These stringy clumps of mucus, basically the equivalent of sea sponge snot, were then expelled into the water column by a series of contractions and relaxations across the sponges’ surface. In fact they spend their lives attached to the a fixed substratum through roots like. These highways became junctions at specific elevated sections on the sponges' surface with the mucus forming stringy clumps. The video also shows that mucus is continually moving across the surface of the sea sponge, creating “mucus highways” that contain waste material. In the video, the sponge can be seen expelling particulate matter through its inlet pores. They are stuck to the floor in the oceans, seas, and even rivers and most of them feed on bacteria and other food particles that they capture in the water. Researchers recorded a time-lapse video of the stove-pipe sponge ( Aplysina archeri). Sponges that reproduce asexually produce buds or, more often, gemmules, which are packets of several cells of various types inside a protective covering. These sponges move mucus, containing waste particles, against their internal flow of water out of their ostia and into the surrounding water column by a period of surface contractions – or “sneezing”. While marine experts have known about this behavior for a long time, new research published in the journal Current Biology has revealed a new waste disposal system.
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