Urchins

Some articles on urchin, urchins:

Meoma Ventricosa - Biology
... The red heart urchin feeds on these films by swallowing sediment while it burrows under the surface of the substrate ... The urchin's growth rate is slow as it is limited both by the amount of organic material that can be extracted in this way and also by the lack of oxygen in ... To overcome this limitation, adult urchins often emerge onto the seabed at night and burrow down into the sediment again next day while juveniles remain permanently buried ...
Sea Urchin - Ecology
... Sea urchins feed mainly on algae, but can also feed on sea cucumbers and a wide range of invertebrates, such as mussels, polychaetes, sponges, brittle stars and crinoids ... The shingle urchin (Colobocentrotus atratus), which lives on exposed shorelines, is particularly resistant to wave action ... Sea urchins are some of the favorite foods of sea otters, and are also the main source of nutrition for wolf eels ...
Diadema Antillarum - Research On Re-population of The Species
... The urchins can be grown in laboratories and then relocated ... mature individuals into the wild can have a positive effect on the urchin density of the reef ... growth of coral, and provide more niches for the urchins to hide from predators such as larger fish ...
Modern History Of Durrus And District - Fishing - Sea Urchin Fishery 1960s To 1980s
... There was a thriving fishery in sea urchins in Dunmanus Bay, in the area bounded by Mannion's Island Ahakista and the ruined Dunmanus Castle ... The waters are shallow and this encouraged the growth of the urchins ... The urchins were picked from the seabed by divers and John Arthur said that they would often spend four hours in the water ...
Sea Urchin - Relation To Humans - In Biology
... Sea urchins are traditional model organisms in developmental biology ... Sea urchins were the first species in which sperm cells were proven to fertilize ova ... The recent sequencing of the sea urchin genome established homology between sea urchin and vertebrate immune system-related genes ...