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Desert plant associations. Announcements . *we will leave in 1h from the start of the lab (22) and in 15 minutes (24) *the assignment for this lab is a report -same format (I expect to see typed tables, graphs,..) -points distribution in the last slide -no revision

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announcements
Announcements

*we will leave in 1h from the start of the lab (22)

and in 15 minutes (24)

*the assignment for this lab is a report

-same format (I expect to see typed tables, graphs,..)

-points distribution in the last slide

-no revision

* Matthew Lopez will present next lab. period.

*there is a handout of the final project example titles.

-prospectus of the final project is due next week(5 points)

-simple out line of an experiment

-number of samples

-names of the group members

-analysis proposed to test the hypothesis

desert plants
Desert plants

*dry environment

*evolved adaptation

-nurse plants (cactus)

-evade drought

-fleshy water storing leaves

-leaves only when water is abundant

-small size leaves

-cacti have spines rather than typical leaves

-root system adaptation

-fewer stomata and less evaporation

association between plants
Association between plants

* Nursing plant hypothesis(HA)

seedling cacti survive only in the shade of trees

and shrubs.

*predator hypothesis(HA)

*mutualism hypothesis(HA)

*random distribution (null hypothesis or H0)

target plants
Target plants

1- Carnegiea gigantea

Saguaro cactus

Straight spines

target plants6
Target plants

2- Ferocactus wislizenii

Barrel cactus

Hook end spines (curved)

target plants7
Target plants

3- Ambrosia deltoidea

Triangle Leaf Bursage,

(Rabbit Bush)

criteria for association
Criteria for association

1-height of the target plant 28cm (height of data sheet)

i.e. juvenile plant

2-base of the target plant lie below the branches of

tree or shrub.

each group of 3 must count 15 individuals for each target

and determine whether associated or not

test your hypothesis
Test your hypothesis

* Chi square X2

X2= (O-E)2

E

*45% represent nonrandom distribution

*degree or freedom 1

*Compare your results with table 1 appendix C

*is it significant or not

*due accept or reject the null hypothesis

test your hypothesis10
Test your hypothesis

Example: Saguaro cactus

associated non associated total

observed 70 25 95

Expected 45*95 = 43 55*95 = 52

100 100

X2=…..

important
Important

-watch out for rattlesnakes

-don’t put your hands under rocks

-look carefully under plants

slide12

Lab. Reports point distribution

  • Title: 1 point
  • Abstract: 4 points
  • Introduction: 3 points
  • Materials and methods: 1point
  • Results: 3 points
  • Discussion: 3 points