lab 2. overview

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Lab 2. Overview Instructor collects lab. 1 write ups and checks pre-labs. in lab notebook Review of Lab Expectations (Exercises, Pre-Lab, and Attire) Overview of Populations, Plant Structure, and Quadrat Sampling. In-class plant structure examination Gather plant density data in field Return to lab room. Plant Tagetes patula (French marigolds) Exercise due in Lab 3 discuss. & questions

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Lab 2. Overview. Instructor collects lab. 1 write ups and checks pre-labs . in lab notebook Review of Lab Expectations (Exercises, Pre-Lab, and Attire) Overview of Populations, Plant Structure, and Quadrat Sampling. In-class plant structure examination Gather plant density data in field - PowerPoint PPT Presentation

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Page 1: Lab 2. Overview

Lab 2. Overview Instructor collects lab. 1 write ups and

checks pre-labs. in lab notebook Review of Lab Expectations (Exercises,

Pre-Lab, and Attire) Overview of Populations, Plant Structure,

and Quadrat Sampling. In-class plant structure examination Gather plant density data in field Return to lab room. Plant Tagetes patula (French marigolds) Exercise due in Lab 3 discuss. & questions

Page 2: Lab 2. Overview

Population EcologyPopulation = group of individuals of

the same species in a single area (Population) Density = # of individuals

(of the same species) per unit area

Page 3: Lab 2. Overview

Individual, Population, Species Individual (e.g., you, a tree)

Population = individuals of the same species in a single area (e.g., all people in Denver)

Species = the largest cluster of individuals that is genetically isolated from other groups of individuals and maintains its identity (e.g., all people in the world) ≈ “kind”

Use ThisWord

Carefully

Page 4: Lab 2. Overview

Individual & PopulationPopulation

Individual

Species = all the in the world

Page 5: Lab 2. Overview

Plant Structure

Page 6: Lab 2. Overview

Simple vs. Compound Leaves

trifoliatebipinnate

Page 7: Lab 2. Overview

Kinds of Plants (Ecological)Woody Plants =

Produce woody stems (trees & shrubs)

Herbaceous Plants = Do not produce woody stems

-Grasses-Forbs = not grasses

-Rosette growth form-Vining growth form-Erect growth form

RosetteTaraxacumofficinale

ErectMedicagosativa

viningConvolvulusarvensis

Page 8: Lab 2. Overview

Slope

N S

E

W

west-facing slope

east-facing slope

south-facing slope

north-facing slope

• What conditions of sun exposure, heat, and moisture would each slope experience?

Page 9: Lab 2. Overview

Quadrat - Density Sampling

m2

m2

m2

samples =samples =

42

61

80

m2

44

mean = 5.50mean = 1.75

Page 10: Lab 2. Overview

Reminders Before the Field READ the instructions () in the manual Develop hypotheses (two; 1 per species) now. Count the number of individuals of each of

the two species SEPARATELY in each quadrat.

Decide what it means to be “in” a quadrat. Base of plant?

Sample randomly in each area. “0” is still a value. Obtain your unpaired t-test P-value using

the online site linked to the course website.