Handout 9 - BILD3Fall2008 Section:Mon99:50AM HANDOUT9 I....

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BILD 3 – Fall 2008 Section: Mon 9-9:50 AM HANDOUT 9 I. Terms/phrases to know Lecture 25 (11-24-08) o Eutrophication  – process in which human activities produce large amounts of  ammonia and nitrate fertilizers, leading to too much nitrogen in the water and  consequently an overgrowth of certain primary producers such as the blue-green  algae and not others (blue-green algae tends to block sunlight from reaching  other primary producers and reduce oxygen in water) o Nitrogen fixation o Exponential growth o Intrinsic rate of natural increase o Logistic growth o Carrying capacity o Competition coefficients Lecture 26   (11-26-08) o Energy flow o Food web/chain o Biomass o Trophic levels o Primary producers o Primary consumers Page  1
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Section: Mon 9-9:50 AM o Secondary consumers o Tertiary consumers o Top predators o Demographic transition II. Important concepts Nitrogen cycle o Importance of nitrogen: synthesis of proteins and nucleic acids o Gaseous nitrogen (N 2 ) is abundant in the atmosphere but chemically unreactive  and unusable o Soluble, more usable forms of nitrogen:  ___________________ , ___________________ ,  ___________________ o Conversion to more usable forms is mostly carried out by bacteria through  nitrogen fixation , ammonification, and nitrification processes o Human production of ammonia and nitrate fertilizers leads to  eutrophication Too much nitrogen in water Leads to “algal blooms” Algae is a primary producer that is efficient in using up nitrogen but is  usually not eaten by primary consumers Hence, their overgrowth tends to… ___________________________________________________ _____
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Handout 9 - BILD3Fall2008 Section:Mon99:50AM HANDOUT9 I....

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