Our research explores how aquatic animals respond to changes in the environment (e.g. temperature) via changes in their physiology (e.g. lipid profiles) and ecology (e.g. feeding behavior). We are also interested in the ramifications of these organism-level responses for the structure and stability of food webs. We combine theory with field-based methods in Arctic seas, temperate lakes and tropical floodplains. These study systems all share drastic seasonal fluctuations in environmental characteristics.