Transcript Interactions of Living Things

Interactions of Living Things
Carin Miranda
Smyrna Middle School
Biotic and Abiotic
Biotic-Living things such as mammals, fish,
birds and plants.
 Abiotic-Nonliving things such as water,
temperature, air, sunlight, dirt, rocks
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Organization in the Environment
Organism, population, community,
ecosystem, biosphere
 Population-members of one species in an
area.
 Community-several different populations
living together.
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Roles in the Environment
Producers-Organisms that can make their
own food from sunlight.Example:grass
 Consumers: Herbivores, carnivores, and
scavengers.
 Decomposers: Nature’s recyclers.
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Food Chain
Sun  Producers  Herbivores 
Carnivores  Scavengers
 Example: Grass is eaten by a rabbit, rabbit
is eaten by a Fox.
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Food Web
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In the picture the
arrow points to the
animal that is doing
the eating.
Looks like a web
Energy Pyramid
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Base of an energy
pyramid is represented
by producers.
Looks like a pyramid.
Limiting Factors and Carrying
Capacity
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Carrying capacity-The largest population an environment
can support.
After one species in an ecosystem disappears the other
species are thrown out of balance.
Limiting factors determine an area’s carrying capacity
because animals need resources to survive.
Resources such as water, food, sunlight, and space are
likely to be limiting factors when a population is
approaching the carrying capacity.
Fighting over food or nesting space is an example of
competition.
Predator Prey
The predator eats the prey is eaten.
 Prey adaptations include: camouflage,
chemical defenses, warning coloration, and
specialized behaviors.
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Symbiotic Relationships
Mutualism-both benefit Example coral and
algae
 Commensalism- one benefits one unaffected
Example Remoras and sharks
 Parasitism- one benefits one is harmed
Example wasps and tomato hornworm
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