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I chose to investigate the behaviour of woodlice in a wet or dry environment.

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Introduction

David Bennett 11DSM Coursework: Behaviour of Wood Lice When Offered a choice Between Wet and Dry In the experiment I was offered the choice to investigate the behaviour of woodlice in a wet or dry environment or a light or dark environment. I chose to investigate the behaviour of woodlice in a wet or dry environment. Woodlice belong to the biological class crustacea. Most of the animals in this class are aquatic, and though the terrestrial species can breathe with the aid of primitive 'lungs' they lack the features found in most other land-dwelling arthropods. They have no waterproof waxy cuticle on their exo-skeleton and are therefore more likely to suffer from dessication compared with other arthropods such as insects which have a well developed waxy layer. These animals excrete their nitrogenous waste as ammonia gas directly thorough their exo-skeleton (rather than as urea or uric acid).This means that their exo-skeleton needs to be permeable to ammonia and is therefore also permeable to water vapour. ...read more.

Middle

Diagram I will take down the results every minute for twenty minutes to put in a graph. I am doing it for twenty minutes because it will enable me to do a chi2 (? 2) at the end of the experiment. The chi2 test is a test that checks to see if your results are reliable and not just due to chance. For example you, you could flip five heads in a row on a coin but if you did it fifty times it would balance out. The chi2 test helps find occasions like this. Results Minutes Wet Dry 1 6 6 2 8 7 3 10 5 4 8 7 5 9 6 6 10 5 7 11 4 8 8 7 9 7 8 10 9 6 11 13 2 12 12 3 13 14 1 14 14 1 15 15 0 16 14 1 17 15 0 18 12 3 19 15 0 20 15 0 The results show that the wood lice preferred the wet environment to the dry, This may be easier to see in a graph. ...read more.

Conclusion

Woodlice prefer their environment to be wet. They prefer to live in a wet environment because they are permeable to water vapor they need to be in wet places to get their water supply. That is why they are found under big rocks and under logs in the wild; they are both damp places. Evaluation Overall; I think the experiment went very well. There weren't really any problems at all. I think the way we obtained our results worked very well. The results we got were very good as well there were no really strange results compared with the rest of them. I don't think I would change the way we got our results because there isn't really another way to do it. I think our results were very reliable as the chi´┐Ż test proved that they were not due to chance, they are definatly sufficient to support the conclusion I have made. The only problem we did have with the test was getting the woodlice in the choice chamber. In the end we just decided to open the lid throw them in and hope that none of them would escape; and they didn't. ...read more.

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