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Biol 201 - Notes - 4.15.2009

Biol 201 - Notes - 4.15.2009 - Succession on bare rock I...

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Succession on bare rock I: Lichens first - Mutualism between fungus and alga - Lichen provides drought-resistance covering II: - Allow thing to start growing   mosses III: - Vascular plants in decayed moss and lichen Eventually get trees growing out of rock Succession : gradual change in plant and animal commuinities in an area following disturbance - Primary succession  on newly exposed geological substrates, may follow: o Lava flows o Sand dune formation o Landslides o Receding glaciers - Secondary succession  following disturbance that does not destroy soil or create new  substrate (you’re not starting from scratch) o Abandonment of agricultural land o Various kinds of wind disturbances such as hurricanes o Fires o Disturbances by animals - Climax communities  are relatively stable communities that occur after long periods of  succession - Pioneer species - Chronosequences
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