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Lecture

Eco-Nov 25 lecture.pdf

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Department
Biology
Course
BIOL 2060
Professor
Chris Caruso
Semester
Fall

Description
Announcements -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 13 lecture, as well as in the News section of our Courselink site. -We will have lecture on Thursday November 28 , to make up for the lecture that we missed on Thanksgiving 1 Monday. Outline of Biol*2060 topics 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 2 1 COMMUNITIES AND ECOSYSTEMS 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? 3 How do communities change over time? 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 2 How do communities change over time? Models and mechanisms of succession 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? Testing mechanisms of succession on Mt. St. Helens •  Erupted May 18 ,1980 •  Experiment to test whether the mechanism of succession at Mt. St. Helens was facilitation, inhibition or tolerance http://vulcan.wr.usgs.gov/Volcanoes/MSH/Maps/may18_ashmap.html 3 How do communities change over time? Testing mechanisms of succession on Mt. St. Helens Treatments: • Control – no lupines • Lupines killed with herbicide and removed • Lupines killed but litter left in place • Lupines intact EarlLupinus (N fixer)Late successional species Late successional species 2 Anaphalis Chamarion How do communities change over time? Testing mechanisms of succession on Mt. St. Helens -Survival of Anaphalis and Chamarion highest in control treatment
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