Sea Urchins role in the ecosystem is to provide a canopy habitat for larval, juvinile and some adult fish and invertebrates to hide and grow under until they are large enough to emerge safely. Sea Urchins are algae and detritis eaters which keep a balance in the benthic habitat by grazing on which if left can cause spikes in bacteria levels or in the case of coral reefs can smother coral. They move around and clean up the bottom. Lastly Sea Urchins are a food source for humans, fish and other animals. Sea Urchins can very easily overpopulate and if they do can wreak havoc in large areas in the ecosystem, particularly inside of Marine Reserves. Little is known about this phenomena of Sea Urchin Barrens other than that they can last for decades until a disease hits and there is a mass die off. In California, habitat restoration efforts are underway to eradicate these Sea Urchin Barrens or Urchin Dominated Areas by Santa Monica Baykeeper and the Orange County Baykeeper. It seems ironic that they would advocate for Marine Reserves in the MLPA process which in effect causes Sea Urchin Barrens that contradicts their efforts to restore the habitat that they have or about to destroy. Look on u tube for the Baykeepers videos and also for other sea urchin barrens videos.
they are most common in shallow waters.
bottom of the sea
The only problem that the sea anemone encounters in its habitat, aside from predators, is pollution. Pollution interferes with both reproduction and the exchange of oxygen.
how did the sea urchin became endengered
It urges the sea to adapt to IT! The litle urchin urger.
Water.
If I knew this question I wouldn't be asking it!
The classification of a Sea Urchin is Echinoidea
sea urchin
A sea urchin does move, but not very frequently.
because the crab needs the sea urchin for protection and the sea urchin needs the crab for food
Ummm...it's the thing from which a sea urchin hatches?
I think a sea anenome and a sea urchin can live together because i have a little aquarium and there is a sea urchin and and a sea anenome (if that's how you spell it) living in there and they were perfectly fine. BUT if you have a sea urchin do not have any crabs in there, because my sea urchin killed one, and almost killed another one by taking its claw off. :(
a blue tuxedo sea urchin
Spines of the sea urchin can cause injuries of the skin.
Micro and macroalgae ranging from the common micro green or brown slime algae to the macro gracilea.