Satellite Tagged Dolphins

Mass strandings are extraordinary, catastrophic events. In Cape Cod Bay, they often involve large numbers of pelagic delphinids coming ashore within a short period of time, sometimes over a large geographic area.  Satellite telemetry now provides us the means to determine conclusively how well stranded dolphins can respond after beach release.

There were two separate mass strandings of Atlantic white-sided dolphins (Lagenorhynchus acutus) in February and April 2005. We were able to deploy satellite tags on two animals that were relocated and beach-released. The first of these animals was tracked for 33 days; the second for 118 days. Both tracks indicate survivorship and vigorous swim and dive behavior following return to offshore habitats.

Release Site
Putting on the
Satellite Tag

Post Release Locations
Dolphins rehabilitating on shore



Click on the images for a larger view


Concentration of Locations

Average Sea Surface Temperature for the Tag Duration


Dolphin 1
Dolphin 2 Dolphin 1
Dolphin 2

Average Chlorophyll-a Concetrations for the Tag Duration
Maximum Depth Recorded
per Day


Dolphin 1
Dolphin 2 2d Map
3d Representation