Do dugongs trade food for safety? Can alteration of dugong behavior be

quantified? How?

Measuring food density

Measuring dugong density

Measuring risk

What is the role of tiger sharks as predators?

Scavenging vs. active predation Are tiger sharks the only (or main)

predator? Few dugongs are known to be eaten –

so why would one hypothesize evolution of predator avoidance?

Shark abundance

Dugong total abundance

Dugong foraging & shark density

Solid circles = deep, open circles = shallow for dugongs

Which model best predicted density?