Comparison of endpoint respiration/retention (Resp/Ret) values for laboratory suspensions of Colwellia psychrerythraea 34H following shifts (down, no, up) in salinity at –1°C. Incubation salinities (ppt) are given above each bar; the no-shift salinity is the salinity of the starting suspension. A Resp/Ret ratio of 1 implies equal respiration and retention of choline; Resp/Ret > 1 indicates more choline respired than retained; and Resp/Ret < 1 indicates more choline retained than respired. Error bars indicate S.D. of the mean (n = 4); where no bar is visible, it falls within the dimensions of the symbol for the mean.