The foraging ecology of an oceanic squid, Todarodes filippovae: The use of signature lipid profiling to monitor ecosystem change

► New dietary information on a large, abundant oceanic squid. ► Myctophid fish dominate the diet in most Southern Oceanic pelagic squid. ► Squid digestive gland lipid content correlates with local productivity. ► Spatial and short-term temporal dietary trends detected. ► Squid lipid parameters can monitor complex ecosystem dynamics and change.