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 Symbiosis Objective: To understand the relationships between species that allows them to survive.

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Presentation on theme: " Symbiosis Objective: To understand the relationships between species that allows them to survive."— Presentation transcript:

1  Symbiosis Objective: To understand the relationships between species that allows them to survive.

2 Symbiosis  Means ‘living together’; a partnership  Explains the close relationship between two species that allows them to ‘live together’ in order to survive  ‘Inter-specific’: means that it occurs between different species

3 Why live together?  Due to competition for food and territory  Animals try to avoid direct competition and form a stable relationship (other than the predator-prey relationship)  Sharing of space and/or food supply

4 Animal kingdom  Nile crocodile & crocodile bird  Hermit crab & sea anemone  Buffalo & oxpecker  Shark & remora fish

5 Crocodile & bird  Nile crocodile  Usually eats animals  Allows bird to walk around its mouth  Crocodile bird  Cleans parasites in croc ’ s teeth  Removes and eats scraps of food  Eats harmful leeches and parasites

6 Hermit crab & sea anemone  Hermit crab  protects the crab  Sea anemone  Gets leftover food

7 Buffalo & oxpecker  Buffalo  Lets the bird eat  Oxpecker  Eats ticks and other parasites off skin  Warns buffalo of danger

8 Shark & remora fish  Shark  Lets the fish eat  Remora Fish  Eats parasites  Gets the shark’s leftovers

9 3 categories of symbiotic interrelationships: Both species benefit from the association. Mutualism When one species benefits from the association and the other is unharmed. Commensalism An interaction where one species lives in/on the host; the host is often harmed. Parasitism

10 Mutualism  Both species benefit  Neither can survive without the other  Examples  Tickbirds and rhinos  Flowers and bees

11 Commensalism  “ eating together at the same table ”  Only one member benefits  sharing space, defense, shelter, food  Neither will die if relationship is ended  E.g. Pearlfish & sea cucumber

12 Parasitism  Not symbiotic  Causes harm to host  E.g. Fleas living off a dog


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