Interactions Among living Things

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Interactions Among living Things
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DO NOWCopy these vocab words into your notes
packet.

• prey
• symbiosis
• mutualism
• commensalisms
• Parasitism
• Parasite
• host

Natural Selection Adaptation Niche
competition predation Predator
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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

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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

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ON pg 26, compare and contrast the three
different birds and their niches.
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What are the types of interactions that occur in
an ecosystem?
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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

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??? How is it that trees and grass complete?

• Sunlight, water, minerals, space

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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

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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

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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.

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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.

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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

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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

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Todays Do Now

• Get a book
• Take out you packet and turn to the vocabulary
  page.
• Be sure you are ready to begin class.

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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
• Doesnt usually kill host
• Example- flees, ticks, worms
• Go back to picture on pg 30. A tick would be an
  example of parasite to hippo.

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Review

• What are adaptations
• Behaviors and characteristics that help organism
  be successful
• How are a snakes 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

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