Samples were taken during expeditions PS103 by 20 µm mesh size plankton nets from ca. 15 to 0 m depth. To obtain clean siliceous diatom frustules, the samples were oxidized using hydrochloric acid and potassium permanganate and mounted on coverslips on standard microscopic slides in Naphrax resin. Classes ID:Asteromphalus.labId_6835 0Chaetoceros.labId_6813 1Fragilariopsis kerguelensis.labId_8356 2Fragilariopsis rhombica.labId_8362 3Nitzschia.labId_6758 4Pseudonitzschia.labId_8364 5Rhizosolenia.labId_6776 6Silicoflagellate.labId_10255 7Thalassiosira gracilis.labId_10366 8Thalassiosira lentiginosa.labId_10369 9