Echo-sounding data collected onboard ship during multiple cruises in the Southern Ocean between Oct 2002 and Jan 2006.
This dataset contains data from a study of pteropod shell dissolution on individuals exposed to CO2-enriched seawater. The data include the amount of dissolution as well as the physical and chemical parameters on which carbonate chemistry parameters were calculated.
Biological tissue samples from octopus species collected from the Southern Ocean, James Clark Ross cruise no. JR147/145. A large collection of tissue samples from deep sea and Antarctic target groups had already been collected in previous cruises. The specific objective of this cruise was to target three species of octopus, Pareledone charcoti (peak abundance 100m depth), Pareledone turqueti (peak abundance 100-200m) and Adelieledone polymorpha (peak abundance 250-350m), for the micro-evolution (i.e. population genetics) component of the project. Most of the octopuses were captured with an otter trawl, due to its relatively large sampling area and the fact that it can be trawled quickly (4 knots) which prevents octopuses from swimming out of it.
Life history and phylogenetic/geographic data were combined with oceanographic data to test models of population structuring by oceanographic processes. The data are solely model outputs; specifically high-resolution flows for the South Georgia region and fish egg and larval distributions from different spawning sites.
DNA sequencing data from octopus samples collected in the Southern Ocean. A small tissue sample was taken from the mantle of each octopus and placed immediately in 70 - 80 % ethanol for preservation, in preparation for DNA extraction.
Samples of Antarctic krill, Euphausia superba, were collected during the Discovery 2010 cruise aboard the James Clark Ross (JR177). Krill from two areas were used, one from around 60 South from the vicinity of the South Orkney Islands, and the second from north-west of South Georgia at around 52 South. All of the krill were taken by target fishing.
Data related to Antarctic krill activity monitoring studies conducted in the Southern Ocean and South Atlantic during the Discovery 2010 cruise (JR177), 2007-2008. The activity monitor is a purpose-built apparatus for the observation of vertical migration patterns. Lighting within the apparatus is adjusted to that experienced by the krill at normal daytime depths and the temperature in the cool-room kept at the level of the seawater supply. The movements of the krill over a 10-day period were recorded - 5 days recording their vertical migration patterns under normal lighting conditions followed by 5 days in total darkness to see whether the activity pattern is maintained, indicating control by an endogenous circadian rhythm. Three runs were carried out, using animals from 60.44 S, 59.66 S and 52.75 S. Behaviour in many organisms (including krill) is strongly influenced by diurnal and seasonal changes in the environment. The evolution of circadian clocks has afforded organisms regulation of molecular and physiological rhythms, which in turn affect the animals'' rhythmic behaviour.
Biological fishing samples were collected during multiple cruises in the Southern Ocean between Oct 2002 and Jan 2006. Fishing was undertaken in the area of sub-surface moorings to ground-truth 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.
Morphometric data from octopus species collected in the Southern Ocean. Every octopus was fixed in 5-6% formalin for 4 days, before being heat sealed in a plastic bag containing 4% formalin, and packed for morphometric studies.
Samples of seawater were collected from the upper watercolumn at the RaTS site and examined to assess bromocarbon production by different microalgal species and how this production varies with changing environmental conditions. The field report (see reference) supplies dates on which the samples were collected and the incubations were started, and the depths incubated.