Chapter 37 pt 2

Chapter 37 pt 2 - Disturbance Storms, floods, fire,...

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Storms, floods, fire, droughts, overgrazing, human activities events Damage biological communities remove organisms alter the availability of resources Are characteristic of most communities, but the type and severity differ May have positive or negative impacts (or both) 0 Disturbance
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Ecological succession Is a transition in species composition of a community following a disturbance Usually certain species colonize very quickly, those are later replaced by other species 0
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0 Primary succession The gradual colonization of barren ground (no soil) First autotrophic bacteria Lichens and mosses Soil is formed by decomposing bacteria/moss and weathering of rocks Grasses and small shrubs As more soil is formed, larger organisms can be supported Very slow process, can take hundreds/thousands of years
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Secondary succession Occurs after a disturbance has destroyed a community but left the soil intact Storms, fires, floods, overgrazing/farming First colonized by “r” selected organisms Large offspring, fast sexual maturity, little parental care Very little competition Second are perennial grasses and small plants Third, softwood tree species (pines) Fourth, hardwood trees The permanent community depends on the environment (soil, topography, climate etc.) The animal species change based on available plant life 0
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Invasive Species Non-native plants and animals that have been introduced to an area, and spread from the point of original introduction Introduced by Storms Travel (on ships/planes/cars) Purposefully (biological control, pets) Can cause major environmental damage
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Chapter 37 pt 2 - Disturbance Storms, floods, fire,...

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