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Lecture 35

BIOLOGY 1M03 Lecture Notes - Lecture 35: DecomposerPremium


Department
Biology
Course Code
BIOLOGY 1M03
Professor
Jon Stone
Lecture
35

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BIOLOGY1M03Lecture35Ecosystems
KeyConcepts:
● Anecosystemhas4components
○ Abioticenvironment
○ Primaryproducers
○ Consumers
○ Decomposers
○ Thesecomponentsarelinkedbythemovementofenergyand
nutrients
● Asenergyflowsfromproducerstoconsumersanddecomposersinafood
web,muchofitislost.
○ Theproductivityofterrestrialecosystemsislimitedbywarmthand
moisture;nutrientavailabilityisthekeyconstraintinaquatic
ecosystems.
● Toanalyzenutrientcycles,biologistsfocusonthenatureofthereservoirs
whereelementsresideandtheprocessesthatmoveelementsbetween
reservoirs.
○ Nutrientadditionbyhumansisincreasingproductivityandcausing
pollution.
● Theburningoffossilfuelshasledtorapidclimatechange;rapidecological
andevolutionarychangesarebeingobservedinresponse.
EnergyFlow:
● Asenergyflowsfromproducerstoconsumersanddecomposersinafood
web,muchofitislost.Theproductivityofterrestrialecosystemsislimitedby
warmthandmoisture;nutrientavailabilityisthekeyconstraintinaquatic
ecosystems.
● Organismsthatacquireenergyfromthesametypeofsourcearesaidto
occupythesametrophiclevel.
○ Becauseenergytransferfromonetrophicleveltothenextis
inefficient,ecosystemshaveapyramidofproductivity
○ Biomassproductionishighestatthelowesttrophiclevelandlowerat
eachhighertrophiclevel.
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