General Ecology_Mahaffy_Date__051110

General Ecology_Mahaffy_Date__051110 - Community Ecology...

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Community Ecology continued… Community stability Ability to “remain the same” Resilience ability to return to the previous state/community once disturbed Resistance Resistant to change Relation to diversity and connectedness of food webs Greater diversity and connectedness means greater stability Bottom-up control vs. top-down control Bottom-up control Species at the bottom of the food web controls the structure of the community If you change the bottom species, you change the community structure Generally thought to be the more common of the two types of controls Top-down control Keystone/predator species controls the community structure Alternative stable states See figure 16.18 Hysteresis Reversal of the change may not result in a return to the original condition if the original shift was sufficiently large Examples Forest of Madagascar Marshes of Louisiana Current oil spills Disturbances can cause fragmentation of habitats Divide up continuous expanse of habitat into smaller “isolated” pieces
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General Ecology_Mahaffy_Date__051110 - Community Ecology...

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