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COMMUNITY CHANGE (SUCCESSION)

COMMUNITY CHANGE (SUCCESSION). “the non-seasonal, directional and continuous pattern of colonization and extinction of species populations on a site”. Krebs chap. 21; pages 403-424; 431. PRIMARY SUCCESSION. Mt. St. Helens pp403-405. Lake Michigan dunes pp416-419. Glacier Bay pp413-416.

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COMMUNITY CHANGE (SUCCESSION)

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  1. COMMUNITY CHANGE (SUCCESSION) “the non-seasonal, directional and continuous pattern of colonization and extinction of species populations on a site” Krebs chap. 21; pages 403-424; 431

  2. PRIMARY SUCCESSION Mt. St. Helens pp403-405 Lake Michigan dunes pp416-419 Glacier Bay pp413-416

  3. SECONDARY SUCCESSION Abandoned fields Forest regrowth Krebs pp419-422 Abandoned lots

  4. Mount St. Helens Vegetation recovery

  5. Beach grass Vegetation hummock Sand dune ecology

  6. present past succession Fig 21.11 Profile of Lake Michigan sand dunes “SFT” – space-for-time substitution

  7. “Polyclimax” sand dune successions Fig. 21-12

  8. Ice recession in Glacier Bay, Alaska, since 1760 1940 1860 Krebs Fig. 21.7 1760

  9. Alders and cottonwoods covering the hillsides 50 years

  10. Spruce coming into the alder and cottonwood forest 100 years

  11. Spruce and hemlock forest 250 years

  12. Mineral soil Fig 21.9 Change in soil-N Topsoil

  13. Wildfire 1 year later

  14. Wind disturbance (“blowdowns”)

  15. Opax Mountain Silvicultural Systems Trial (near Kamloops, BC)

  16. Control burning

  17. Control burning

  18. Control burn plot

  19. Monitoring succession after fire

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