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Unformatted text preview: The “countdowns” continue… • Last regular-session exam – Monday, April 30, 10:00 – 11:00 am • Final Exam – Thursday, May 3, 8:00 – 10:00 am Community ecology Readings: Ch. 53, p. 1159-1170; Ch. 50, p. 1080-1082; Ch. 1, p. 21-23 Community Ecology • A community is a collection of plants, animals, fungi, protists, etc. living in the same area and either directly or indirectly interacting – Predator – prey – Associations (e.g., mycorrhyzal fungi; lichens; corals) – Competitors Predator-prey cycles Time (years) Which graph is the hare and which is the lynx? Living creatures have evolved some very interesting ways of avoiding predation Fig. 53.5 Crypsis Some species mimic the appearance of others to gain protection from predators Fig. 53.6 Warning signs! Lichens are one of the best known examples of an association between two organisms Remember the tree-fungus-Indian Pipe system? Communities vary • In space – Vertically • Forest: ground to canopy • Lake: sediments to surface – Horizontally • Lake shore to uplands; river to uplands • Latitudinal changes • In time – Succession (short-term); ice ages (long-term) Links between adjacent habitats and their communities can be seasonal......
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- Spring '08
- Ecology, Charles Sutherland Elton, community structure, · Lake