The release of dissolved organic carbon as a result of diatom fragmentation during feeding by Mysis relicta
The release of dissolved organic carbon (DOC) by Mysis relicta that occurs while feeding may be an important pathway in the recycling of nutrients in Lake Michigan. Laboratory experiments were conducted to determine the levels of DOC released by M. relicta from Lake Michigan while grazing on laboratory-cultured diatoms. Increasing filtering rates were observed at progressively lower chlorophyll concentrations. Higher filtering rates were accompanied by higher fragmentation of diatoms and a higher concomitant release of DOC from broken cells. While the amount of DOC release is small (0.02−3.30 μg C·1−1 · h−1), it nonetheless is of importance to bacteria and possibly some algae. After assimilation by bacteria and algae, the organic carbon is then available to consumers.
KeywordsMysidacea Mysis relicta dissolved organic carbon fragmentation grazing recycling
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- Cannon, H. G., Manton, S. M., 1927. On the feeding mechanisms of a mysid crustacean, Hemimysis lamornae. Trans r. Soc. Edinb. 55: 219–253.Google Scholar
- Conover, R. J., 1966. Feeding on large particles by Calanus hyperboreus (Kroyer). In: Barnes, H. (Ed.) Some Contemporary Studies in Marine Science, pp. 187–194. Allen, Unwin.Google Scholar
- Grossnickle, N. E., 1978. The herbivorous and predaceous habits of Mysis relicta in Lake Michigan. Ph.D. thesis, Univ. Wisconsin-Madison. 107 pp.Google Scholar
- Guillard, R. R. L., 1975. Culture of phytoplankton for feeding marine invertebrates. In: Smith, W. L., Chanley, M. H. (Eds) pp. 29–56. Plenum, New York.Google Scholar
- Hobbie, J. E., Wright, R. T., 1965. Competition between planktonic algae and bacteria for organic solutes. Mem. 1st. ital. Idrobiol., Suppl. 18: 175–185.Google Scholar
- Madeira, P. T., 1978. Excretion of total phosphorus, dissolved reactive phosphorus, ammonia, and urea by Lake Michigan Mysis relicta. M.S. thesis, Univ. Wisconsin-Milwaukee. 67 pp.Google Scholar
- Nalewajko, C., Lee, K., Fay, P., 1980. Significance of algal extracellular products to bacteria in lakes and cultures. Microb. Ecol. 6: 199–207.Google Scholar
- Richards, R. C., Goldman, C. R., Frantz, T. C., Wickwire, R., 1975. Where have all the Daphnia gone? The decline of a major cladoceran in Lake Tahoe. Verh. int. Verein. Limnol. 19: 835–842.Google Scholar
- Sheldon, R. W., Parsons, T. R., 1967. A practical manual on the use of the Coulter counter in marine science. Coulter Electronics, Inc., Toronto, Ontario.Google Scholar
- Strickland, J. D. H., Parsons, T. R., 1972. A Practical Handbook of Seawater Analysis. Bull. Fish. Res. Bd Canada 167 (2nd edn.).Google Scholar
- Vande Castle, J. R., 1979. A study of the seasonal development and diurnal variation of the chlorophyll a maximum in Lake Michigan. M.S. thesis, Univ. Wisconsin-Milwaukee. 115 pp.Google Scholar