Unique zooplankton diversity in the deep Nansen and Amundsen basins of the Arctic Ocean - Anette Wold

➢How do these changes affect the plankton communities? ➢ Will the advection of Atlantic species lead to a shift in the zooplankton communities? ➢ Will changes in zooplankton have cascading effects on higher trophic levels? ➢What does this study provide? ➢ Inventory of the current status of the zooplankton composition in Nansen & Amundsen Basins based on the Nansen Legacy research ➢ Comparison of t. [...] glacialis & Metridia longa contributes to the biomass of the southern Nansen Basin Biomass (mg DM m-2) of Macrozooplankton taxa based on Multinet & MIK Note different scale ➢ Chaetognaths and euphausiids have contribute to the biomass in the southern Nansen Basin Small copepods – species composition & depth distribution Rare species (not quantified) Amundsen Basin: Atrophia glacialis Bathykorus bo. [...] conifera only in NB ➢ Microclanaus spp., Microcetella norvegica & Pseudocalanus spp.: ➢ ➢ Relative high abundance (> 2000 ind m-3) of high numbers in surface waters in NB cyclopoid nauplii in AB (not shown in figure) ➢ Many «rare species» not quantified in AB Calanus spp. [...] glacialis ➢ High diversity of large copepods at all depths, with lower in surface water of NB abundance in the deepest (<600 m) layers. [...] Amphipods, Euphasiids & gelatinous zooplankton ➢ In addition species present in low numbers not quantified such as : ➢ Euphasiids mainly present in the south ➢ Narcomedusae: Aeginopsis laurentii, Bathykorus bouilloni, Solmundella bitentaculata ➢ Amphipods present in both basins ➢ Trachymedusae: Sminthea arctica, Homoeonema platygonon, Plotocnide borealis ➢ Siphonophora: Muggiaea bargmannae, Crysta.