Title: Palmer LTER: Impact of a large diatom bloom on macronutrient distribution in Arthur Harbor during austral summer 1991-1992. Authors: Mark A. Moline and Barbara B.B Prezelin Palmer LTER Contribution No. 41 ANTJ, 1994 Review, Vol. 29, No. 5, 217-219 A set of stations, within 3.2 kilometers of Palmer Station, was established as part of the Palmer Long-Term Ecological Research (LTER) program to discern patterns and time/space scales of trophic variability within the foraging range of the local bird populations (Waters and Smith 1992). Here, we present observations from station B (z=70 meters), located off Bonaparte Point within Arthur Harbor, which was intensely sampled from 21 November 1991 to 27 February 1992. The subset of Palmer 1991-1992 data from station B illustrates the timing and magnitude of formation and dissipation of a large summer diatom bloom and the significant impact that bloom had on inorganic nutrient availability within the water column.