Final Sample Questions - • Would you expect higher rates...

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Would you expect higher rates of germination and higher seedling density in gaps or under the canopy? Why?
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Describe the difference between Primary and Secondary succession. Which is faster? Under what conditions do you expect an ecosystem to undergo Primary succession? Secondary? Think about ways the seed bank (e.g. dormancy) and seed predators might affects succession Primary - when an area has no soil base and it requires plants such as lichen to colonize the rocks, then mosses and eventually herbaceous plants Secondary - soil is already present and some disturbance has cleared the dominant vegetation Secondary is faster – primary can take 100s of years Primary: We see it after landslides or on recent volcanic lava fields in tropics Secondary: conversion of former agricultural field
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Phases of successsion Phase 1- rapid colonization – herbs, shrubs, climbers; lasts 3 years  Phase 2- short lived but fast growing pioneer trees form a canopy; 10-30 years  Phase 3- non-pioneer heliophilic trees, increase in biomass, species richness, increase shade plants; competition thought to drive this process; 30-100 years  Phase 4- full canopy structure, lots of shadetolerant plants
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  • Winter '11
  • GIBSON

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