BIOL2060 - Lecture 29 - Nov 22, 2013

Npsgovglbanaturescienceplantcategorieshtm 4 how do

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Unformatted text preview: ket http://www.nps.gov/glba/naturescience/plant_categories.htm 4 How do communities change over time? Example of primary succession: Glacier Bay 100 years after glacial retreat -Spruce seedlings under alder canopy http://www.nps.gov/glba/naturescience/plant_categories.htm How do communities change over time? Example of primary succession: Glacier Bay 200-1500 years after glacial retreat -Mature spruce-hemlock forest http://www.nps.gov/glba/naturescience/plant_categories.htm 5 # of plant species increases over time, but not many NEW species How do communities change over time? Example of primary succession: Glacier Bay Molles MC (2008) Ecology: Concepts & Applications How do communities change over time? Models and mechanisms of succession •  Relay Floristics model – Mechanism: Facilitation •  Initial Floristics model – Mechanisms: Tolerance and inhibition 6 Herbaceous weed - modifies environment where there is ONLY bare rock to become a location where plant-life may survive (maybe even thrive) How d...
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