Zooplankton and micronekton vertical distribution and diel vertical migration behaviour in the Northern North Atlantic Ocean ...

• Main Authors: Klevjer, Thor, Norheim, Eirik, Aksnes, Dag, Strand, Espen, Knutsen, Tor, Melle, Webjørn, Wiebe, Peter
• Format: Conference Object
• Language: unknown
• Published: ASC 2015 - Theme session S 2024
• Subjects: Oceanic Northeast Atlantic ICES Ecoregion; Ecosystem observation, processes and dynamics; Irminger Sea; Norwegian Sea; Iceland; Labrador Sea; North Atlantic; Northeast Atlantic
• Online Access: https://dx.doi.org/10.17895/ices.pub.25682799.v1; https://ices-library.figshare.com/articles/conference_contribution/Zooplankton_and_micronekton_vertical_distribution_and_diel_vertical_migration_behaviour_in_the_Northern_North_Atlantic_Ocean/25682799/1

No abstracts are to be cited without prior reference to the author.During the Norwegian Trans-Atlantic cruise covering the central parts of four north Atlantic ocean basins, the Norwegian Sea (NS), Iceland Sea (ICS), Irminger Sea (IRS), and Labrador Sea (LS), data on vertical distributions of mesozooplankton to micronekton components were collected using a combination of hull-mounted and towed multi-frequency acoustics, OPC (Optical Particle Counter), and VPR (Video Plankton Recorder). In addition, data on both surface light, as well as the light regimes in different hydrographical regions were collected. Daytime depths of mesopelagic scattering layers showed strong correlation with optical conditions, with shallow daytime distributions occurring in regions with low light penetration, and deeper daytime distributions in regions with clearer waters. For micronekton, DVM behaviour in the eastern basins (NS and ICS) was heavily influenced by the short summer nights, with duration of nocturnal descent coinciding ...