. The Biological bulletin. Biology; Zoology; Marine biology. NEREIS SUCCINEA IN HIGH SALINITIES 155 Nereis succinea Average ST5n Salton Sea water • T = 21 - 23 C O T = - 34 C "Instant Ocean" O T=21-23C. Medium: "ooisalmity Figure 1. Survival time of Nereis succinea in increasing concentrations of Salton Sea water, expressed as average ,.. Points are averages of all trays ("initially 10 worms each) in each salinity, with the standard error indicated. Arrows indicate the Critical Salinity (CSso) where survival is reduced to 50% of that in 36'r, Salton Sea water. increment
. The Biological bulletin. Biology; Zoology; Marine biology. NEREIS SUCCINEA IN HIGH SALINITIES 155 Nereis succinea Average ST5n Salton Sea water • T = 21 - 23 C O T = - 34 C "Instant Ocean" O T=21-23C. Medium: "ooisalmity Figure 1. Survival time of Nereis succinea in increasing concentrations of Salton Sea water, expressed as average ,.. Points are averages of all trays ("initially 10 worms each) in each salinity, with the standard error indicated. Arrows indicate the Critical Salinity (CSso) where survival is reduced to 50% of that in 36'r, Salton Sea water. increments of 10%« until the final test salinity was reached. Calculation of the time for 50% survival (STBo) of a test group of worms (usually four trays with 10 worms each) began with the day the worms first were placed in the final test salinity. Graphs of ST-)0 as a function of the final salinity were used to determine the Critical Salinity (CS5o), the salinity where survival is reduced to 50% of the survival in 36f<< Salton Sea water. This calculation of CSSn is possibly biased in those experiments involving graduated salinity increases, since it ignores the mortality of worms in lower salinities during the adaptation period. However, otherwise comparable experiments in which worms were transferred directly to the final salinities gave similar results. Results of both types of experiments are combined for the following analyses. Results for all experiments on survival of atokes are summarized in Figures 1 and 2. These are averages and calculations based on over 280 worms in 36%e, over 140 worms in each salinity between 45 and 60c/<c. and between 50 and 100 worms in all higher salinities. Figure 1 shows the average survival time (ST50) for all worms in all salinities, with the standard error indicated. Survival was high at salinities of 50%< and lower, but declined in higher salinities. The critical salinity CS30 is estimated to be slightly lower than 65%o. Figure 1 a
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