After processing the video footage from our first week of stationary camera deployments, we noticed we were not alone. Most people just recognize her as a shark, but that’s an understatement. She’s a tiger shark. Locals have taken to calling her Tony the Tiger. National Park Service biologists and technicians have yet to encounter one in their many years of diving around Buck Island so my team and I are confident we won’t be crossing paths with Tony while scuba diving.
NPS has been working with multiple collaborators to study the movements of sharks within the monument using acoustic telemetry. Given these recent sightings of Tony in our video footage, NPS biologists are eager to see if they can cross reference these sightings with detections from acoustic receivers installed near our camera monitoring site. We hope to find that Tony is one of the individuals that was tagged in previous years.
Tiger sharks are natural predators to sea turtles. Their serrated teeth allow them to tear through the turtle’s carapace (shell). Even though Tony has been feeding on our study subjects, we’re happy that she’s here. The presence of apex predators is one of the signs of a healthy ecosystem. Believe it or not, they play an important role in structuring seagrass ecosystems. They balance the food web as well as prevent lower levels from exhausting resources.
Healthy seagrass ecosystem = Abundant greens turtles = Tiger sharks
It’s important to understand the significance of top-down control in natural ecosystems in order to better establish conservation and management baselines that could predict ecosystem responses to natural and anthropogenic change.