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Transcript
Interactions Among living
Things
DO NOW:
Copy these vocab words into your notes
packet.
Natural Selection
Adaptation
Niche
competition
predation
Predator
prey
symbiosis
mutualism
commensalisms
Parasitism
Parasite
host
Natural selection
• Remember natural selection- individuals
better suited for environment will survive
and reproduce
• Adaptations- the behaviors and physical
features that allow organisms to live
successfully in their environment
Niche
• Every organism has a variety of
adaptations that are suited to its specific
living conditions
• Niche- role of an organism in its habitat or
how it makes its living
– Type of food
– How it gets food
– How other organism use it as food
– How it reproduces
ON pg 26, compare and contrast
the three different birds and their
niches.
What are the types of
interactions that occur in an
ecosystem?
competition
There are three major types of interactions
among organism; competition, predation,
and symbiosis
Competition - It is a struggle between
organism to survive with the same limited
resources
Many organisms compete for food, water,
shelter, mates
??? How is it that trees and grass
complete?
• Sunlight, water, minerals, space
predation
• Predation - The interaction where one
organism kills another for food
• Predator- one that does the killing
• Prey- one that is eaten
• If an increase in predators, what will
happen?
– Prey population will decrease- lower food
supply will cause the predator population to
decrease
Pg 27 math analyzing data
• Take out your packet and turn to last nights homework.
• Answers:
• 1. No. It looks like the population of birds went down when the
population of rattlesnakes declined.
• 2. Yes, The number of rodents rose as the number of snakes
declined.
• 3. Rodents I can tell because when the population of snakes was
steady, the population of rodents was steady (there was a balance)
but with snakes out of the way, the rodent population grew.
• 4. Because the rattlesnake was the biggest preditor on the birds.
With them out of the way, the bird population could grow.
• 5. Answers will vary
Predator and Prey Adaptations
Predators- help kill prey
speed, tentacles
Prey- avoid being killed
mimicry- looking like something else that is
dangerous
false coloring- looks like something bigger
protective covering- porcupine
camouflage- chameleon, walking leaf insect
warning colors- certain colors often are warning
of poisonous.
symbiosis
• A close relationship between two species
that benefits at least one of the species
• The three types of symbiotic relationships
are mutualism, commensalisms and
parasitism.
Mutualism
• Both species benefit
• Some species could not survive without
the other
• Pg 30. read caption on figure 17
– Why are these birds sitting on the hippo?
• To feed and hitch a ride
commensalism
• One species benefits and other is neither
helped or harmed
• some birds with trees- birds have home
and the tree is neither helped or harmed
• Hawk and cactus
• Your bugs-- tiny mites(demodex
folliculorum) live on the base of eyelashes
and live on dead skin
Today’s Do Now
• Get a book
• Take out you packet and turn to the
vocabulary page.
• Be sure you are ready to begin class.
parasitism
• Parasit - One organism living in or on
another organism causing it harm
• Host- provides the home and food for the
parasite
• Parasite usually smaller than host
• Doesn’t usually kill host
• Example- flees, ticks, worms
• Go back to picture on pg 30. A tick would
be an example of parasite to hippo.
Review
• What are adaptations
– Behaviors and characteristics that help organism be
successful
• How are a snake’s sharp fangs and adaptation?
– Enable the snake to bit into its prey
• What are the three main ways in which
organisms interact?
– Competition, predation, symbiosis
– Watch Discovery Educations Life: Hunters and
Hunted