Thanks for the great questions! #sharkschat

Directly beneath the primary dorsal fin; sulphur gives you similar information to carbon, and adds an element for a mixing model #sharkschat

Indeed, the stable isotopes of nitrogen, carbon and sulphur. Cool stuff! #sharkschat

Thrilled to participate in Expedition GOM, my role was sampling muscle tissue to better understand what these majestic fish eat #sharkschat

Based on the recent assessment, blacktip sharks are doing OK (good news!) #sharkschat

Muscle samples give us the chance to use chemistry to study the trophic position of Gulf of Mexico sharks, information we need! #sharkschat

Hey #SharksChat, I'm Marcus Drymon from University of South Alabama and I use shark muscle tissue to study what they eat...