Lipid content and stable isotopes of zooplankton during five winters around the northern Antarctic Peninsula ...

• Main Authors: Walsh, Jennifer, Reiss, Christian
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: Antarc*; Antarctic; Antarctic Peninsula; Sea ice; South Shetland Islands; Southern Ocean
• Online Access: https://dx.doi.org/10.5061/dryad.hhmgqnkdx; https://datadryad.org/stash/dataset/doi:10.5061/dryad.hhmgqnkdx

The Southern Ocean zooplankton community is diverse, yet most species are understudied, especially with respect to their overwinter feeding ecologies. This dataset describes body condition and trophic biomarker data (lipid content and stable isotopes of carbon and nitrogen) from 19 zooplankton species collected over five consecutive winters (August and September 2012 – 2016) around the northern Antarctic Peninsula. To complement these data and provide context for interpretation, we report environmental data (percent sea-ice cover, sea-ice type, water temperature, salinity, and integrated chlorophyll-a (to 100 m)) as well as species abundance data at each sampling location. For most species, these are the first winter measurements or time series of body condition, trophic position, and abundance in relation to environmental variables around the northern Antarctic Peninsula. ... : The U.S. Antarctic Marine Living Resources (AMLR) Program conducted five winter surveys (August - September 2012 - 2016) around the northern Antarctic Peninsula and South Shetland Islands. A description of the survey area and environmental and zooplankton sampling methods can be found in Walsh et al. (2020). Briefly, we surveyed a grid of 110 historical fixed stations around the South Shetland, Elephant, and Joinville Islands. We conducted a Conductivity-Temperature-Depth (CTD) cast and an Isaacs-Kidd Midwater Trawl at each station. Upper mixed layer (UML) depth was defined according to Mitchell and Holm-Hansen (1991). UML temperature and salinities were defined to be means over the depth range of the UML. Water samples from CTD casts were processed for chlorophyll-a (integrated to 100 m, mg chl-a m-2) according to Holm-Hansen et al. (1965) and Holm-Hansen and Riemann (1978). We defined daylight conditions according to three categories. Day (D) was defined as one hour after local sunrise to one hour before ...