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:
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
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
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
Individual & Population Population Individual Species = all the in the world
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
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?
Quadrat - Density Sampling m 2 samples = 4242 6161 8080 m 2 4444 mean = 5.50 mean = 1.75
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.