Slaters And Salinity Term paper

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Abstract

I conducted an investigation on the Slaters salinity preference. This involved in testing slaters on different salt solutions. I did this by having a base solution, which I diluted by different amounts of plain water to make different percentages. I started with a 2.2% solution, which is equivalent to seawater. This showed little results and this is because Woodlouse are actually crustaceans which means they can withstand salt water. I then changed the solution to a 6.6% salt solution. This produced more results than the previous trials and gave me a clearer picture from the graph and a clearer treadline.

Introduction

Woodlice belong to the class of arthropods known as crustaceans, which is a predominantly aquatic group containing the crabs and lobsters. Although they now live on land the woodlice have not completely shaken off their aquatic habits. Their skins are not completely waterproof, and the animals very soon desiccate in a dry environment. This is why almost all of them are confined to damp places and why they only come out to feed at night, when the air is cooler and damper. Many of the species can breathe only if their bodies are covered with a thin film of moisture, although they would soon drown if immersed in water.

Woodlice have a certain preference where their ecological niche is concerned. They prefer dark, damp places and can often be found underneath bits of wood. As a control, to make sure my experiment produces fair and unbiased results I will cover the tests to make sure that the area the Slater’s are in is dark. Slater’s like damp conditions as they lack a waterproof cuticle or outer layer so water is easily able to diffuse through their exoskeleton. For this reason I am focusing my investigation on slaters preference of salinity.

My aim is to investigate and determine what the optimum salinity Slater’s prefer given a wide range of percentages.

I suspect that the slaters will not like the higher percentage salt solutions as the salt in the water causes them to dry out and causing them to desiccate (the water will diffuse out of their exoskeleton). I suspect that the will prefer the lower salt solutions. E.g. 40% and below

Method

Equipment

− Salt solution (originally 2.2% but later changed to 6.6%)

− Water

− Droppers x7

− Measuring Cylinders x4

− 100ml Beakers x2

− Medium Plastic Dishes

− Large Plastic Dishes

− Timer

− Slaters (10 per medium sized dish)

− Filter paper

Instructions

1. Draw a circle the same size as the medium dish on the filter paper. Cut out the circle then cut it into 6 even triangles. Number the triangles 0%, 20%, 40%, 60%, 80% and 100% and spread them out in the medium sized dish.

2. Measure out each solution by firstly naming each measuring cylinder a different percentage - 20%, 40%, 60% and 80%. In the beakers pour normal tap water into one and the salt solution into the other.

3. For each percentage pour in the required amount of salt water solution and the required amount of tap water.

E.g. For 20% measure out 20mls of salt solution and 80mls of tap water

For 40% measure out 40mls of salt solution and 60mls of tap water

For 60% measure out 60mls of salt solution and 40mls of tap water

For 80% measure out 80mls of salt solution and 20mls of tap water

For 0% use tap water and for 100% use the salt solution on it’s own

4. Using a dropper squirt the corresponding solution onto the corresponding triangle.

5. Put 10 slaters from the glass container into the medium dish and cover with a large dish. This means that we can control the amount of light the slaters are getting.

6. Start the timer and leave for 30 minutes. This is how I controlled the exact amount of time each trial was set for so that I can make sure I have fair tests

7. After 30 minutes has passed take off the large plastic dish cover and count how many slaters are on each triangle

8. Record results in a table and repeat at least 15 times for accurate results

Conclusion

In conclusion the investigations that I produced were somewhat inconclusive. The data I collected which is shown in the graph identifies a trend, which shows that the slaters optimum salinity of the 6.6% solution is 40%. Starting out from 0% the average amount of slaters increase until 40% and then decreases going into 60% and 80%. However in the 100% is the highest average of all, which changes and varies our results.

Discussion/ Evaluation

Slater’s do not have a waterproof cuticle. This allows water to easily diffuse through their outer layer. A higher percentage of salt will dry out the slaters outer layer faster. At the...

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