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Do Now. 1. Arctic foxes live in very cold climates. Which of the following is a biotic factor that may impact them? a) Cold temperatures b) Heavy snow c) Strong wind d) Number of lemmings (their prey )

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Do Now

1. Arctic foxes live in very cold climates. Which of the following is a biotic factor that may impact them?

a) Cold temperatures

b) Heavy snow

c) Strong wind

d) Number of lemmings (their prey)

2. You discover a group of oxen and birds that live in the same area. This is an example of a(n)

a) ecosystem

b) biosphere

c) population

d) biological community

3. Think about friendship. What are some benefits that you get from friendships?


Unit 9: EcologyHow do living things Interact with their surroundings?


Today’s Objectives

  • SWBAT differentiate between different forms of symbiotic relationships


Video 1: Giraffes & Oxpeckershttp://animal.discovery.com/tv-shows/animal-planet-presents/videos/top-10-odd-animal-couples-the-giraffes-oxpecker.htm

  • Video is not embedded; use the link above


Video 1: Giraffes & Oxpeckers

  • How did the relationship between the two organisms help the giraffe?

  • How did the relationship between the two organisms help the bird?

They have harmful ticks removed.

They get a free meal!


Symbiotic relationships (Symbiosis)

What are they?

When two different species live closely together


Symbiotic relationships (Symbiosis)

Three types of symbiosis:

  • Mutualism

  • Commensalism

  • Parasitism


Mutualism

What is it?

An interaction between two species that benefits both.

(“win-win”)


Mutualism

Example: Flowers and insects

The insects help

spread pollen to

make new plants.

The flowers give

the insects food


Commensalism

What is it?

An interaction between species that benefits one and does not harm the other.

Yay! I don’t mind!


Commensalism

Example:

The remora fish

and a shark

The remora fish suctions on to the shark for a free ride.

The shark doesn’t mind!


Parasitism

What is it?

One organism benefits but the other organism is harmed.

Alright! Boooo!


Parasitism

Example:

Mistletoe and Trees

Mistletoe is a plant that latches on to trees and steals food from them. The mistletoe benefits, but the tree is harmed.


>> Check for understanding

Looking back at the video, what type of symbiotic relationship are the giraffe and the oxpecker in? Explain.

Mutualism, because BOTH organisms benefit!


Predation: NOT a symbiotic relationship!

Predation is when a predator seeks out and eats another organism (called a prey)

Don’t get confused with parasitism


Video 2: The tongue-bitershttp://animal.discovery.com/tv-shows/animal-planet-presents/videos/top-10-odd-animal-couples-the-giraffes-oxpecker.htm

  • Video is on the Animal Planet website


Video 2: The tongue-biters

  • What type of symbiotic relationship do the snapper and the “tongue biter” have? How do you know?

  • What type of symbiotic relationship do you have with the bacteria in your mouth? How do you know?

Parasitism, because one organism (the tongue-biter) benefits, while the other is harmed

Mutualism, because you both benefit!


Exploring symbiosis

With your group, go to each station and decide what type of symbiotic relationship exists in each situation

You have 90 seconds to decide!


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