Movements of tiger sharks (Galeocerdo cuvier) - contrary to ordinary


Thursday, July 26, 2012
Redfield Auditorium - 12:00 Noon
Dr. Brad Wetherbee
Department of Biological Sciences
University of Rhode Island

Tiger sharks are a large, wide-ranging species with movement patterns that are particularly challenging to assess.  We have tagged 58 tiger sharks with SPOT (Smart Position or Temperature Transmitting Tag) tags and 16 tiger sharks with popup archival satellite tags at a variety of locations in the Western North Atlantic, Caribbean and Western Australia.  We have followed movements of 20 sharks for at least one year, including one individual for nearly three years.  Movements of tiger sharks are variable among individuals, even those tagged at the same time and location.  Some sharks exhibit repeated and fairly consistent seasonal migrations and occupation of the same general area at the same time of year over consecutive years.  Tiger sharks demonstrate the ability to use a variety of diverse marine environments for long periods of times and alter the size of areas searched depending on energy density.  The extensive and enigmatic nature of tiger shark movements in the Western North Atlantic presents challenges for both documentation of those movements and for effective management of tiger shark populations.