pre-lab ap lab #12. ecosystem studies 1. energy flow 2. chemical cycling ap lab #12 we will be able...
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Pre-Lab AP Lab #12
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Ecosystem Studies1. Energy Flow2. Chemical Cycling
AP Lab #12 we will be able to study both cycles
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AP LAB #12Part a - Dissolved Oxygen in waterPart b – Primary ProductivityPart c – Identifying Aquatic
Organisms
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Vernier ProbesDO Probe = dissolved oxygenCalculator will calculate %O2Laptops to collect data.
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Part a – Dissolved OxygenObjectives – 1.identify the effect of varying
temperature on amount of dissolved oxygen in a water sample.
2.set up and calibrate Dissolved oxygen probe with calculator
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Prediction1. How will lower temperatures impact
dissolved oxygen in water?
o SLOW down gas molecules, more will remain in water rather than escape from surface.
2. How will higher temperatures impact dissolved oxygen in water?
SPEED up the interactions of the gas molecules with the surface more molecules will escape.
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12b - Primary ProductivityEquation NPP = GPP – Rs
Where . . .NPP = Net Primary ProductivityGPP = Gross Primary ProductivityRs = Respiration
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Primary Productivity The rate at which light energy is
captured by autotrophs or primary producers.
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Ps - photosynthesis
6 CO2 + 12 H2O + Light energy C6H12O6 + 6 O2 + 6 H2O
First basic form of energy storage is termed Primary Production.Total Ps = gross primary productivity
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Primary ProducersProducers need energy to
survive!50 - 90% of GPP is lost to Rs by
the primary producers.NPP = 10 - 50%Animals - use only NPP, which
limits the food webs.
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Rs = Respiration
C6H12O6 + 6 O2 6 CO2 + 6 H2O + ATP
Cellular respiration is required to release energy to do Ps
Natural Systems equilibratePs : Rs
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Interactions of both processes
Ps > Rs excess energyGrowth or Reproduction
Ps = Rs maintenancePs < Rs consumption of
stored biomass
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Measuring ProductivityWhat substance is present in
both Ps and Rs that can be measured in a high school setting?
CO2 levels
O2 levels
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Ps vs. RsO2 levels CO2
levels
Ps > RsPs = Rs Ps < Rs
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Part C: Identifying Aquatic OrganismsUse MicroscopeUse General Guide to Pond LifeSketch and Identify organismsLabel sketches and note type
ProducerConsumer – specific type