Tide and Periwinkle Snail

Topics: Tide, Intertidal zone, Littorina Pages: 2 (586 words) Published: December 2, 2010
The periwinkle snail is in the family Littorinidae and is known as a shore snail. These tiny snails are approximately 1-½ inches long and are found among rocks, on wood pilings between high and low tides, underneath docks, and in mud pools. The largest periwinkle snail, Littorina littorea, is the most common variety. The periwinkle snail originated in Europe and was brought to Canada in the mid-1800s. It can be found all along the East Coast of the United States, from New England to Maryland. Many different types of shore and water birds feed on this snail as part of their diets. In some locations, such as the southern United States, all freshwater snails are also known as periwinkles

The Natural Fringing Marsh
The natural fringing marsh was an open habitat where all of the groups studied to check for an accurate distribution of periwinkle snails (Littorina irroratata) the natural fringing marsh. At the marsh we checked for accurate count of the amount of snails that were in a particular area and the amount of stems that were present. Overall for this part of the experiment the groups were testing to see if there was a correlation between the numbers of snails and the numbers of stems. We plotted these numbers on an excel graph to try and find a correlation, and while some groups had a correlation also a lot of other groups didn’t have a correlation between the numbers of stems as compared to the number snails.

Overall however, a trending pattern in the excel graphs were that the more stems a location or site had the more snails were present; it was also observed that some of the periwinkle snails could be found on the exceptionally long stems that were present at the marsh. One possible explanation on why Periwinkle Snails were more prevalent in the areas where there were a lot of stems is that the stems is where the Periwinkles food source is at Periwinkle snails eat the detritus (little bits of plants and dead animals) and algae left on...
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