Microbial sources of intact polar diacylglycerolipids in the Western North Atlantic Ocean

► Microibal sources of intact polar diacylglycerolipids were identified. ► Photoautotrophs are sole source of sulfoquinovosyldiacylglycerol. ► Eukaryotic phytoplankton are likely source of a betaine lipid. ► Heterotrophic bacteria are sole source of phosphatidylglycerol.