class notes 1.25

class notes 1.25 - Bio 1006 Look at the movement of energy...

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Bio 1006- 1/25/10 Look at the movement of energy through ecosystems Pyramid of Numbers (number of individuals in each level) Biomass: measure of stored energy (calories) Productivity: how much biomass is produced in a year, represented by g/m^2/ year Trophic Structure: “Feeding levels” Trophic levels: represent food chains and the amount of energy in each level o Top Consumer (top carnivore) o Tertiary Consumer o Secondary Consumer o First Consumer o Producers In a pyramid of Biomass, you are measuring the amount of energy in each level No transfer of energy is complete, as you go from producer to primary consumer some energy is lost/released Carbon Cycle: o Sources of carbon- living things, CO2 (.03%), Minerals and Carbonates (limestone, Hokie Stone), Fossil Fuels o All these sources add carbon to the atmosphere o Respiration, Industrial pollution, from fossil fuels, erosion of minerals Nitrogen Cycle: o 78% of atmosphere is nitrogen o Nitrogen is an inter gas (it is difficult to make it combine with other gasses) o Importantance to Lving things- Component of proteins and other biological molecules Aids in the growth of plants Nitrates, nitrites o Addition to the atmosphere Nitrogen fixation from Bacteria Erosion from minerals Run off from fertilizers
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This note was uploaded on 01/18/2012 for the course BIO 1006 taught by Professor Staff during the Spring '10 term at Virginia Tech.

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class notes 1.25 - Bio 1006 Look at the movement of energy...

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