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Unformatted text preview: ly lifeless ground by natural succession CH05-15 Natural Succession: Life on Lifeless Ground Primary succession Secondary succession mature ecosystems form on barren ground where none previously existed longterm repair process that takes place after an ecosystem is destroyed occurs more rapidly than primary succession: no need to form soil CH05-16 Fig. 6-7b Primary succession CH05-17 Changes During Succession Biotic and abiotic conditions change Pioneer and intermediate communities alter conditions During succession, two of the most notable changes are: Promotes the growth of new communities New communities replace them climax communities an increase in species diversity ecosystem stability CH05-18 Evolution: Responding to Change The ability of species to evolve in response to changes in biotic and abiotic conditions has contributed to the sustainability of life on Earth CH05-19 Evolution by Natural Selection Natural selection Driving force behind evolution: survival of the fittest Weeds out less adapted members of a population "Selects" members...
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This note was uploaded on 04/17/2008 for the course ENVIRON MN 0630.201.0 taught by Professor Lisagreenwood during the Winter '07 term at RIT.
- Winter '07