ecology final lab report

# The collected stems were then dehydrated for about

This preview shows pages 4–7. Sign up to view the full content.

possessed a gall or a flower before it was stored within a paper bag. The collected stems were then dehydrated for about twenty four hours at 95 degrees Celsius. The weight of the flower and the stem was then measured, followed by a calculation of the percent total weight of the respective stem and flower.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
O’Connor A paired t-test calculation was then performed on the collected data for the weight of the stem and leaves, the weight of the flower, and the height of the non-galled and galled individuals. This t-test was performed in excel and utilized the following function. T-Test= (array1, array2, tails, type) The critical value or t-value was then calculated for the weight of the stem and leaves, the weight of the flower, and the height of the non-galled and galled individuals. This statistical analysis was also done through excel and utilized the below equation function. T-inv=(probability, degrees of freedom) Standard error was also calculated for each data point. This was accomplished by dividing the standard deviation for each respective data category by the degrees of freedom, which in this experiment was thirty-four. Results: When comparing the average height for galled and non-galled Solidago canadensis one can notice a significant difference as seen in figure 1. This was then solidified with the calculated p-value for this trait, which was 7.95×10 -6 . For one the average height for an individual who possessed a gall was 12.29 cm shorter than individuals who did not possess galls. There was also a noticeable and calculated significant difference between galled and non-galled individuals when it came to the characteristic of the weight of the flower. The p-value was that of 4.72×10 -7 . This significance then carried over to the percent weight of the flower as evident by figure 5 where a clear difference between the two graphed individual types can be witnessed. On average an individual that contained a gall had flowers that weighed 0.707 grams less than a plant counterpart that did not possess a gall. However, the weight of the stem and leaves between galled and non-galled individuals was not found to be significant with it possessing a p-value of
O’Connor 0.338. This is then further supported within figure 2. This is once again translated in the percent weight of the stem and leaves of galled and non-galled individuals and can be examined further within figure 3. Discussion: My hypothesis and main ecological question for this experiment was whether or not galling by the larvae of Eurosta solidaginis reduces the performance of Solidago canadensis through their impact on the plant’s size and weight. It was shown that galling insect larvae of Eurosta solidaginis do in fact impact the performance of the Solidago canadensis. The above outlined results depicted the difference in height to be significant when comparing the two different types of individuals as stated before. Thus, leading to a decrease in performance for shorter galled individual plants due to the association between fitness and size within a plant population (Weiner 1986). In plant species, the individuals who acquire more resources get big

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern