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12AInterpret relationships (predation, parasitism,
commensalism, mutualism, competition) among organisms
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An organisms role in its environment…
• An organisms habitat is the area where it lives.
• In any environment, every species fills a unique niche.
• A niche includes the conditions and resources a species’ needs for survival and how it obtains these resources.
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Relationships between Organisms
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COM
PETI
TIO
N THE DEMAND BY TWO OR MORE ORGANISMS FOR LIMITED RESOURCES
SUCH AS FOOD, WATER OR SHELTER
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PRED
ATIO
N INTERACTION IN WHICH ONE ORGANISM CAPTURES AND FEEDS
ON ANOTHER ORGANISM
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PREDATOR•LION• THE ORGANISM
CAPTURING AND FEEDING ON ANOTHER ORGANISM (THE PREY)
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PREY•HIPPO• ORGANISM
BEING EATEN
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PARA
SITI
SMSYMBIOTIC RELATIONSHIP IN WHICH ONE
ORGANISM LIVES IN OR ON ANOTHER ORGANISM & CAUSES IT HARM
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PARASITE•TICK• ORGANISM
LIVING IN OR ON ANOTHER ORGANISM CAUSING IT HARM
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HOST•DOG• ORGANISM
BEING HARMED BY PARASITE
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COM
MEN
SALI
SM SYMBIOTIC RELATIONSHIP IN WHICH ONE ORGANISM BENEFITS & ANOTHER
ORGANISM IS NEITHER HARMED NOR BENEFITS
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Whale & Barnacle
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Egrets & Cattle
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MU
TUAL
ISM SYMBIOTIC RELATIONSHIP IN WHICH
BOTH ORGANISMS BENEFIT
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Clown Fish & Anemone
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12CAnalyze the flow of matter & E
through trophic levels using various models (food webs, food chains, and ecological
pyramids).
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AUTOTROPH• aka PRODUCER • an organism that captures E from
sunlight or chemicals & use it to produce its own food
ex: most plants
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HETEROTROPH• aka CONSUMER • an organism that obtains E from the
food it consumesex: humans, snakes, rhino, jaguar
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PRIMARY CONSUMER
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SECONDARY CONSUMER
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TERTIARY CONSUMER
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QUATERNARY CONSUMER
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HERBIVORE• Organism that obtains E from eating
plants
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OMNIVORE• Organism that obtains E by eating
both plants & animals
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CARNIVORE• Organism that obtains E by eating
animals
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DETRITIVORE• aka DECOMPOSER• Organism that feeds on dead plant &
animal material & other dead matter
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SCAVENGER• Animals that eat dead animalsEx: Vultures, Tasmanian devils
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FOOD CHAIN • the sequence of who eats whom in a
biological community (an ecosystem) to obtain nutrition. • starts with the primary energy
source• Ends with the top predator
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FOOD CHAINQuaternary consumer
Tertiary consumer
Secondary consumer
Primary consumerProducer
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FOOD WEB• Let’s put some food chains
together…
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Label the organisms in your notes.*organisms
can have more than 1
label.
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ECOLOGICAL PYRAMID• Represents the producers and
consumers in an ecosystem in a pyramid shaped-diagram.
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Where does all E come from?
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As you go up trophic levels, 10% of Energy is lost. Why?
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Most of the E is available at what level?
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Biological Magnification
the increasing concentration of toxic substances within each successive
link in the food chain
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As you go up trophic levels, the number contaminants increases.
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Fill in the boxes with
dots to represent the
toxic contaminant.
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Do your boxes look like this?