JC010: Mud volcanoes and submarine canyons


 JC10



Cruise diary


Day 15: Thursday 5 July 2007
Position: In transit
Weather: Sunny with light cloud


Tina writes:

"On almost our last day at sea I thought I would test your knowledge.  The photos below were taken at depths of between 1000m and 4300m.  All you have to do is decide which are animals and which are plants...Easy!"


Did you get them right???  CLICK HERE to find out.







































The answers....

They are all animals.  No light penetrates the ocean below 150m so no plants can survive at depths below this. Plants produce their own food using chlorophyll in a process called photosynthesis.  Without light plants can no photosynthesis and so cannot live.  The only reason you can see the animals here is because the ROV has very powerful lights.

But how do some of them feed?

Number 7 and 9 , are a deep water coral and a gorgonian, they feed using polyps.  These are circular structures with a mouth in the middle around the mouth are tentacles.  When a food particle touches a tentacle, the tentacle puts the food particle into the mouth.  

Numbers  1, a crinoid and 11and 5 are brisingids (all are related to star fish) have tube feet running along their arms and the tube feet pass particles from one to another and into the mouth.

Number 10, a sea urchin, also has tube feet but it has teeth as well so the teeth can crunch larger animal particles.

Number 3, an octopus, has a beak (like a birds beak) under the head.  The beak is very strong and its favourite food is crab, which it crushes into little bits.

Number 12, a stalked sponge, has cilia (small moving hairs) which create a water current and food particles are swept across the cells which take them out of the water and digest them.

Number 6, a crab, uses its large pincers to sort through the mud.  When it finds an animal living in the mud it passes it to smaller pincers by its mouth holding the food while it bites chunks off.

Number 4, a seabed dwelling fish, eat animals it finds on the sea floor with its mouth.

Number 8, a sea spider, although it looks like a spider it is not, and it does not make a spiders web! The sea spider has a mouth captures animals to eat.

Number 2, is two animals, and I have not been able to identify them from this picture.


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