Net sampling to assess the cephalopod biodiversity of Cabo Verde

• Main Authors: Merten, Veronique, Bayer, Till, Reusch, Thorsten B H, Puebla, Oscar, Fuss, Janina, Stefanschitz, Julia, Lischka, Alexandra, Hauss, Helena, Neitzel, Philipp, Piatkowski, Uwe, Czudaj, Stephanie, Christiansen, Bernd, Denda, Anneke, Hoving, Henk-Jan T
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Atlantic Ocean; Cabo Verde; Cephalopods; Comment; Cruise/expedition; CT; DATE/TIME; Depth; bottom/max; nominal; top/min; Eastern Central Atlantic Ocean; environmental DNA; Gear; Haul; Identification; IKMT; in situ observations; Isaac-Kid-Midwater Trawl; Maria S. Merian; metabarcoding; Midwater trawl; MOC1; MOC10; MOCNESS opening/closing plankton net 10 sqm; MOCNESS opening/closing plankton net 1 sqm; MSM49; MSM49_583-14; MSM49_583-3; MSM49_583-7; MSM49_583-8; MWT; North Atlantic Ocean; POS320/2; POS320/2-track; Poseidon; Sample code/label; Station label; Taxon/taxa; Underway cruise track measurements; Walther Herwig III; WH383; WH383_341-110; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.937564; https://doi.org/10.1594/PANGAEA.937564

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.