Stickleback Lab

3141 WordsApr 15, 201313 Pages
------------------------------------------------- Ricky Vance ------------------------------------------------- Biology 120 Lab ------------------------------------------------- February 1, 2013 ------------------------------------------------- Ricky Vance ------------------------------------------------- Biology 120 Lab ------------------------------------------------- February 1, 2013 Phenotypic Variation of the Stickleback Phenotypic Variation of the Stickleback 2013 2013 Abstract: The purpose of the research was to formulate a question and develop a hypothesis based on the variations observed between two populations of threespine stickleback, in order to gain a better understanding of natural selection…show more content…
The compiled data was used to form population A of the experiment, while population B was predetermined and provided by the instructor. Research was conducted using primary sources and data collected in order to locate evidence supporting the hypotheses. Results: Table 1: Population 1 – Large Fish | | Number of Scutes | Spine Length (mm) | Standard Length (mm) | Spine Length/ Standard Length | Total | 90 | | | | Mean | 4.72 | 5.40 | 40.79 | 0.1335 | Standard Deviation | 0.654 | 0.958 | 3.76 | 0.024 | Standard Error | 0.069 | 0.101 | 0.397 | 0.003 | Population 2 – Small Fish | | Number of Scutes | Spine Length (mm) | Standard Length (mm) | Spine Length/ Standard Length | Total | 108 | | | | Mean | 4.56 | 3.41 | 28.49 | 0.119 | Standard Deviation | 0.930 | 0.986 | 3.92 | 0.027 | Standard Error | 0.089 | 0.095 | 0.377 | 0.003 | This table shows the calculated mean, standard deviation, and standard error in both populations. Figure 1: This chart shows the number of scutes found in each population. Figure 2: The graph indicates the ventral spine length in populations A and B. Figure 3: The graph shows the differences between standard lengths of population A and B. It is easy to see the difference in size between the populations. Table 2: Population 1 – Large Fish | Characteristics | Mean | Standard Error | Mean – 2(Standard Error) | Mean + 2(Standard Error) | Number of Scutes | 4.722 | 0.138 | 4.58

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