bio lect 36

bio lect 36 - bio lect 36 Ecosystems Succession is the...

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bio lect 36 Ecosystems: Succession - is the ordelrly and repeated changes in a community over time. -primary + secondary succession Primary - u have soil, secondary- you need to make teh soil. Successional processes: -Facilitation; early arrival makes teh environment better for later species - Tolerance; later species out compete earlier species - Inhibition; need distrbance for new species to be able to get proper resources. - tilman's resource ratio; successional processes Seres - teh differetn successional stages. -early succesional stages -middle successional stages - late successional stages. They will lead eventaully to a climax community (last successional stage). we have equilibrium in number and competition of species. During succession - species taht are more durable competitors replace first colonizing species. Then predation, symbiosis, parasitism, and competition all result in greater species richness. Now: Helicopsyche After 8 weeks, there was a lot of HP on ungrazed and the grazed was kept in early successional stages. grazed - r selected species. fastest growth possible. HP kept the algae communities in Early successional stages ungrazed - later successional stages. We have the r-selected species being replaced
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This note was uploaded on 05/10/2010 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.

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bio lect 36 - bio lect 36 Ecosystems Succession is the...

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