Community Interactions

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Community Interactions
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Community Interactions

• Community interactions, such as competition,
  predation, and various forms of symbiosis, can
  powerfully affect an ecosystem.

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• Competition when organisms attempt to use a
  resource at the same place and the same time.
• Predation when one organism captures and feeds
  on another organism.

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Symbiosis

• In a symbiotic relationship at least one of the
  organisms directly benefits from its close
  association with the other organism. There are
  three types of symbiosis.

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• Symbiotic Relationships

Parasitism
Mutualism
A symbiotic relationship where 1 organism
benefits and the other is harmed. Ex A tick
feeds on the blood of a dog
A symbiotic relationship where both organisms
benefit EX Cowbirds eat the bugs off of a cows
back
Symbiosis
A symbiotic relationship where 1 organism
benefits and the other is unaffected Ex When
cows walk through a field it stirs up bugs and
birds eat the bugs
Commensalism
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Commensalism

• One species benefits and the other gets no real
  benefit or harm.

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Commensalism
Bromiliad and tree the higher the bromiliad on
the branches, the more sun
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Commensalism
Shark and Remora remora eats food scraps from
sharks meals.
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Commensalism
Barnacles and Whale Barnacles are moved to
feeding grounds by riding on the whales.
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Mutualism

• Both species benefit from the relationship

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Mutualism
Clownfish gets protection and home Anemone gets
cleaned and brought food
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Mutualism
Eel gets cleaned by removal of parasites Shrimp
gets food
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Mutualism
Same as before
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Parasitism

• One species (the parasite) benefits, but in doing
  so, harms the other (the host).

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Parasitism
Mosquito takes blood for food Humans loss of
blood and possible infection
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Parasitism
Tick blood for food Mammal loss of blood and
possible infection
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Parasitism
Mistletoe takes nutrients from the tree. Tree
loss of nutrients and loss of leaves, possible
disease.