Abstract
In the laboratory we examined the effect of pH (5–10 with one interval) on survival, reproduction, egg viability and growth rate (intrinsic growth rate—r m and population growth rate—r) of five Brachionus rotifer species (B. calyciflorus, B. quadridentatus, B. urceolaris, B. patulus and B. angularis). The pH was shown to exert a major influence on egg viability and growth rate (r m and r) for each species. The age-specific survivorship curves within a species were not significantly different at pH 6–10. The optimal pH for each species is near-neutral pH (pH 6–8), and the fecundity decreased as the pH deviated from these values. For each Brachionus species, there was no significant difference between age-specific fecundity curves at pH 7 and 8. At acid pH (pH 5 or 6) higher egg mortality was observed for each species. The r m and population r of the five Brachionus species incubated at different pHs were significantly influenced by pH. The pH supporting the highest r m or r was obtained at pH 6–8, but varied due to species. In this study B. urceolaris and B. patulus could tolerate a broad range of pH, while the populations of B. calyciflorus, B. quadridentatus and B. angulari declined at acid conditions.
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Acknowledgments
We thank four anonymous referees for constructive comments on the manuscript. We also thank X.X. Chen for technical assistance during the investigation. This study was supported by the National Natural Science Foundation of China (no. 30470309).
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Yin, X.W., Niu, C.J. Effect of pH on survival, reproduction, egg viability and growth rate of five closely related rotifer species. Aquat Ecol 42, 607–616 (2008). https://doi.org/10.1007/s10452-007-9136-9
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DOI: https://doi.org/10.1007/s10452-007-9136-9