Welcome to Methods in experimental ecology PCB 6466

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Welcome to Methods in experimental ecology PCB
6466
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• Instructors
• Lina Sánchez Clavijo,
• Office Biology Bldg. 409 lina.sanchez_at_knights.u
  cf.eduOffice hours
• Pedro F. Quintana-Ascencio, Office Biology
  Bldg. 401 Epedro.quintana-ascencio_at_ucf.edu
• Office hours by appointment
• With the participation of
• Matthew Tye

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First reading
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Link to course web site

• http//pascencio.cos.ucf.edu/
• Course Based on
• Gotelli, N. J A.M. Ellison. 2004. A primer of
  ecological statistics. Sinauer.
• Crawley, M.J. 2005. Statistics an introduction
  using R.
• McCarthy, M. 2007. Bayesian methods in ecology.
  Cambridge.

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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 50 30
20 100 Grade scale A 90-100 B 80-89 C
70-79 D 60-69 F below 60
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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 e-mails on
  Saturday and Sundays. We will respond first come
  first served on Monday

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Exercises

• E-mail 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

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Species correlates of Florifacies mirabila in
playa linda
Pedro Quintana-Ascencio
Universidad de Cancun, Yucatan, Mexico
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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
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Thorny plant (Opuntia sp.)
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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

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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

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Nice Palms
Quadrats
Pedro
Florifacies mirabila Thorny plant
Sampling design
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Are Florifacies and Thorny associated ?
Florifacies Florifacies Total
Absent Present
Thorny Absent 46 4 50
Present 4 5 9
Total 50 9 59
Likelihood ratio 10.155, 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
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Do Florifacies density correlates with thorny
plant density? How?
Florifacies density
N59 quadrats
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Conclusions

• Florifacies and Thorny plant (Opuntia sp.) are
  associated (P0.001)
• Their densities are are positively correlated
  (Plt0.001)
• My hypothesis was correct ?

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What is wrong?

• Do you agree with this conclusions?
• Is the experimental design acceptable?
• Is the analysis correct?

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How can we access this door?
Experimental design and Data Analysis
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What we need?
?