Never before has any research group attempted to observe seal movements for a 24 hour period. SAMPLA broke that barrier with a 24 hour survey of seal movements around
Under a clear sky and a full moon, seals were located by the sound of their splash or the bioluminescence they set off as they swam through the water. Night vision goggles were used to determine the number of incoming or outgoing seals once a group was seen or heard. Occasionally, we tossed the omni-directional hydrophone into the water to determine if any of our tagged sharks were in the area. Pasella, the most recent shark we tagged, stayed in the area for most of the night. On several occasions the VR100 indicated that she was within
The sunset was stunning across the horizon as seals gathered around the launch pad. As if on cue, at 6pm when the last glimmer of the sun could be seen, groups of seals began shooting off to their feeding grounds. In first hour after sundown, over 200 seals were counted leaving the island. The next shift was quite anti-climatic, with only a handful of seals leaving in much smaller groups. At this time the full moon was rising and the seals were outlined in cobalt blue bioluminescence. On the third shift, SAMPLA team continued to see a few small groups leaving the island. This data is of utmost importance to SAMPLA’s research as all previous seal surveys have concluded at sundown. Being on the water at sundown and throughout the night gave a new perspective to seal behaviour.
As the night went on, the temperature dropped and everyone looked forward to their turn in the cabin to sleep and warm up. As the sun rose around 7 am (we were not sure if it ever would) the SAMPLA team had made history and collected groundbreaking research on seal movements at night.