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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)

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Presentation on theme: "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)"— Presentation transcript:

1 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

2 Population Ecology  Population = group of individuals of the same species in a single area  (Population) Density = # of individuals (of the same species) per unit area

3 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 This Word Carefully

4 Individual & Population Population Individual Species = all the in the world

5 Plant Structure

6 Simple vs. Compound Leaves trifoliate bipinnate

7 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 Rosette Taraxacum officinale Erect Medicago sativa vining Convolvulus arvensis

8 Slope NS 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?

9 Quadrat - Density Sampling m 2 samples = m mean = 5.50 mean = 1.75

10 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.


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