Phytoplankton communities in the Ross Sea, Antarctica, are characterized by the haptophyte Phaeocystis antarctica Karsten, which dominates deep mixed layers, and diatoms, including Fragilariopsis cylindrus Grunow, that thrive in shallower mixed layers. To investigate whether differences in photoprotective strategies explain these distributions, photosynthetic parameters, pigments, and fluorescence properties were measured in c...

Concentrations of virus‐like particles (VLP), prokaryote‐like particles (PLP), chlorophyll a, and zeaxanthin were determined at 9–12 depths (0–250 m) for each of 13 stations along a 3,800‐km transect from the coastal waters of Monterey Bay, California (36.62°N, 122.25°W) to the open ocean Hawaii Ocean Time‐Series (HOTS) station near Hawaii (22.69°N, 158.12°W). We collected VLP and PLP, the latter of which included heterotrophi...