| Author Title Journal |
Seravin (1959) Izmenenie rezistentnosti morskoi turbell-yarii (Convoluta borealis Sabuss) v usloviyakh opresneniy. [Changes in the resistance of sea turbellaria (Convoluta borealis Sabuss) in desalination conditions.] Nauchn Dokl Vysshei Shkoly Biol Nauki 2:50-52. [Zhur. Biol., 1960, No. 60661] |
Abstract / Notes
A study was made of the correlation between the survival rate of Convoluta borealis and the salinity of sea water (from 0% to 30% of the salinity of normal sea water), the time in which the worms die is almost directly proportional to the decrease in salinity. In sea water of 30 - 50% salinity, the survival rate increases and ceases to be proportional to the changes in salinity. When sea water is diluted by more than half, no worms die. The endurance of the worms in 20% sea water was also studied in connection with the time they were in water which was 60, 40, and 30% of the normal salinity. Worms kept in normal sea water, and which perished in 20% water, in 13.2 [plus or minus] 0.3 minutes, served as the control. When worms taken from 60% water are placed in 20% water, their endurance increases 5-7 times over a period of 6 hours; after that it decreases evenly and becomes established at a level 2.5-3 times higher than that of the control. In 40% sea water the resistance rises temporarily 10-12-fold, alter which it shows a rapid decrease, and on the 2nd day the worms die en masse. In 30% sea water death occurs after 41.3 [plus or minus] 1.6 minutes; in the latter conditions there is no temporary increase in endurance.| Home page -- (Main hierarchy) |