A Large-Scale Experiment on the Growth and Predation Potential of Ctenophore Populations
In reviewing the ecology of planktonic ctenophores, Walter (1976) pointed out how laboratory estimations of such parameters as growth, feeding and fecundity had been utilized to interpret population dynamics of ctenophores in the natural environment. In organisms with short life-cycles, which inhabit the water column, it is usually impossible to follow the growth and mortality characteristics of cohorts by the use of such techniques as size/frequency histograms. The observer can never be sure he is sampling the same population, over a period of time, and even if this were so, continuous breeding and rapid growth tend to quickly obscure the identification of distinct cohorts. It is also not possible to experimentally manipulate the population. This report describes an experiment in which plankton populations were studied in three containers for six weeks following empoundment of a water column and its natural plankton assemblage.
KeywordsPredation Potential Planktonic Copepod Phytoplankton Standing Crop Saanich Inlet Size Frequency Histogram
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- Hirota, J., 1972. Laboratory culture and metabolism of the planktonic ctenophore, Pleurobrachia bachei A. Agassiz. Pages 465–484 in A. Y. Takenouti et al., Eds., Biological Oceanography of the Northern North Pacific Ocean. Idemitsu Shoten, Tokyo, 626 pp.Google Scholar
- Hirota, J., 1974. Quantitative natural history of Pleurobrachia bachei in La Jolla Bight. Fish. Bull. U. S. 72: 295–335.Google Scholar
- Kremer, P. M., 1975. The ecology of the ctenophore, Mnemiopsis leidyi in Narragansett Bay. Ph.D. dissertation, University of Rhode Island.Google Scholar
- Paffenhöfer, G-A. and R. P. Harris, 1976. Feeding, growth and reproduction of the planktonic copepod Pseudocalanus elongatus Boeck. J. Mar. Biol. Ass. U. K. (In press).Google Scholar
- Reeve, M. R. and L. D. Baker, 1975. Production of two planktonic carnivores (chaetognath and ctenophore) in south Florida inshore waters. Fish. Bull. U. S. 73 238–248.Google Scholar
- Reeve, M. R., J. C. Gamble and M. A. Walter, 1976. The behavior of copepods and other zooplankton in copper contaminated enclosed water columns. Bull. Mar. Sci. 26: (In press).Google Scholar
- Takahashi, M., W. H. Thomas, D. L. R. Seibert, J. Beers, P. Koeller and T. R. Parsons, 1975. The replication of events in enclosed water columns. Arch. Hydrobiol. 76: 5–23.Google Scholar