Morphology and molecular identification of Ulva forming green tides in Qingdao, China
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Green tides are caused by the proliferation of chlorophytes under suitable hydrographic conditions. These blooms lead to environmental degradation and negatively impact the waters and seagrass beds, as well as fishing and other recreational activities in the bay. A comprehensive ecological understanding of the bloom dynamics, including the origin and persistence, is needed to foster management decisions. The algae in the great majority of green tide blooms usually belong to two genera of Ulvophyceae, Ulva and Enteromorpha. Ulva has been observed more often in recent years. In China, green tides occurred for the first time in the middle area of the Yellow Sea in 2007, and a large-scale algae blooming broke out in the middle and southern areas of the Yellow Sea in late May 2008. We identified them as Ulva prolifera by comparative analysis of the rDNA internal transcribed spacer 1 (ITS1), 5.8S and ITS2 sequences in combination with microscopic observation. Morphological differences were found between the free-floating algae and the attached thalli. Various reproduction patterns of the free-floating algae include sexual, asexual and vegetative propagations, which played important roles in the long-term green tide persistence in China. The ITS sequences of the blooming algae were identical to those of the samples from the Lianyungang sea area but were different from the attached samples from the Qingdao sea area. The results infer that the blooms are originated from other sea areas rather than from the local attached populations.
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- Morphology and molecular identification of Ulva forming green tides in Qingdao, China
Journal of Ocean University of China
Volume 10, Issue 1 , pp 73-79
- Cover Date
- Print ISSN
- Online ISSN
- SP Science Press
- Additional Links
- Ulva prolifera
- green tides
- ITS sequences
- phylogenetic analysis
- Industry Sectors
- Author Affiliations
- 1. College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, P. R. China
- 2. Key Laboratory of Marine Genetics and Gene Resource Exploitation of Ministry of Education, Ocean University of China, Qingdao, 266003, P. R. China
- 3. College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266003, P. R. China