Discovery Metadata System

Datasets including Conductivity-Temperature-Depth, echo-soundings, swath bathymetry and fishing samples, from multiple marine cruises investigating krill abundance variability around South Georgia, Oct 2002-Jan 2006
GB/NERC/BAS/AEDC/00300

Summary

Abstract:
Various data including CDT (Conductivity-Temperature-Depth) profiles, echo-soundings, fishing samples and swath bathymetry were collected onboard ship, during multiple cruises in the Southern Ocean between Oct 2002 and Jan 2006. Sub-surface moorings were deployed with fishing undertaken around mooring positions to ground-truth the acoustic data being collected. Specifically, RMT (Rectangular Mid-water Trawl) hauls were carried out to learn more about the vertical distribution of plankton, krill, mysids and fish around these particular positions during the day and night time.

This work took place as part of a project to: a) quantify the magnitude and timing of short-term, ecologically-significant, intra-annual variability in krill abundance at South Georgia; b) describe the effect of oceanic tides at the two locations; c) test the hypothesis that krill immigration to, and hence abundance at, South Georgia is mediated by influx of cold waters; and d) determine functional responses of predators to short term variations in prey (krill) abundance. Antarctic krill (Euphausia superba) is of vital importance to the South Georgia marine ecosystem providing food for a high proportion of Antarctic wildlife, and is eaten by most animals (seals, whales, birds, fish, squid, penguins).

This is a parent dataset listing - for individual datasets see:
GB/NERC/BAS/PDC/00781 (CTD)
GB/NERC/BAS/PDC/00782 (fishing samples)
GB/NERC/BAS/PDC/00783 (echo-sounding)
GB/NERC/BAS/PDC/00784 (swath bathymetry)

Keywords:
Euphausia superba, krill abundance, krill immigration, physical sensor

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