Polar seastar on the move

Tube Feet
This seastar has four rows of small tube feet under each arm.
Moving
A seastar gets around by moving its suction feet.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A waved whelk on the move

Operculum
A waved whelk is a marine snail. The brown disk on its back is called an operculum. The whelk uses it to close off its shell and protect itself.
Foot
The muscles in its foot contract in waves, allowing it to glide along the film of transparent mucus that it secretes.
Tentacles
It uses its tentacles and eyes to explore its environment, and its siphon to breathe and detect odours.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A Sand Dollar on the Move

Feet
It uses the five rows of tube feet arranged in a star under its body to move about and burrow into the bottom to hide.
Burrowing
Sand dollars are hard to spot. They spend most of their time buried in the sand on the bottom, where they find food and shelter.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A sea cucumber on the move

That’s no vegetable!
A sea cucumber is not a vegetable, but a slow-moving marine animal.
Tube feet
It uses its tube feet to move around and anchor itself. Note how it contracts its body to help it move.
This sea cucumber is climbing up the wall of an aquarium, so you can see its four rows of tubular suction feet.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A northern sea anemone on the move

Animal or flower?
A northern sea anemone is an animal that looks like a large flower.
Tubular body
It has a series of vertical muscles that allow it to bend in every direction.
Pedal disk
To move, it stretches one side of its pedal disk and then contracts it. This shifts its centre of gravity in that direction.
Drifting
It can also drift with the current and attach itself wherever the current takes it..

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A blood seastar on the move

Exploring
Do you see how this tiny seastar moves about to explore its environment?.
For more information
For more information and to see how it is able to move so far, take a look at its larger cousin, the polar seastar, on the move.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A green sea urchin on the move

Spines
The spines on a sea urchin’s body, some of them short and some long, are able to move.
Feet
It contracts and expands its five double rows of tube feet to move around.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


A spider crab on the move

How many legs?
Like most crabs, a spider crab doesn’t swim, but uses its eight legs to move quickly across the bottom.
Pincers
Its pincers are modified legs that also help it get around.
Sideways movement
It tends to move sideways because of the shape and hardness of its shell and the arrangement of its legs.

Biodôme de Montréal

© Biodôme de Montréal, 2005. All rights reserved


Learning Objectives

The learner will:
  • Learn more about the ecosystems in the Americas;
  • Observe the diversity that each ecosystem offers regarding the flora, fauna as well as climate;
  • Identify the elements that shape different ecosystems, such as vegetation, wildlife, soil, etc.;
  • Develop different causes and consequences of human actions on ecosystems (from grade 4);
  • Formulate and justify possible solutions on issues, such as global warming, in order to preserve our ecosystems and biodiversity on Earth (from grade 6).

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