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Salinity Changes on the polychaete Nereis succinea I chose to experiment with the effects of salinity changes on the polychaete Nereis succinea Along with the other members of the group Patty and Jeremy I was curious to see whether the worms would engage in adaptive behavior when placed in a tank of water of foreign salinity or whether they would simply continue changing osmotically until they reached equilibrium with the environment The first step in our experiment was to simply observe the worms and get a feel for the ways in which they act We did this on Wednesday May 7 1997 from 930am to 1030am Also on this day we learned how to mix and measure salinity practiced weighing the worms and deciding our exact schedule as far as when we would come in and for how long etc From what I observed the polychaete is a salt-water worm that has adapted to live in estuaries We kept the control tank at 20 parts per thousand to 24 parts per thousand and the worms seemed very content and healthy at that level The worms on which we experimented ranged in size from approximately four inches to approximately six inches They weighed from 18 grams to 46 grams at the beginning of the experiment They have a pinkish almost salmon color to them and on two opposite sides they have these crimson hairs lined up in a row stretching the entire length of their bodies the hairs are less than an eighth of an inch long If we were to call the two lines of hair east and west then on the north and south sides there were dark lines that also stretched the entire length of their bodies These were their primary blood vessels and though we tried to locate the pulse that is supposed to conspicuously travel up and down this vessel we were not able to l ocate it
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