. The Biological bulletin. Biology; Zoology; Marine biology. MARINE BACTERIA AND LIFE CYCLE IN SEA 65 synthesis. These two considerations may fully account for the greater decomposition of the plankton in the mud than in the water, as measured by the C02 evolution, not accompanied, however, by greater ammonia liberation. Decomposition of Marine Aixle by Bacteria The decomposition of the algal material by bacteria was carried out in a manner similar to that of the plankton. The period of decomposi- tion was 26 days for the Ulva and 28 days for the Fucus. One-gram quantities of the air-dry mater
. The Biological bulletin. Biology; Zoology; Marine biology. MARINE BACTERIA AND LIFE CYCLE IN SEA 65 synthesis. These two considerations may fully account for the greater decomposition of the plankton in the mud than in the water, as measured by the C02 evolution, not accompanied, however, by greater ammonia liberation. Decomposition of Marine Aixle by Bacteria The decomposition of the algal material by bacteria was carried out in a manner similar to that of the plankton. The period of decomposi- tion was 26 days for the Ulva and 28 days for the Fucus. One-gram quantities of the air-dry material of F. vesiculosus and U. lactuca were added to the flasks containing the water as a medium or the mud and water; the cultures were aerated daily. The results presented in Table IV and Fig. 3 show that the Ulva was decomposed by the bacteria in the water and in the mud more actively than the Fucus. In the case of the Ulva there was very little difference in the rate of decomposition in the water or in the mud; the WATER CULTURE + ULVA MUD CULTURE t ULVA MUD CULTURE + FUCUS WATER CULTURE + FUCUS MUD ALONE WATER ALONE. DAYS OF DECOMPOSITION Fig. 3. Course of evolution of C02 in the decomposition of marine algse in sea water and in marine mud. Fucus, however, showed a very marked difference, since a considerably greater amount of C02 was liberated in the mud than in the water cul- tures. About 4 to 5 milligrams of ammonia-nitrogen were accumulated in the decomposition of the Ulva, while there was no ammonia at all or only a mere trace in the Fucus cultures. The nitrogen content of the two algae offers the explanation for this difference. Ulva contained per cent nitrogen on a total dry, ash and salt-free basis; Fucus, however, contained only per cent nitrogen, on an ash and salt-free basis. 6. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
