bio lect 38

bio lect 38 - bio lect 38 san francisco bay 5 rules....

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bio lect 38 san francisco bay 5 rules. ecosystem and succession are inter related. 1. redwood grove. all trees grow up. but the productivity doesnt go up Helicopsyche and periphyton -ungrazed tiles clearly have more biomass of algae than in the tile grazed by helicopsyche - but algae on tiles grazed by Helicopsyche produced 6X more oxygen per unit area. Higher net primary production than algae on the ungrazed tiles. - algae population on the grazed tiles were kept in exp. growth y HP grazing those on the ungrazed tiles were in logistic growth. - algae on the grazed tiles were in the early successional stages; algae on the ungrazed tiles developed into later successional stages. not produces much before they dont PS much. feeding on algae, grazing increases the growth. Grazers mow that lawns and keep it on highest possible productivity. Primary productivity - rate of accumulation relative to biomass. schistosomiasis: an ecosystem disease -caused by blood flukes in teh genus schitosoma. 1/20 people in teh world have Schistosomiasis 800,000 deathes per yr. closely related to swimmer's itch in US very debilitating disease. Very important infectious disease. LC :humans and snails. in water they have realses in urine or feces. They goo on snails. Flatworms know how to
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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 38 - bio lect 38 san francisco bay 5 rules....

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