Dataset of the multidisciplinary research surveys in the seamounts of Ewing and Valdivia Bank (Walvis Ridge) - SE Atlantic

Luis López-Abellán; Luis López-Abellán; Roberto Sarralde Vizuete; José González Jiménez

doi:10.14284/58

Dataset of the multidisciplinary research surveys in the seamounts of Ewing and Valdivia Bank (Walvis Ridge) - SE Atlantic

Citation

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 https://dx.doi.org/10.14284/58 accessed via GBIF.org on 2024-12-14.

Description

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

Sampling Description

Study Extent

Entire sampling area

Sampling

Lofoten bottom trawling; Beam trawling; Rock dredging

Method steps

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.
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.
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.

Additional info

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).

Taxonomic Coverages

urn:lsid:marinespecies.org:taxname:1065

Arthropoda
rank: phylum

urn:lsid:marinespecies.org:taxname:1821

Chordata
rank: phylum

urn:lsid:marinespecies.org:taxname:1267

Cnidaria
rank: phylum

urn:lsid:marinespecies.org:taxname:1806

Echinodermata
rank: phylum

urn:lsid:marinespecies.org:taxname:51

Molluscs
rank: phylum

urn:lsid:marinespecies.org:taxname:558

Porifera
rank: phylum

Geographic Coverages

EurOBIS calculated BBOX > station Bounding Box

PSW, Walvis Ridge > station Valdivia Bank

PSW, Walvis Ridge > station Ewing Seamount

Bibliographic Citations

Contacts

Luis López-Abellán
originator
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias

Roberto Sarralde Vizuete
originator
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias

José González Jiménez
originator
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias

originator
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias

metadata author
Flanders Marine Institute (VLIZ)
BE
email: info@vliz.be
homepage: https://www.vliz.be

José González Jiménez
processor
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias

Luis López-Abellán
administrative point of contact
Spanish Ministry of Economy and Competiveness; Instituto Español de Oceanografía; Centro Oceanográfico de Canarias