Hoving, Henk-Jan T. (2019) Cruise Summary Report POS532. . UNSPECIFIED, 4 pp.

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Abstract

The aim of this cruise was to investigate the role of gelatinous zooplankton in the biological carbon pump, i.e. transporting carbon from the surface into the deep sea. In addition, the cruise aimed to better understand the biodiversity, abundance and distribution of pelagic fauna including nekton and macrozooplankton in the Cape Verde region, and to provide one of the first bottom surveys in the coastal deep seas of Cape Verde. The latter
resulting in new faunal records and biological observations.
We used the manned submersible JAGO (17 dives), the towed camera system PELAGIOS (13 deployments), and two kinds of multinet (midi and maxi) (14 and 7 hauls respectively). Biological specimens were preserved as voucher specimens and samples were obtained for DNA barcoding. CTD sampling was performed to collect
hydrographic data. We also collected water samples for environmental DNA and to analyze these samples in the lab for traces of deep-sea organisms such cephalopods. To quantify pelagic biomass and track migration via bioacoustics we used an EK80. Elaborate physical sampling around the islands was performed using CTD and ADCP. In the leeway of the islands Santo Antão and Fogo we performed mesopelagic stations (1000 m) and
bathypelagic stations (3000 m) using the mentioned instruments. An offshore mesoscale eddy was sampled with all our oceanographic instruments. Additionally we performed a full oceanographic and biological sampling at the
Cape Verde Ocean Observatory, north of Sao Vicente.

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