|Table 1. Depth zones of the pelagic habitat, with total volume in the world oceans in millions of cubic km [Vol (106 km3)] and percent volume (% Vol) of the total. Note that most of the ocean volume is considered bathypelagic (from Hedgepeth, 1957).|
For our project, our particular interest is in investigating earlier reports of very deep populations (below 2,000 m) of our target salp species in the deep waters of the Western Antarctic Peninsula region. We wonder whether there are unsampled deep-living populations of this species, or whether perhaps the species migrates between the surface and such great depths. Our molecular genetic and genomic analyses are designed to help answer this question.
For our salp survey, we are sampling from surface to as the near the bottom as possible. For stations deeper than 1,000 m, we sample to 1,000m, except for stations deeper than 2,500 m, when we sample to that depth. We are sampling zooplankton with a complicated instrumented net system, called a MOCNESS (Multiple Opening-Closing Net and Environmental Sensing System; Fig. 1) that provides data in “real time” (immediately) through a conducting cable to a ship-board computer.
|Figure 1. The MOCNESS is launched from the LM GOULD. You can see the electronic instrumentation in pressure cases at the top and cod ends (PVC buckets) at the end of the nine nets. Photo Peter H. Wiebe|
|Figure 2. The red line shows wind speeds over the previous 24 hr at 12:00 Noon GMT or 9:00 am local time on Nov. 13th.|
Figure 3. MOCNESS data acquisition screen, showing net trajectory (with different nets in different colors), environmental parameters, and position during a 2,500 m tow.
-- Ann Bucklin (University of Connecticut) and Peter Wiebe (Woods Hole Oceanographic Institution)