Effects of calcium and salinity on the growth rate of Ephydatia fluviatilis (Porifera: Spongillidae) |
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| Authors: | J. C. Francis M. A. Poirrier R. A. LaBiche |
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| Affiliation: | (1) Department of Biological Sciences, University of New Orleans, 70122 New Orleans, LA, U.S.A. |
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| Abstract: | The freshwater sponge, Ephydatia fluviatilis (Porifera: Spongillidae), was maintained in a continuous-flow laboratory culture system under several conditions of calcium ion (Ca++) concentration and salinity. Experimental results suggest that sponge growth rate increases with increasing Ca++ concentration, that sponge growth rate decreases with increasing salinity, and that the negative effect of higher salinity can be overcome by increasing Ca++ concentration. The experimental results correlate well with field observations on the effects of salinity and Ca++ on the distribution of E. fluviatilis. |
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| Keywords: | continuous culture freshwater sponge Ephydatia fluviatilis |
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