Net sampling to assess the cephalopod biodiversity of Cabo Verde

DOI

Net catches of cephalopods were obtained during the cruises POS320/2 (March 2005), MSM49 (November/December 2015) and WH383 (March/April 2015) off Cabo Verde at a total of 18 stations at depths between 0 and 1000 m. Cephalopods were caught during POS320/2 with either a Isaacs-Kidd midwater trawl (IKMT) with a 6 m2 net opening, 4 mm mesh size equipped with a flowmeter, a Hydro-Bios Multinet Maxi with a 0.5 m2 net opening and 500 µm mesh size between the surface and 250 m water depth, or an 80 feet bottom trawl. Net sampling during MSM49 was conducted with two types of multiple opening/closing nets (MOCNESS) and an IKMT. The smaller MOCNESS had a net opening of 1 m2 opening (three nets with a mesh size of 2 mm and six nets with a mesh size of 335 μm) and the larger MOCNESS a net opening of 10 m2 opening (five nets, mesh size: 1.5 mm) and were deployed between the surface to 1000 m. The IKMT had a net opening of 7 m2 and ended in a cod end of 500 µm mesh size. It was deployed to a maximum depth of 500 m. During WH383 a pelagic trawl ('Aalnetz', Engel Netze, Bremerhaven, Germany) with a mouth opening of 16 x 30 m, length of 150 m including multiple opening-closing device, 260 meshes by 180 cm stretched mesh size at the front, a cod end 20 mm stretched mesh-opening and a 1.8 mm inlet sewn into last 1 m of cod end was used with a multisampler (Construction Services AS, Bergen, Norway) allowing depth-stratified sampling. During WH383 three strata (mean vertical extension of ca. 40 m) were trawled mostly during night and one time during daytime at depths between 30 and 700 m in horizontal tows for 30 minutes per stratum with a mean speed of three knots (2.8-3.3 kn). During this cruise, night trawls took place at 22:00 local time, and the day-time trawl at 12:00 local time. Onboard, cephalopods were identified morphologically to the lowest taxonomic level possible (species, genus or family), and whole specimens were preserved in formalin as voucher.

Identifier
DOI https://doi.org/10.1594/PANGAEA.937564
Related Identifier IsPartOf https://doi.org/10.1594/PANGAEA.937568
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.937564
Provenance
Creator Merten, Veronique ORCID logo; Bayer, Till ORCID logo; Reusch, Thorsten B H ORCID logo; Puebla, Oscar ORCID logo; Fuss, Janina ORCID logo; Stefanschitz, Julia ORCID logo; Lischka, Alexandra ORCID logo; Hauss, Helena ORCID logo; Neitzel, Philipp; Piatkowski, Uwe ORCID logo; Czudaj, Stephanie ORCID logo; Christiansen, Bernd; Denda, Anneke; Hoving, Henk-Jan T ORCID logo
Publisher PANGAEA
Publication Year 2021
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 9291 data points
Discipline Earth System Research
Spatial Coverage (-24.998W, 16.886S, -24.227E, 17.668N); South Atlantic Ocean; Atlantic Ocean; Eastern Central Atlantic Ocean
Temporal Coverage Begin 2005-04-12T00:00:00Z
Temporal Coverage End 2015-12-19T00:00:00Z