1. Welcome to Methods in experimental ecology PCB 6466

2. Instructors:
Lina Sánchez Clavijo,
Office: Biology Bldg. 409 Office hours:
Pedro F. Quintana-Ascencio, Office: Biology Bldg. 401 E
Office hours : by appointment
With the participation of:
Matthew Tye

3. First reading

4. Link to course web site Course Based on:
Course Based on:
Gotelli, N. J & A.M. Ellison A primer of ecological statistics. Sinauer.
Crawley, M.J Statistics: an introduction using R.
McCarthy, M Bayesian methods in ecology. Cambridge.

5. Performance Evaluation:
13 exercises. We only consider the 10 best (5 points each) = 5 x 10 =50
Two exams: content cumulative (15 points each) 15 x 2 = 30
Final (20 points)
Total = 100
Grade scale: A = ; B = 80-89; C = 70-79; D = 60-69; F= below 60

6. Etiquette for communication
Do not wait to the last minute. There will not be any response to questions within 24 hours before homework or exam due date.
We like our weekends, please no s on Saturday and Sundays. We will respond first come first served on Monday

7. Exercises
a single Word document with your results. All analytical work needs to be done in R (unless otherwise noted). Scripts and output from R should be included in the Word document for full credit.
They will be due a week from the day they are assigned. No assignments will be accepted after the start of the class on due date

8. Species correlates of Florifacies mirabila in playa linda
Pedro Quintana-Ascencio
Universidad de Cancun, Yucatan, Mexico

9. Florifacies mirabila Small mammal
Feed on insects. It has glandules around the mouth producing a sweet secretion that attract plant pollinators.
It is extremely sedentary
Endemic to the Yucatan peninsula

10. Thorny plant (Opuntia sp.)

11. Objective
To evaluate the association between Florifacies and Thorny plant (Opuntia sp.)
Hypothesis
Because both have flower like structures Florifacies and Thorny plant will be positively associated

12. Methods I established 59 1 x 2 m plots
I counted every individual of Florifacies and Thorny plant (Opuntia sp.) within the plot
Data was entered in Excel and analyzed with SPSS software

13. Nice Palms
Quadrats
Pedro
Florifacies mirabila
Thorny plant
Sampling design

14. Are Florifacies and Thorny associated ?
Total
Absent
Present
Thorny 46 4 50 5 9 59
Likelihood ratio = , d.f.= 1, Asymptotic significance (2 sided)=0.001
3 cells (75.0%) have expected count less than 5. The minimum expected count is .17

15. Do Florifacies density correlates with thorny plant density? How?
N=59 quadrats

16. Conclusions
Florifacies and Thorny plant (Opuntia sp.) are associated (P=0.001)
Their densities are are positively correlated (P<0.001)
My hypothesis was correct 

17. What is wrong? Do you agree with this conclusions?
Is the experimental design acceptable?
Is the analysis correct?

18. How can we access this door?
Experimental design and Data Analysis

19. What we need? ?