Plant Competition. Today we will… Understand differences between intraspecific and interspecific...
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Transcript of Plant Competition. Today we will… Understand differences between intraspecific and interspecific...
Plant Competition
Today we will…
• Understand differences between intraspecific and interspecific competition
• Measure plant competition in Sanford Woodlot
• Apply our knowledge of correlations to understanding competition dynamics
Competition
Intraspecific (within species) Interspecific (between species)
CompetitionIntraspecific (within species) Interspecific (between species)
Competition
Direct Indirect• Effects of one species
impact another species indirectly
• Apparent Competition• Exploitative Competition
Animals: physical combatPlants: release of toxins
Apparent Competition (Indirect)
Abundance of one species increases likelihood of consumption of other species
Exploitative Competition (Indirect)
Individuals use same limiting resource (most common type of competition)
Why is it important to understand competition dynamics and outcomes?
What are the trade-offs between conducting
controlled, manipulative experiments and observational studies?
Today’s Activity: Measuring Competition
• Read over page 65
Today’s Activity: Measuring Competition
• We will measure:
– Intraspecific competition in beech trees
– Interspecific competition between beech trees and other trees (collectively)
Today’s Activity: Measuring Competition
• Methods: What will you do?
–Along transect, find focal beech tree, measure DBH
– From that tree measure DBH of nearest beech and nearest “other” tree
–Continue at every 6 meters (6 focal trees total)
Today’s Activity: Measuring Competition
• Each team needs
– One 30-meter tape
– Coursepack
– Writing utensils
Data Analysis & Results
• Calculate mean, standard deviation, and correlation coefficient using Excel sheet (ANGEL)
• Graph results
• Answer questions on page 66
• Class discussion of results
• Quiz