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Continuous and discontinuous variation in ivy. Width and lenght (in centimeters) of 16 ivy leaves (Hedera sp.) were measured and raw presented in Table 1. The leaves were obtained at four different locations in Maribor, shown in the table.

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Introduction

Continuous and discontinuous variation in ivy Biology report No. 15 Name : Nebojsa Radisic Mentor: Bernarda Devetak School: Druga Gimnazija Maribor Date: 20. 05. 2008. Data collection and processing Width and lenght (in centimeters) of 16 ivy leaves (Hedera sp.) were measured and raw presented in Table 1. The leaves were obtained at four different locations in Maribor, shown in the table. A B C D L W L W L W L W 1 6,80 7,3 6,8 9 5,4 10,2 6,1 7,1 2 6,7 7,1 6,4 8,4 5 6 7,3 9,5 3 6,3 7,2 5,9 7,5 4,8 10 7,4 7,5 4 6,6 6,4 5,5 7,2 4,5 7 6,4 6,9 5 6,7 6,5 7,8 9,1 7,3 10,3 5,7 6 6 4,4 6 5,8 6,6 ...read more.

Middle

of ivy leaves at four different locations) Key for locations shown in the graph: A - Strazun B - Pobrezje A C - Tomsicev drvored D - Pobrezje B The raw data was later processed and presented in Graph 1, Graph 1 - Comparison of leaves' size representative samples from four different locations Conclusion and evaluation From the data obtained, we can conclude that the relative proportion between leaf width and lenght (the size of the leaf) is the highest in Tomsicev drvored and consecutively, in the area Pobrezje A, Pobrezje B, and at last, the area of Strazun contained the smallest sized leaves. The factors that most probably have influenced variations in leaf sizes amongst the same species at these four locations are different amounts of sun rays the plants have been exposed to (e.g. ...read more.

Conclusion

The variations between leaf sizes is a typical example of evolutionary adjustment and ''survival of the fittest'' theory, where organism, representatives of a single species living in different conditions eventually mutate so much in order to adjust that they strain away from the original specie's characteristics. As for future experiments of such kind, it would be wise to use also various plant species for measuring purposes, not just restrics oneself to one kind of sample. Furthermore, analysis of the leaf quality and some general characteristics and substances within the leaves (amount of water, minerals, etc) can also be easily done in order to give us a more thorough and complete picture of soil characteristics and different factors influencing (possible) variation in leaf sizes. ...read more.

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