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Do9Now:)Unit)10)FRQs)• Discuss)and)plan)out)FRQ)A)from)the)worksheet))
• If)you)have)Jme,)you)may)begin)your)response)
2
Announcements)• Upcoming)
– 500)shmoints)must)be)completed))– 2)PracJce)Tests)(with)FRQs))must)be)completed)!)see)Ms.)Fleming)• If#not#completed,#will#be#required#to#complete#3#prac6ce#tests#
Shmoop)Leaders!)P.#2#Leaders# P.#4#Leaders#
Kirsten)514) Enrique)820)
Gloria)506) Melissa)Marquez)704)
KirsJ)498) Kailey)604)
Ms.#Fleming#582#
CW/HW)Assignments)18. )Unit)10)PracJce)FRQs)))
PLANNER • Finish Ch. 55 Notes Outline • Finish Unit 10 Practice FRQs • 2 Practice Tests (shmoop) must be completed by Monday/
Tuesday • Test " " "
EssenJal)knowledge)standards)• 2.A.1:#All#living#systems#require#constant#input#of#free#energy.#
• 2.D.1:#All#biological#systems#from#cells#and#organisms#to#populaCons,#communiCes,#and#ecosystems#are#affected#by#complex#bioCc#and#abioCc#interacCons#involving#exchange#of#maHer#and#free#energy#
• 4.A.6:#InteracCons#among#living#systems#and#with#their#environment#result#in#the#movement#of#maHer#and#energy#
FLT)• #I#will#be#able#to:#– DisJnguish)between)the)following)sets)of)terms:)primary)and)secondary)producJon;)producJon)efficiency)and)trophic)efficiency)
– Explain)how)the)first)and)second)laws)of)thermodynamics)apply)to)ecosystems))
– Define)and)compare)gross)primary)producJon,)net)primary)producJon,)and)standing)crop)
– Explain)why)energy)flows)but)nutrients)cycle)within)an)ecosystem)
• By#comple6ng#Ch.#55#Notes#
C.)Primary)ProducJvity)1. Define)Primary#producCon#=#amount#of#light#energy#converted#to#chemical#energy#(synthesis#of#sugars#via#photosynthesis)#by#autotrophs#in#a#given#Cme#period#)
11
C.)Primary)ProducJvity)2.#Gross#Primary#ProducCvity#=#GPP#=#total#primary#producCon###3.#Net#Primary#ProducCvity#=#NPP#=#GPP#T#R#(energy#used#by#primary#producers#for#respiraCon).#• In)other)words,)NPP)represents)the)difference)between)the)rate)at)which)plants)photosynthesize)and)the)rate)at)which)they)respire.))))
• NPP#is#the#energy#available#to#consumers###)
12
C.)Primary)ProducJvity)• 3.)Net)Primary)ProducJvity))a. Biomass#=#total#mass#of#living&organisms&(plants#
and#animals)#in#a#given#area##b. Standing#crop#=#total#biomass#of#photosynthe1c&
autotrophs#at#a#parCcular#Cme##• Measuring)biomass)helps)us)measure)producJon)and)use)of)resources)
)
14
C.)Primary)ProducJvity)3.)Net)Primary)ProducJvity))c-e: Tropical rain forests, estuaries, and coral reefs are among the most productive ecosystems per unit area )
15
D.)Energy)Transfers)and)Ecological)Pyramids)1. Secondary)producJvity)Consumers)do)not)use)all)the)biomass)they)consume)(ex/)some)is)excreted)as)waste).)))))
17
D.)Energy)Transfers)and)Ecological)Pyramids)1. Secondary)producJvity)• Some energy must be used for metabolism • Whatever is left over is the new biomass ))
18
D.)Energy)Transfers)and)Ecological)Pyramids)1. Secondary#producCvity#=#rate#at#which#
heterotrophs#(consumers)#convert#their#food#(chemical#energy)#into#their#own#biomass#(transfer#between#trophic#levels)#
))
19
D.)Energy)Transfers)and)Ecological)Pyramids)2.)Ecological)efficiency)• Is all NPP transferred to the next trophic level?
