C-Fern Formal Lab Report

C-Fern Formal Lab Report - Examining the Effect of...

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Examining the Effect of Population Density on Individual Growth Biology 2101 April 19, 2006 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1
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Introduction There are several factors that may affect a given organism throughout its development. Some events can be the cause for an organism to thrive and flourish, while at the same time it may restrict or even kill it. Having similar age and genetic make up does not mean that two separate individuals will be similar in size and health. What events could have such an impact to alter two exact same individuals that may be only a short distance away from each other? One of the many factors that may have a dramatic effect on a species is not only the location of the species but how many individuals are actually occupying the area of living. This leads us to the basis of our experiment. Our hypothesis is that the density of a population will influence the growth of individuals in that population. To test our hypothesis we will be using a model plant that is a strain of fern derived from the genus Ceratopteris and species Richardii, it is known as Ceratopteris Richardii (C-Fern). It is found most in tropical and subtropical areas of the world in the aquatic or sub aquatic habitats such as ponds and rivers. The C-Fern is widely used for education purposes due to it is readily available, inexpensive, and is easy to grow with short life cycles. By using the C-Fern to test our hypothesis, we predict that the sporophyte cultures with higher population density will have smaller overall leaf lengths. Methods The independent variables in this experiment are the sporophyte densities of each culture that is created. There were four cases of the independent variable. We created cultures with four different densities of spores and three dishes in 2 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 2
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each different density for a total of 12 cultures. The dependent variables are the actual leaf lengths of the C-Ferns that grow in each density culture group. We used all genetically identical spores and grew them in the same size Petri dish
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C-Fern Formal Lab Report - Examining the Effect of...

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