Lecture 22 Community Ecology IIbb

Lecture 22 Community Ecology IIbb - The Colonizers through...

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Unformatted text preview: The Colonizers through Time Pioneer species (“r”) Mid successional/Climax (“K”) Successional Sequence • Facilitation • Tolerance • Inhibition Effect on subsequent species 1. Facilitation (+) N-Fixation: Alder Boreal forests N-Fixation: Black Locust Restoration of Mined land Protection from Extremes Breaking down parent material 2. Tolerance (0) Tolerance of Shade Inhibition (-) Tree of Heaven: Allelopathy Teak Plantations: shade Conifer plantations: acidity An Example of Species Effects in Primary Succession Pioneers moss fireweed Dryas (N-fixing) Dryas Alder tree moss dryas Alder (N-fixing, lowers pH) 50 yrs Spruce/Hemlock under the Alder thicket (100 years) Old Growth: Spruce and Hemlock (200 years) An Example of Secondary Succession CRAB GRASS PINES HARDWOODS OLD Field Succession LIGHT-DEMANDING SHADE-TOLERANT ASTERS Horseweed crabgrass aster Inhibition: competition (2 yrs) Facilitation (3-4 years) Grows best in aster roots aster broomsedge Tolerance (shade) (10-15 years) broomsedge Virginia pine Facilitation: germination (50 yrs) Virginia pine Oak 120 years 3000 stems per acre Result pine hardwoods ~ 100 years Oak-Hickory Forest Using our understanding of succession in forest restoration Degraded Forest Community Diversity & Disturbance Factors that affect community diversity...
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This note was uploaded on 10/22/2009 for the course BIO 124 taught by Professor Griscom during the Spring '07 term at James Madison University.

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Lecture 22 Community Ecology IIbb - The Colonizers through...

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