))
21
D.)Energy)Transfers)and)Ecological)Pyramids)2.)Ecological)efficiency)• When a caterpillar feeds
on a leaf, only about one-sixth of the leaf�s energy is used for secondary production
))
22
Fig. 55-9
Cellular respiration 100 J
Growth (new biomass)
Feces
200 J
33 J
67 J
Plant material eaten by caterpillar
D.)Energy)Transfers)and)Ecological)Pyramids)2.#Ecological#efficiency##Trophic#efficiency#is#the#%#of#producCon#transferred#from#one#trophic#level#to#the#next#• Energy#transfer#between#trophic#levels#is#typically#only#10%#efficient#(approximate)
• Trophic efficiency is multiplied over the length of a food chain
• Approximately 0.1% of chemical energy fixed by photosynthesis reaches a tertiary consumer
)) 24
D.)Energy)Transfers)and)Ecological)Pyramids)3.)Loss)of)energy)in)a)food)chain)can)be)represented)by)a))
)a.#Pyramid#of#producCvity#=#Pyramid#where#net#producCon#represents#the#loss#of#energy#with#each#transfer#in#a#food#chain.##Always#upright.#)))
27
D.)Energy)Transfers)and)Ecological)Pyramids)3.)Loss)of)energy)in)a)food)chain)can)be)represented)by)a))
)b.#Biomass#pyramids#=#shows#biomass#of#each#trophic#level##can#be#used#to#represent#the#amount#of#energy#available#at#each#trophic#level##!)Most)pyramids)show)a)sharp)decrease)at)successively)higher)trophic)levels)))))
29
AddiJonal)Notes)• Note: an energy pyramid will always be right
way up because energy is lost between each trophic level (2nd law of thermodynamics)
• However, sometimes a biomass pyramid can be inverted
• Inverted Example: in certain aquatic ecosystems, producers (phytoplankton) are consumed so quickly that they are outweighed by primary consumers
• The)rapid)rate)of)reproducJon)for)phytoplankton)sustains)this)pagern)
31
AddiJonal)Notes)• Dynamics of energy flow in ecosystems have
important implications for the human population • Eating meat is a relatively inefficient way of
tapping photosynthetic production • Worldwide agriculture could feed many more
people if humans ate only plant material
33
AddiJonal)Notes)• The green world hypothesis proposes several
factors that keep herbivores in check: – Plant defenses – Limited availability of essential nutrients – Abiotic factors – Intraspecific competition – Interspecific interactions
34
PairTShareTRespond#1. Define)primary)producJvity,)and)disJnguish)
between)GPP)and)NPP)2. Define)secondary)producJvity,)and)explain)how)it)
relates)to)ecological)efficiency))3. What)are)the)two)main)types)of)ecological)
pyramids?))What)do)the)levels)represent?)))4. Compare)and)contrast)a)pyramid)of)producJvity)
with)a)biomass)pyramid)
35
A.)Biogeochemical)cycles)• Biogeochemical#cycles#=#the#cycling#of#maHer#through#bioCc#and#abioCc#components#of#a#system#
• Life)depends)on)recycling)chemical)elements)
37
Fig. 55-13 Reservoir A Reservoir B
Organic materials available
as nutrients Fossilization
Organic materials unavailable as nutrients
Reservoir D Reservoir C
Coal, oil, peat
Living organisms, detritus
Burning of fossil fuels
Respiration, decomposition, excretion
Assimilation, photosynthesis
Inorganic materials available
as nutrients
Inorganic materials unavailable as nutrients
Atmosphere,soil, water
Minerals in rocks
Weathering, erosion
Formation of sedimentary rock
• In studying cycling of water, carbon, nitrogen, and phosphorus, ecologists focus on four factors: – Each chemical�s biological importance – Forms in which each chemical is available or used
by organisms – Major reservoirs for each chemical – Key processes driving movement of each chemical
through its cycle
40
