1 mon. tues. wed. thurs. fri. week of nov. 17 river ecology lab – dress for weather lab exam...
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Mon. Tues. Wed. Thurs. Fri.
Week ofNov. 17
River ecology lab – dress for weather
LabExam(bring calc.)
Week ofNov. 24
No lab – Thanksgiving
Nolecture
Week ofDec. 1
Independent project presentations
Exam 3
Week ofDec. 8
FinalExam Dec. 11
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Sp. interactions – 1718 (through fig. 18.7),1920 (only covering p. 391)
Community ecology – 2122
Don’t read 23,25, and 26 just yet
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Structure of course
Environmental variability
Organisms
Ecosystems
Populations
Species interactions
Communities
Applied Ecological Issues
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Communities
What is a community?
How are communities described?
How are species organized within a community?
How do communities change over time?
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How are species organized within a community?
Webs!
Connectedness webs
Energy webs
Functional webs (interaction webs)(these are what we drew when talking
about species interactions)
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Keystone species – species that have large
impacts on structure of the community they
inhabit despite having relatively low biomass
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Bottom – up – increasing primary producer increases production at all levels
Top-down – increasing biomass of top consumerincreases production in every other level
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Communities
What is a community?
How are communities described?
How are species organizedwithin a community?
How do communities change over time?
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Succession – gradual change in plant and
animal communities in an area following a
disturbance or the creation of a new substrate
primary vs. secondary
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Primary succession – occurs on new
geological substrates
Secondary succession – occurs after
destruction of aboveground community but
substrate is still intact
Examples??
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New substrate
Climaxcommunity
Disturbed area
Multiplesuccessional
stages
Multiplesuccessional
stages
Primarysuccession
Secondarysuccession
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Why does succession occur???
1. Organisms change environment during succession - how?
2. Organisms face trade-offs
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Why does succession occur???
1. facilitation
2. inhibition
3. tolerance
Mechanisms for species establishment
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Why does succession occur???
1. facilitation
2. inhibition
3. tolerance
Mechanisms for species establishment
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Why does succession occur???
1. facilitation
2. inhibition
3. tolerance – establishment not dependent on which species are already there
Mechanisms for species establishment
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1. Annual plants
2. Herbaceous perennials
3. Early sucessional trees/shrubs
4. Late successional trees
Succession on abandoned fields
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