Abstract
The vegetative growth and turion formation of Potamogeton crispus, a submersed aquatic macrophyte, was investigated under a range of phosphorus (P) concentrations (0.025, 0.25, 2.5 and 25 mg P L−1) in the ambient water free of algae, aiming to identify the responses of submersed aquatic macrophytes to nutrient enrichment, a common eutrophication problem in China and worldwide. Plant growth was not affected by different P concentrations in terms of biomass accumulation of stems and leaves. However, the contents of chlorophyll a and starch in plants decreased with increasing water P levels, whereas chlorophyll b and carotenoids declined with P level ranging from 0.025 to 2.5 mg P L−1. The soluble sugar content decreased when water P concentration increased up to 2.5 mg L−1. The P content in plants increased with increasing water P levels, whereas plant N content decreased and soluble protein increased when water P concentration increased over 0.25 mg L−1, implying that P. crispus may have modified its metabolism to adapt to water P availability. When P concentration increased to 25 mg L−1, the number and dry matter production of turions per plant decreased significantly. Meanwhile, there was a significant reduction in turion weight and the accumulations of soluble sugar and starch in turion, when water P concentration was over 0.25 mg L−1. The results suggest that turion formation in P. crispus is sensitive to P concentration in the ambient water, and high P levels may lead to decreases in P. crispus populations due to the decline in turion production.
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Acknowledgments
We thank the National Natural Science Foundation of China (40973056) and the Natural Science Foundation of Hubei Province (2005ABA042) for financial support; Assoc. Prof. Anguo Liu for meteorological data; Assoc. Prof. Bo Qu for statistical analysis. This work was part of the Research and Demonstration on Agro-Ecological Restoration Technology in Danjiangkou Reservoir Region for the South-to-North Water Transfer Project (Grant No. 2007BAD87B09).
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Wang, L., Yang, T., Zhu, D. et al. Growth and turion formation of Potamogeton crispus in response to different phosphorus concentrations in water. Aquat Ecol 47, 87–97 (2013). https://doi.org/10.1007/s10452-012-9427-7
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DOI: https://doi.org/10.1007/s10452-012-9427-7