Zooplankton samples, light levels and water temperature from 0 to 200 m in McMurdo Sound to determine diurnal vertical migration of plankton during the summer months

In polar regions, light is continuous during the summer months. This study investigated whether diurnal vertical migrations were performed by some of the dominant members of the zooplankton of McMurdo Sound during the summer.

Sampling was carried out at the edge of the permanent ice in McMurdo Sound. Sampling began at 11:30 am with drops of a 1mm mesh, free fall net from the surface ot the depths of 190, 160, 130, 100, 70, 40 and 10m. Light intensity was taken at each depth and recorded along with the simultaneous surface light intensity.