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Essential questions• What limits the production in ecosystems?• How do nutrients move in the ecosystem?• How does energy move through the ecosystem?
Ecosystem• All the organisms in a community plus abiotic factors– ecosystems are ______________________&
__________________________• Ecosystems are self-sustaining– what is needed?
capture energy transfer energy cycle nutrients
capture energy transfer energy cycle nutrients
biosphere
Ecosystem inputs
constant inputof energy
energy flowsthrough
nutrients cycle
nutrients can only
cycleinputs energy nutrients
inputs energy nutrients
Matter cannotbe created or
destroyed
consumers
decomposers
abioticreservoir
nutrientsmade availableto producers
geologicprocesses
Generalized Nutrient cycling
consumers
consumers
producers
decomposers
abioticreservoir
nutrientsENTER FOOD CHAIN
= made availableto producers
geologicprocesses
Decompositionconnects all
trophic levels
return toabiotic
reservoir
Carbon cycleCO2 in
atmosphere
Diffusion RespirationPhotosynthesis
Photosynthesis
Plants and algae
PlantsAnimals
Industry and home
Combustion of fuels
Animals
Carbonates in sediment
Bicarbonates
Deposition ofdead material
Depositionof deadmaterial
Fossil fuels(oil, gas, coal)
Dissolved CO2
___________________: CO2 in atmosphere
___________________: photosynthesis =
carbon fixation in Calvin cycle
___________________: decomposition
___________________: respiration combustion
___________________: CO2 in atmosphere
___________________: photosynthesis =
carbon fixation in Calvin cycle
___________________: decomposition
___________________: respiration combustion
Birds
Herbivores
Plants
amino acids
CarnivoresAtmospheric
nitrogen
loss to deep sediments
Fish
Plankton withnitrogen-fixingbacteria
Nitrogen-fixingbacteria
(plant roots)
Nitrogen-fixingbacteria
(soil)
Denitrifyingbacteria
Death, excretion, feces
Nitrifying bacteria
soil nitrates
excretion
Decomposing bacteria
Ammonifying bacteria
Nitrogen cycle _____________________: N in atmosphere
_____________________: nitrogen fixation by soil & aquatic bacteria_____________________: decomposing &
nitrifying bacteria animal wastes
_____________________: denitrifying bacteria
_____________________: N in atmosphere
_____________________: nitrogen fixation by soil & aquatic bacteria_____________________: decomposing &
nitrifying bacteria animal wastes
_____________________: denitrifying bacteria
Phosphorus cycle
Loss to deep sediment
Rocks andminerals
Soluble soilphosphate
Plants andalgae
Plants Urine
Land animals
Precipitates
Aquaticanimals
Animal tissueand feces
Animal tissueand feces
Decomposers(bacteria and
fungi)
Decomposers(bacteria & fungi)
Phosphatesin solution
Loss indrainage
_____________________: rocks, minerals, soil
_____________________: erosion releases
soluble phosphate uptake by plants
_____________________: decomposing bacteria
& fungi_____________________: loss to ocean sediment
_____________________: rocks, minerals, soil
_____________________: erosion releases
soluble phosphate uptake by plants
_____________________: decomposing bacteria
& fungi_____________________: loss to ocean sediment
Lakes
Runoff
Percolation in soil
Evaporation
Transpiration
Precipitation
Oceans
Solar energy
AquiferGroundwater
Water cycle
Water vapor
_____________________: surface & atmospheric
water_____________________: precipitation & plant uptake_____________________: transpiration_____________________: evaporation & runoff
_____________________: surface & atmospheric
water_____________________: precipitation & plant uptake_____________________: transpiration_____________________: evaporation & runoff
Breaking the water cycle• Deforestation breaks the __________________– groundwater is not transpired to the atmosphere, so
precipitation is not created
forest desert
desertification
Repairing the damage• The Greenbelt Movement
– planting trees in Kenya– restoring a _______________ecosystem– establishing democracy– empowering women
Wangari MaathaiNobel Peace prize 2004Nobel Peace prize 2004
Effects of deforestationC
on
cen
trat
ion
of
nit
rate
(m
g/l
)
1965 1966Year
2
0
4
40
80
1967 1968
Deforestation
nitrate levels in runoff
40% increase in runoff loss of water
40% increase in runoff loss of water
60x loss in nitrogen 10x loss in calcium
60x loss in nitrogen 10x loss in calcium
loss into surface water
loss out of ecosystem!
Why isnitrogen soimportant?
Energy flows through ecosystems
sun
producers (plants)producers (plants)
loss of energy
loss of energy
secondary consumers(carnivores)
secondary consumers(carnivores)
primary consumers(herbivores)
primary consumers(herbivores)
Food chains• Trophic levels– feeding relationships– start with
____________________– captured by __________• 1st level of all food chains
– food chains usually go up only 4 or 5 levels• inefficiency of energy transfer
– all levels connect to ____________________ Fungi
Level 4
Level 3
Level 2
Level 1
Decomposers
Producer
Primary consumer
Secondary consumer
Tertiary consumer
top carnivore
carnivore
herbivore
Bacteria
autotrophs
heterotrophs
sun
Inefficiency of energy transfer• Loss of energy between levels of food chain– To where is the energy lost? _______________________
only this energymoves on to the
next level in the food chain
17%growth
50%waste (feces)
33%cellularrespiration
energy lost todaily living
energy lost todaily living
sun
Ecological pyramid• Loss of energy between levels of food chain– can feed fewer animals in each level
1,000,000,000
100,000
100
1
sun
Humans in food chains• Dynamics of energy through ecosystems have important
implications for human populations– how much energy does it take to feed a human?• if we are meat eaters?• if we are vegetarian?