong: 4,871; MinLat: -24,39 - MaxLong: 6,729; MaxLat: -26,82 [WGS84]
Ewing Seamount
Coordinates: MinLong: 7,92; MinLat: -23,01 - MaxLong: 8,54; MaxLat: -23,39 [WGS84]

Temporal coverage
2 February 2008 - 26 February 2010
Yearly

Taxonomic coverage
Arthropoda [WoRMS]
Chordata [WoRMS]
Cnidaria [WoRMS]
Echinodermata [WoRMS]
Mollusca [WoRMS]
Porifera [WoRMS]

Parameters
Bathypelagic fauna biomass Methodology , Bathypelagic fauna density Methodology , Benthos biomass Methodology , Benthos density Methodology
Bathypelagic fauna biomass: Lofoten bottom trawling
Sampling was done by towing a Lofoten bottom trawl for 30-minutes at a speed of 3 knots. The Lofoten bottom trawl has following characteristics: Headrope/Footrope = 31.20 m/17.70 m; Rockhopper with 27 rollers of 35 cm; Cod-end mesh size of 35 mm; Horizontal opening 19.93 (between bridles) ; vertical opening 3 m.
Bathypelagic fauna density: Lofoten bottom trawling
Sampling was done by towing a Lofoten bottom trawl for 30-minutes at a speed of 3 knots. The Lofoten bottom trawl has following characteristics: Headrope/Footrope = 31.20 m/17.70 m; Rockhopper with 27 rollers of 35 cm; Cod-end mesh size of 35 mm; Horizontal opening 19.93 (between bridles) ; vertical opening 3 m.
Benthos biomass: Lofoten bottom trawling
Sampling was done by towing a Lofoten bottom trawl for 30-minutes at a speed of 3 knots. The Lofoten bottom trawl has following characteristics: Headrope/Footrope = 31.20 m/17.70 m; Rockhopper with 27 rollers of 35 cm; Cod-end mesh size of 35 mm; Horizontal opening 19.93 (between bridles) ; vertical opening 3 m.

Benthos biomass: Beam trawling
A beam trawl net was towed for 25-minutes at a towing speed of 2 knots. The beam trawl has following characteristics: 4m beam trawl (measured between inside edges of shoes); vertical opening 0.6 m; cod-end mesh size of 25 mm.

Benthos biomass: Rock dredging
A Rock dredge was towed for 15-minutes trawl at a towing speed of 2 knots. The rock dredge has following characteristics: 80 x 30 cm opening; cod-end mesh size of 20 mm.
Benthos density: Rock dredging
A Rock dredge was towed for 15-minutes trawl at a towing speed of 2 knots. The rock dredge has following characteristics: 80 x 30 cm opening; cod-end mesh size of 20 mm.

Benthos density: Beam trawling
A beam trawl net was towed for 25-minutes at a towing speed of 2 knots. The beam trawl has following characteristics: 4m beam trawl (measured between inside edges of shoes); vertical opening 0.6 m; cod-end mesh size of 25 mm.

Benthos density: Lofoten bottom trawling
Sampling was done by towing a Lofoten bottom trawl for 30-minutes at a speed of 3 knots. The Lofoten bottom trawl has following characteristics: Headrope/Footrope = 31.20 m/17.70 m; Rockhopper with 27 rollers of 35 cm; Cod-end mesh size of 35 mm; Horizontal opening 19.93 (between bridles) ; vertical opening 3 m.

Contributors
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía (IEO), moredata owner
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias, moredata creatortaxonomic identifiersample analyser

Related datasets
Published in:
EurOBIS: European Ocean Biogeographic Information System, more

Publication
Based on this dataset:
(2011). Preliminary report of the multidisciplinary research cruise on the Walvis Ridge seamounts (Atlantic Southeast-SEAFO). Instituto Español de Oceanografía/National Marine Information and Research Centre: Madrid, Swakopmund. 191 pp., more
Navarro, S.J. et al. (2011). Seamount associated species (fishes, crustaceans and cephalopods) Namibia-0802, in: (2011). Preliminary report of the multidisciplinary research cruise on the Walvis Ridge seamounts (Atlantic Southeast-SEAFO). pp. 98-191, more

Dataset status: Completed
Data type: Data
Data origin: Research
Metadatarecord created: 2013-02-04
Information last updated: 2015-12-11
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