Ch19 Ecological Succession and Community Development5.pdf

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University College Courses
Spencer Barrett

BIO120H © Lis| Page 511  ex. maple trees (native in NA, non-native in Europe)  seedlings from both grown on native soil were inhibited  on soil from non-native  growth increased  thus, soil org. associated w/ native species facilitate the establishment of non-native maples  in native soils, facilitating interactions of this kind are overshadowed by the inhibitory influence of natural enemies in the soil The Differing Adaptations of Early and Late Successional Species  early and late species have. diff. growth and reproduction strategies  early-stage: dispersal ability, tolerate stress  climax species: disperse and grow slowly, shade-tolerant seedlings, large size when mature; thus, more competitive than early  thus, there is a shift in the balance b/w adaptations promoting dispersal, rapid growth, early reproduction, and competitive ability enhancement  early have small, wind-dispersed seeds which can remain dormant  seed bank: dormant seeds in the soil that can germinate when conditions are favourable  climax have nutrient-filled seeds SUCCESSION BECOMES SELF-LIMITING AS IT APPROACHES THE CLIMAX  succession continues until the addition of new species to the sere and the exclusion of established species no longer change the envmt of the developing community  conditions change more slowly after the vegetation achieves the largest growth form the envmt can support  f
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