ReefQuest Marine Projects ReefQuest Marine Projects Contact Us
ReefQuest Marine Projects ReefQuest Marine Projects About Us For Teachers
ReefQuest Marine Projects ReefQuest Marine Projects Newsletter Links
ReefQuest Marine Projects ReefQuest Marine Projects Products For Students
ReefQuest Marine Projects
Expeditions

2002 Expedition Report

Between 15 July and 10 August, our research Team consisted of the following fine people:

  • Melissa Carp, of the New York Aquarium, NY

  • Paige Colwell, an EMS Technician and Firefighter from GA

  • Kirstin Grish, manager of a VA-based stock photo agency

  • Gennadyi Gurman, marine biology student at SUNY, NY

  • Neil Hammerschlag, marine ecology student at Nova Southeastern University, FL

  • Kathryn Hodgson, ecology student at St. Andrews University, Scotland

  • Daniel Muir, errant marine biologist and surfer from CA

 

We logged 15 days on the water, during which we:

  • Recorded 150 data points of environmental data

  • Scored and categorized 124 bait approaches by White Sharks

  • Documented and catalogued data on 91 natural predatory interactions between Cape Fur Seals and White Sharks

  • Observed at least 96 individual White Sharks, of which 89 were catalogued

  • Observed 75 breaches by White Sharks

  • Scored 31 social interactions between pairs of White Sharks

  • Documented 19 cases of natural mortality in Puffadder Shysharks

  • Documented 6 strikes by White Sharks on seal-shaped decoys

  • Documented 5 aborted predatory strikes on seabirds

  • Observed 3 species of whale, the rare Sub-Antarctic Fur Seal, and 9 species of seabirds

These data bring the total number of individual White Sharks catalogued to 122 individuals, including numerous resightings over separate days.  Our data are beginning to show that White Sharks at Seal Island exhibit low residence times (typically, 1-3 days), strong site fidelity (going back at least 7 years), and numerous identifiable individuals appear to come and go together in stable groups of 2-6.

Further, these data bring the total number of documented predator-prey interactions between White Sharks and Cape Fur Seals to 201, of which about 35% resulted in successful kills.  Recognizable individual White Sharks display distinct predatory strategies and some enjoy a predatory success rate of roughly 80%.

Perhaps most intriguingly, individual White Sharks display distinct 'personalities', such that their behavior toward baits, decoys, the boat, the cage (with or without divers inside), and each other is readily predictable to a high degree of accuracy.  The overall rate of agonistic (threatening) interactions among them is very low, suggesting dominance hierarchies in which social rank is established and stable over time.

 

Cumulatively, the data from Seal Island now affords sufficient data for at least 16 scientific papers for peer-reviewed journals and have created opportunities for two of this year's Expedition participants to extend aspects of this on-going study (under the aegis of the ReefQuest Shark Research Program) toward their graduate degrees.

Overall, it was a spectacularly successful field season.  Who knows what we will discover next year?

[ TOP ]

All text & images are copyright. Please contact ReefQuest for usage privaleges. Thanks.
 ReefQuest Marine Projects
Devi Multimedia ReefQuest Marine Projects ReefQuest.com