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Sponges
are composed of a number of different kinds of cells, connective structures,
and water canals. Some cells, called choanocytes, line the canals and have
hair-like structures called flagella. By moving the flagella, the cells allow
water to sucked through tiny holes in the porous colony, into larger canals,
and send it shooting out through large holes. It’s hard to see with the naked
eye, but add some dye to the water surrounding the sponge and your senses are
in for a feast!
Sponges are suspension feeders that use flagellated collar-cells (choanocytes) to actively filter a volume of water equivalent to many times their body volume each hour. Flow through sponges is thought to be enhanced by ambient current, which induces a pressure gradient across the sponge wall, but the underlying mechanism is still unknown.
Video source:
Jonathan Bird's Blue World: Sponges!
Paper:
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0027787
Sponges are suspension feeders that use flagellated collar-cells (choanocytes) to actively filter a volume of water equivalent to many times their body volume each hour. Flow through sponges is thought to be enhanced by ambient current, which induces a pressure gradient across the sponge wall, but the underlying mechanism is still unknown.
Video source:
Jonathan Bird's Blue World: Sponges!
Paper:
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0027787
corina marinescu
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