BIOL 2060 Lecture Notes - Anaphalis, Community Structure, Herbicide

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-An updated schedule of lectures and readings has been
posted on Courselink.
-Posting of clicker marks is still delayed by technical
problems.
-Information on the final exam is included in the slides
for the November 13th lecture, as well as in the News
section of our Courselink site.
-We will have lecture on Thursday November 28th, to
make up for the lecture that we missed on Thanksgiving
Monday.
Announcements
2
SECTION I: WHAT IS ECOLOGY AND HOW DO WE STUDY IT?
SECTION II: EFFECT OF THE ABIOTIC ENVIRONMENT ON
THE DISTRIBUTION OF ORGANISMS
SECTION III: EFFECT OF THE BIOTIC AND ABIOTIC
ENVIRONMENT ON THE ABUNDANCE OF ORGANISMS
SECTION IV: EFFECT OF SPECIES INTERACTIONS ON THE
DISTRIBUTION AND ABUNDANCE OF ORGANISMS
SECTION V: COMMUNITIES AND ECOSYSTEMS
Outline of Biol*2060 topics
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1.What is a community and how do we quantify
community structure?
2.How do communities change over time?
3. Food chains and top-down vs. bottom-up
control
4. What stabilizes communities?
5. What is an ecosystem?
6. How do we measure energy flow through an
ecosystem I?
7. How do we measure energy flow through an
ecosystem II?
COMMUNITIES AND ECOSYSTEMS
Relay Floristics model
Mechanism: Facilitation, where early
successional species modify the
environment so that it becomes less suitable
for themselves and more suitable for later
successional species
How do communities change over time?
Models and mechanisms of succession
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Initial Floristics model
Mechanism: Tolerance, where the species
that are tolerant of the environmental
conditions early in succession dominate later
successional stages
Mechanism: Inhibition, where the species
that first establish in an area modify the
environment to make it unsuitable for all
other species
How do communities change over time?
Models and mechanisms of succession
Erupted May 18th,1980
Experiment to test whether
the mechanism of
succession at Mt. St.
Helens was facilitation,
inhibition or tolerance
How do communities change over time?
Testing mechanisms of succession on Mt. St. Helens
http://vulcan.wr.usgs.gov/Volcanoes/MSH/Maps/may18_ashmap.html
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Document Summary

An updated schedule of lectures and readings has been posted on courselink. Posting of clicker marks is still delayed by technical problems. Information on the final exam is included in the slides for the november 13th lecture, as well as in the news section of our courselink site. We will have lecture on thursday november 28th, to make up for the lecture that we missed on thanksgiving. Section ii: effect of the abiotic environment on. Section iii: effect of the biotic and abiotic. Section iv: effect of species interactions on the. Models and mechanisms of succession: relay floristics model. Mechanism: facilitation, where early successional species modify the environment so that it becomes less suitable for themselves and more suitable for later successional species. Mechanism: tolerance, where the species that are tolerant of the environmental conditions early in succession dominate later successional stages.

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