This simultaneous testing and comparison will either prove or disprove the hypothesis that small bird’s physical characteristics can greatly impact their population growth. The base line for this comparison will be two islands labeled island A and B with population AY of finches on island A and a population of Bal finches on island B. There will be two time allotments used to factor in the population growth for each sets of populations on both islands: beginning with a 100 year scenario and then followed by a 200 year scenario.
Using extended timeliness will reflect accuracy in the initial 100 year reading and or show that physical characteristics of finch birds only impacts population growth for a specific time period. Each island A and B will be of the same size and offer the same vegetation amount and size. However, the physical characteristics of each population will be altered to population AY with a beak length of 14 mm and population Bal with a beak length of 11 mm. Given the consistency and amount of controls, compared to the one and only variable being a major physical characteristic of the finch.
I believe that the finch of population AY with the longer beak will show a greater population growth for a longer period of time as compared to that of population Bal with the smaller beak to start the experiment. Materials Materials used for this experiment are a computer, paper and writing instrument, and access to both the student website and Evolution Lab. Methods and Procedures Using the Evolution Lab provided by the student website we will open the lab interface where two sections of separate finch bird populations can be observed, altered and tested.
The population of birds on the Darwin Island is going to be labeled as population AY with respect to the Darwin Island being labeled as island A. The opposing island will be named island B and its population as Bal. Each islands inputs and or parameters will be documented ND assessed to ensure they are both identical in size and vegetation sources. Island A Population AY 1 Island B Population Bal I Beak size 14 mm I Beak size 1 MIM I Variance 1. 00 | Variance 1. 00 | Heritability 0. 70 | Heritability 0. 70 | Clutch size 10 eggs I Clutch size 10 eggs I Island size Island size 1. Km I 20. CM Precipitation 20. CM I Precipitation Each of these inputs is exactly the same except for the one physical characteristic of the finch: the beak. Each scenario will be run at the same time and show comparisons as to population growth and changes. The first run will e set at 1 00 years to revisit the information which is selected in the main menu prior to running the experiment. Not only is the information regarding each population’s beak size over time important but the population growth is what is needed for the hypothesis.
After the first run is completed the inputs will be changed to reflect a 200 year period where population Bal with the initial smaller beak will have a greater time line in which to match the first population or exceed its growth. Data Each experiment yielded different results; however, they reflected much of he same outcome: one population showing far greater population growth and sustained through the first 100 years. Below is a chart which depicts the population growth of the finch birds for population AY (labeled in red) and population Bal (labeled in blue).
Chart retrieved from Evolution Lab (2012). As seen in the graph above the finch with the larger beak in the initial experiment did in fact show a greater rate of population growth with far less pit falls, thus showing greater population sustained through the first 100 years. However, island B did show that there might be a chance in the longer period of time for he population Bal to catch up to the first population thus showing larger beaks do not improve population growth but accelerate it within a shorter time line.
To see how this plays out we must see the results from experiment two. The graph below reflects the results and population growth of the finch birds from both islands with the same inputs but over a 200 year period instead of 100 years as in experiment mummer 1. Two hundred years of sustained growth by both populations as shown in the graph above will prove that initial larger beak size of a finch population vie the same parameters to live in will only reflect greater population growth at an accelerated rate for a specific time period give the parameters of the experiment.
Furthermore, in this test, the population Bal actually surpassed the population AY at more than one point, thus showing that my hypothesis is disproved for any time period past 150 years. The larger beak will in fact not give anyone population greater population growth for infinite time but for regulated periods of time the bird population will grow at a faster rate. This information is based upon the fact that the island could only withstand a specific amount f birds, thus the population growth can not be proven nor disproved based on the information provided.
The resources and providential factors in this experiment did limit the experiment at the point each island reached its population capacity before placing too much stress on the echo system. If birds were to have started at a lower population and with less precipitation which would reflect a different and various food source, perhaps the population growth would have taken longer and reflected more accurate results in the second experiment for 200 years.