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BIOL 1020 and BIOL 1021 - Lecture 19- Population Ecology-2 and Community Ecology-1 -
Assigned Readings in Textbook:
Chapter 46 (section 46.5) – Metapopulation Dynamics (pages 1015 to 1019)
Chapter 47 (section 47.1) – The Niche (pages 1022 to 1023)
Chapter 47 (section 47.2) – Antagonistic Interactions between Species (pages 1023 to 1028)
Chapter 47 (section 47.3) – Mutualistic Interactions between Species (pages 1023 to 1031)
Use the following wireframe outline to make notes on the content presented in Lecture 19
Refer to Chapter 46 and Chapter 47 in your textbook and the Chapter 46 and Chapter 47
resources on LaunchPad to supplement your notes and aid in studying this material
Population Ecology:
1. What is a metapopulation?
Large populations made up of many smaller populations linked by migrations
2. What are biogeography?
• The study of patterns of distributions of populations, species, and communities among
biogeographic regions
- Geological history of regions profoundly influences kinds of organisms found
Causes of the distribution of species were only speculated upon until three scientific
advances occurred:
- Acceptance of theory of continental drift / plate tectonics
- Development of phylogenetic taxonomy
- Development of the Theory of Island Biogeography
3. What does the theory of island biogeography explain?
• Rate of arrival of new species to an island will gradually decrease as all species from the
species pool arrive at the island
• As more species colonize the island, extinction rate will also increase
— resources must be divided among species, — populations may be small, increasing
the probability of extinction
1
, 4. What is the main message of the theory of island biogeography?
• Extinction rates will be higher on small islands, because population sizes are generally
small
• Fewer immigrants are expected to reach islands far from the mainland
• Model predicts number of species for islands of
- different size
- different distance from mainland
Community Ecology: = Study of communities in relation to the environment
1. What is a community?
An assemblage of all of the populations of various species that live and interact within a
given area at a given time
2. What is a niche?
A species’ special ecological role in its community
2
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