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Article

The Morphology, Genetic Diversity, and Distribution of Ulva meridionalis (Ulvaceae, Chlorophyta) in Chinese Seas

by
Meijuan Hu
1,†,
Shuang Zhao
1,†,
Jinlin Liu
1,†,
Yichao Tong
1,
Zhangyi Xia
1,
Jing Xia
1,2,
Shuang Li
1,
Yuqing Sun
1,
Jiaxing Cao
1 and
Jianheng Zhang
1,3,4,*
1
College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China
2
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
3
Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
4
Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang 222005, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
J. Mar. Sci. Eng. 2022, 10(12), 1873; https://doi.org/10.3390/jmse10121873
Submission received: 8 November 2022 / Revised: 25 November 2022 / Accepted: 28 November 2022 / Published: 3 December 2022
(This article belongs to the Special Issue New Insights in the Study of Harmful Algal Bloom)
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Abstract

Green tides originate from the rapid growth of green macroalgae and their large accumulation. In the past few decades, the severity and frequency of green tides have increased and the range of their geographical distribution has widened. In recent years, Ulva meridionalis Horimoto et Shimada has been reported in many countries. This species has stable morphological characteristics, and its length can reach 3 m in indoor cultures. Its cells contain pyrenoids, and the sporangium and gametangium of each cell contain 8 spores and 16 gametes, respectively, which confer a high proliferation potential. The phylogenetic tree constructed in this study showed that the Internal Transcribed Spacer sequence identified U. meridionalis with a high identification reliability, and the genetic relationship between U. meridionalis and Ulva pertusa in the ITS sequence was close. The haplotype network analysis clarified the relationship of the U. meridionalis samples collected from four different sea areas in China and indicated that they were closely related. Five haplotypes were identified: Hap_2 and Hap_1 were the most frequent, and they were also the haplotypes shared among the three groups. The degree of subspecies formation was not reached among these U. meridionalis samples collected from the Chinese seas. Up to 20 years ago, U. meridionalis had only been recorded in Japan. After 2011, it has been found to be widely distributed in the United States, China, French New Caledonia, French Polynesia, and Australia, where it proliferates. It has spread as a new kind of green tide-forming macroalga. The present study found that U. meridionalis is widely distributed in the Chinese seas; specifically, there have been small-scale blooms in the Bohai Sea, the Yellow Sea, and the South China Sea. Further investigations should focus on establishing whether U. meridionalis will cause large-scale green tide events in the future.
Keywords: Ulva meridionalis; Ulvaceae; algal bloom; Yellow Sea; intertidal zone Ulva meridionalis; Ulvaceae; algal bloom; Yellow Sea; intertidal zone

Share and Cite

MDPI and ACS Style

Hu, M.; Zhao, S.; Liu, J.; Tong, Y.; Xia, Z.; Xia, J.; Li, S.; Sun, Y.; Cao, J.; Zhang, J. The Morphology, Genetic Diversity, and Distribution of Ulva meridionalis (Ulvaceae, Chlorophyta) in Chinese Seas. J. Mar. Sci. Eng. 2022, 10, 1873. https://doi.org/10.3390/jmse10121873

AMA Style

Hu M, Zhao S, Liu J, Tong Y, Xia Z, Xia J, Li S, Sun Y, Cao J, Zhang J. The Morphology, Genetic Diversity, and Distribution of Ulva meridionalis (Ulvaceae, Chlorophyta) in Chinese Seas. Journal of Marine Science and Engineering. 2022; 10(12):1873. https://doi.org/10.3390/jmse10121873

Chicago/Turabian Style

Hu, Meijuan, Shuang Zhao, Jinlin Liu, Yichao Tong, Zhangyi Xia, Jing Xia, Shuang Li, Yuqing Sun, Jiaxing Cao, and Jianheng Zhang. 2022. "The Morphology, Genetic Diversity, and Distribution of Ulva meridionalis (Ulvaceae, Chlorophyta) in Chinese Seas" Journal of Marine Science and Engineering 10, no. 12: 1873. https://doi.org/10.3390/jmse10121873

APA Style

Hu, M., Zhao, S., Liu, J., Tong, Y., Xia, Z., Xia, J., Li, S., Sun, Y., Cao, J., & Zhang, J. (2022). The Morphology, Genetic Diversity, and Distribution of Ulva meridionalis (Ulvaceae, Chlorophyta) in Chinese Seas. Journal of Marine Science and Engineering, 10(12), 1873. https://doi.org/10.3390/jmse10121873

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