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Gs rig the pioneer community is typified by rapid

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Unformatted text preview: nity species may facilitate the appearance of later species by making the environment more favorable Gl. gs Rig – The pioneer community is typified by rapid colonizing opportunistic (r-type) species. Time to climax recovery following disturbance Mc Ca Bri se de me Gl. nt Gl. Community Succession 1900 1892 1913 (b) Dryas stage 1860 Reid Gl.1879 Glacier Bay 1830 1780 McBride glacier retreating • Glacier Bay, Alaska – Succession follows a predictable pattern of change in vegetation and soil characteristics – The climax community is a stable association of dominant K-type spets. 60 Pleasant Is. Soil nitrogen (g/m 2) 1760 50 40 30 20 10 0 PioneerDryas Alder Spruce Successional stage (d) Nitrogen fixation by Dryas and alder increases the soil nitrogen content. (c) Spruce stage Figure 53.24 Community Succession — Community Succession • You can see we’ve come full circle back to those life history concepts of r and K. • Dunes in Indiana were the first place succession was studied: from sand dunes to invading grasses to low shrubs to birches to other hardwoods. • Ponds and bogs will slowly fill with vegetation and transform into terrestrial habitat, eventually becoming forest. Secondary succession following The Intermediate Disturbance Hypothesis • Although few species are hardy enough to pioneer the colonization o...
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