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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

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Lab 2. Overview

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  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 speciesin a single area • (Population) Density = # of individuals (of the same species) per unit area

  3. Use This Word Carefully 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”

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

  5. Plant Structure

  6. Simple vs. Compound Leaves trifoliate bipinnate

  7. Rosette Taraxacum officinale Erect Medicago sativa vining Convolvulus arvensis 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

  8. south- facing slope north- facing slope east-facing slope Slope E • What conditions of sun exposure, heat, and moisture would each slope experience? west-facing slope N S W

  9. m2 m2 m2 m2 mean = 5.50 mean = 1.75 Quadrat - Density Sampling samples = samples = 4 2 6 1 8 0 4 4

  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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