Abstract
Bacterioplankton are important components of freshwater ecosystems and play essential roles in ecological functions and processes; however, little is known about their geographical distribution and the factors influencing their ecology, especially in stream ecosystems. To examine how geographical and environmental factors affect the composition of bacterioplankton communities, we used denaturing gradient gel electrophoresis and clone sequencing to survey bacterioplankton communities in 31 samples of streamwater from seven nature reserves in Fujian province, southeast China. Our results revealed that dominant bacterioplankton communities exhibited a distinct geographical pattern. Further, we provided evidence for distance decay relationships in bacterioplankton community similarity and found similar community gradients in response to elevation and latitude. Both redundancy analyses and Mantel tests showed that bacterioplankton community composition was significantly correlated with both environmental (electrical conductivity, total phosphorus, and PO4-P) and geographical factors (latitude, longitude, and elevation). Variance partitioning further showed that the joint effect of geographical and environmental factors explained the largest proportion of the variation in distribution of bacterioplankton communities (13.6 %), followed by purely geographical factors (11.2 %), and purely environmental factors (0.6 %). The Betaproteobacteria were the most common taxa in the streams, followed by Firmicutes and Gammaproteobacteria. Therefore, our results suggest that the biogeographical patterns of stream bacterioplankton communities across the Fujian nature reserves are more influenced by geographical factors than by local physicochemical properties.
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Acknowledgments
We thank Dr. Hongqu Tang for assistance in field sampling, and Mr. Huihuang Chen and Ms. Xiaoqing Yu for support in nutrient analysis. This study was financed by the International Science and Technology Cooperation Program of China (2011DFB91710), the Natural Science Foundation for Distinguished Young Scholars of Fujian Province (2012 J06009), and the National Natural Science Foundation of China (31370471 and U1133601). We thank Dr. David M. Wilkinson and our two referees for insightful comments which help improve the clarity of this paper.
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The authors have declared that no competing interests exist. No specific permissions were required for these activities. Informed consent was obtained from all participants and this field study did not involve endangered or protected species.
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Wang, Y., Yang, J., Liu, L. et al. Quantifying the effects of geographical and environmental factors on distribution of stream bacterioplankton within nature reserves of Fujian, China. Environ Sci Pollut Res 22, 11010–11021 (2015). https://doi.org/10.1007/s11356-015-4308-y
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DOI: https://doi.org/10.1007/s11356-015-4308-y