AddiJonal:)The)Water)Cycle)• Water is essential to all organisms • 97% of the biosphere�s water is contained in
the oceans, 2% is in glaciers and polar ice caps, and 1% is in lakes, rivers, and groundwater
• Water moves by the processes of evaporation, transpiration, condensation, precipitation, and movement through surface and groundwater
41
Fig. 55-14a
Precipitation over land
Transport over land
Solar energy
Net movement of water vapor by wind
Evaporation from ocean
Percolation through soil
Evapotranspiration from land
Runoff and groundwater
Precipitation over ocean
C.)The)Carbon)Cycle)• Carbon-based organic molecules are essential
to all organisms • Carbon reservoirs: fossil fuels, soils and
sediments, solutes in oceans, plant and animal biomass, and the atmosphere – CO2 is taken up and released through
photosynthesis and respiration – Volcanoes and the burning of fossil fuels
contribute CO2 to the atmosphere
43
Fig. 55-14b
Higher-level consumers Primary
consumers
Detritus
Burning of fossil fuels and wood
Phyto- plankton
Cellular respiration
Photo- synthesis
Photosynthesis
Carbon compounds in water
Decomposition
CO2 in atmosphere
D.)The)Nitrogen)Cycle)Main#reservoir:#atmospheric#N2###1. Nitrogen)FixaJon)• N2#must#be#converted#to#NH4
+#or#NO3–#for#uptake#
by#plants,#via#nitrogen#fixaCon#by#bacteria#)
45
D.)The)Nitrogen)Cycle)4.)AmmonificaJon)Organic nitrogen is decomposed to NH4
+ by ammonification#
47
Fig. 55-14c
Decomposers
N2 in atmosphere
Nitrification
Nitrifying bacteria
Nitrifying bacteria
Denitrifying bacteria
Assimilation
NH3 NH4 NO2
NO3
+ –
–
Ammonification
Nitrogen-fixing soil bacteria
Nitrogen-fixing bacteria
E.)The)Phosphorus)Cycle)• Phosphorus is a major constituent of nucleic
acids, phospholipids, and ATP • Phosphate (PO4
3–) is the most important inorganic form of phosphorus
• Main reservoirs: sedimentary rocks of marine origin, the oceans, and organisms
• Phosphate binds with soil particles, and movement is often localized
51
Fig. 55-14d
Leaching
Consumption
Precipitation
Plant uptake of PO4
3– Soil
Sedimentation
Uptake
Plankton
Decomposition
Dissolved PO43–
Runoff
Geologic uplift
Weathering of rocks
AddiJonal)Notes)• Decomposers (detritivores) play a key role in
the general pattern of chemical cycling • Rates at which nutrients cycle in different
ecosystems vary greatly, mostly as a result of differing rates of decomposition
• The rate of decomposition is controlled by temperature, moisture, and nutrient availability
• Rapid decomposition results in relatively low levels of nutrients in the soil
53
CW#1. Finish)Ch.)55)Notes)Outline)!)pay)parJcular)
agenJon)to)human)impacts!))You)should)be)able)to)cite)specific)examples)in)an)essay)response))
2. Finish)the)Ch.)55)PracJce)FRQs)
54
Do9Now:)Group)Discussion)• Take)5)minutes)to)review)your)pracJce)FRQs)with)your)groups)))
• When)finished,)make)sure)your)planner)and)assignment)log)are)out))
• You)may)also)want)a)calculator)and/or)formula)sheet)out)for)your)test)
56
")AP)Bio)Exam)–)Monday,)May)11th)")• Meet)here)at)797:15am)for)breakfast)snacks))
• We)will)walk)down)together)at)7:40am))• No)cell)phones)allowed)in)tesJng)locaJon.))Cell)phone)=)dismissal)from)test))
• If)you)want)to)leave)anything)in)my)locked)cabinet,)you)can)bring)it)in)the)morning)
57
Shmoop)Leaders!)P.#2#Leaders# P.#4#Leaders#
Kirsten)514) Enrique)820)
Gloria)506) Melissa)Marquez)704)
KirsJ)498) Kailey)604)
Ms.#Fleming#582#
CW/HW)Assignments)18. )Unit)10)PracJce)FRQs))19. )AP)Bio)Grid9In)PracJce)Packet)))
PLANNER • Grid-in packet ! show all work so we can review next
class • Shmoop practice tests due • 500 shmoints