. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PARTICLE SORTING IN THE OYSTER 5 masses are invariably carried to the free margins. Mucus entering the terminal grooves to reach the mouth must perform a turn of around 180°. The thick layers of mucus are unable to do this and fall off the ctenidium onto the inner mantle margins where they are rejected as pseudofeces; this separation of unwanted mucus is aided by the activity of the lateral groove cilia. It is highly probable then that two distinct mucus types are concerned with the entrapment and rejection of particles whil
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PARTICLE SORTING IN THE OYSTER 5 masses are invariably carried to the free margins. Mucus entering the terminal grooves to reach the mouth must perform a turn of around 180°. The thick layers of mucus are unable to do this and fall off the ctenidium onto the inner mantle margins where they are rejected as pseudofeces; this separation of unwanted mucus is aided by the activity of the lateral groove cilia. It is highly probable then that two distinct mucus types are concerned with the entrapment and rejection of particles while gravimetric settlement in the inhalant chamber readily accounts for segregation of organic from inorganic particles, such as the report by Allen (1921) noting separation of a blue-green alga from coarser materials. inon 100 - E E LJ > UJ 5 UJ _i h- h- LJ CO o o. 4 6 10 50 100 PARTICLE DIAM (fi) LOG SCALE FIGURE 2. Relationship of settling velocity to particle size assuming g. specific gravity Ordinate 18 is the maximum inhalant pallial velocity for an 8 cm Pacific oyster. There are a number of reports dealing with separation between various organic forms such as yeasts and algae or algae and bacteria. The central prop to these observations is the report by Loosanoff (1949) that C. virginica is able to segregate purple sulphur bacteria from algae. As resolution of this point is central to a better understanding of oyster nutrition, Loosanoff's (1949) experiments were repeated using two genera of chromatophoric bacteria. The autotroph Chromatium warmingii is probably identical with the species used by Loosanoff and the other species, a heterotroph, Chromabacterium cf amethystinum was also Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
