Net sampling to assess the cephalopod biodiversity of Cabo Verde


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.

Related Identifier IsPartOf
Metadata Access
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;
OpenAccess true
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