Does a Change in Temperature Affect the Rate of Movement in Woodlice

3666 Words Dec 19th, 2012 15 Pages
The affect of temperature on the rate of movement of woodlice

Aim: The aim of this experiment is to establish whether a change in temperature affects the rate in which woodlouse move. I measured the rate by timing the woodlouse to move a set distance of 20cm, and altered the surrounding temperature by submerging a clear tube in water with different temperatures controlled by a water bath.

Research: It is to be believed there over 3000 different species of woodlice, a total of 42 species have been recorded living in the United Kingdom, although not all of them are native (1). Woodlouse is a crustacean, which fit into the class of arthropods, crustaceans are primarily aquatic animals. It is for this reason that woodlice become
(cm) 25° 30° 35° 40° Woodlouse 1 7 9 13 18 Woodlouse 2 9 11 15 21 Woodlouse 3 6 8.5 16.5 21 Woodlouse 4 6.5 14 17 19 Woodlouse 5 7 11.5 15 19.5 Average 7.1 10.8 15.3 19.7

I found this method to be flawed as recording the amount of distance moved was inaccurate and difficult, as I could only record distance moved to the nearest half of a cm making the results less reliable. It became harder through the experiment as woodlouse movement increased as temperature increased and there angle of movement also deviated, making it more difficult to trace the movement. Although I will not use this method, it has proven to me that there is an obvious effect on movement of woodlouse with the increase of temperature.

Experiment 2: Effect of temperature on rate of movement of woodlouse using a straw as a run and candles as a heat source.

Method:
1. Set up two clamp stands 10 cm apart from each other.
2. Clamp straw into stands.
3. Place 3 candles below the straw all spaced an equal measurement apart from each other.
4. Record the temperature of the straw with a temperature probe wait until tubing has reached 20°c.
5. Place woodlouse into straw and start the stopwatch, stop the stopwatch when woodlouse has reached the end of the straw, the length of the woodlouse run should be 15cm and this should be clearly labelled.
6. Repeat experiment 3 times at the same temperature.
7. Repeat previous steps but alter the temperature by moving the