Comparison of environmental responding strategies between Ulva prolifera and Sargassum horneri: an in-situ study during the co-occurrence of green tides and golden tides in the Yellow Sea, China in 2017

2021 ◽  
Author(s):  
Xinyu Zhao ◽  
Yi Zhong ◽  
Huanxin Zhang ◽  
Tongfei Qu ◽  
Chengzong Hou ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Ulva Prolifera ◽  
Sargassum Horneri ◽  
The Yellow Sea ◽  
Green Tides ◽  
In Situ Study

scholarly journals Ulva prolifera green-tide outbreaks and their environmental impact in the Yellow Sea, China

2019 ◽  
Vol 6 (4) ◽  
pp. 825-838 ◽  
Author(s):  
Yongyu Zhang ◽  
Peimin He ◽  
Hongmei Li ◽  
Gang Li ◽  
Jihua Liu ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Red Tide ◽  
Abiotic Factors ◽  
Management Strategies ◽  
Ulva Prolifera ◽  
The Yellow Sea ◽  
Green Tide ◽  
Biological Interactions ◽  
Green Tides ◽  
Carbon Cycles

Abstract The Ulva prolifera green tides in the Yellow Sea, China, which have been occurring since 2007, are a serious environmental problem attracting worldwide attention. Despite extensive research, the outbreak mechanisms have not been fully understood. Comprehensive analysis of anthropogenic and natural biotic and abiotic factors reveals that human activities, regional physicochemical conditions and algal physiological characteristics as well as ocean warming and biological interactions (with microorganism or other macroalgae) are closely related to the occurrence of green tides. Dynamics of these factors and their interactions could explain why green tides suddenly occurred in 2007 and decreased abruptly in 2017. Moreover, the consequence of green tides is serious. The decay of macroalgal biomass could result in hypoxia and acidification, possibly induce red tide and even have a long-lasting impact on coastal carbon cycles and the ecosystem. Accordingly, corresponding countermeasures have been proposed in our study for future reference in ecosystem management strategies and sustainable development policy.

A dynamic growth model of Ulva prolifera: Application in quantifying the biomass of green tides in the Yellow Sea, China

2020 ◽  
Vol 428 ◽  
pp. 109072 ◽  
Author(s):  
Ke Sun ◽  
Jeffrey S. Ren ◽  
Tao Bai ◽  
Jihong Zhang ◽  
Qing Liu ◽  
...  
Keyword(s):  
Growth Model ◽  
Yellow Sea ◽  
Ulva Prolifera ◽  
The Yellow Sea ◽  
Green Tides ◽  
Dynamic Growth

scholarly journals Assessing Herbivorous Impacts of Apohale sp. on the Ulva prolifera Green Tide in China

2021 ◽  
Vol 12 ◽  
Author(s):  
Xiaoxiang Miao ◽  
Jie Xiao ◽  
Shiliang Fan ◽  
Yu Zang ◽  
Xuelei Zhang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Algal Biomass ◽  
Large Scale ◽  
Algal Growth ◽  
Ulva Prolifera ◽  
The Yellow Sea ◽  
Green Tide ◽  
Species Identity ◽  
Green Tides ◽  
The Southern Yellow Sea

An epiphytic gammarid species, Apohyale sp., was abundant in the floating Ulva prolifera (U. prolifera), which forms large-scale green tides in the Yellow Sea (YSGT). Field observation and laboratory experiments were subsequently conducted to study the species identity, abundance, and grazing effects on the floating algal biomass. The abundance of Apohyale sp. showed great spatial variation and varied from 0.03 to 1.47 inds g−1 in the YSGT. In average, each gram of Apohyale sp. body mass can consume 0.43 and 0.60 g algal mass of U. prolifera per day, and the grazing rates varied among the algae cultured with different nutritional seawaters. It was estimated that grazing of Apohale sp. could efficiently reduce ~0.4 and 16.6% of the algal growth rates in Rudong and Qingdao, respectively. The U. prolifera fragments resulting from gnawing of Apohyale sp. had a higher growth rate and similar photosynthetic activities compared to the floating algae, indicating probably positive feedback on the floating algal biomass. This research corroborated the significant impact of Apohyale sp. on the floating algal mass of YSGT through the top-down control. However, further research is needed to understand the population dynamics of these primary predators and hence their correlation with the expansion or decline of YSGT, especially under the complex food webs in the southern Yellow Sea.

Application of a fluorescence in situ hybridization (FISH) method to study green tides in the Yellow Sea

2015 ◽  
Vol 163 ◽  
pp. 112-119 ◽  
Author(s):  
Qing-Chun Zhang ◽  
Qing Liu ◽  
Ren-Cheng Yu ◽  
Zhen-Jun Kang ◽  
Wei Guo ◽  
...  
Keyword(s):  
In Situ Hybridization ◽  
Fluorescence In Situ Hybridization ◽  
Yellow Sea ◽  
The Yellow Sea ◽  
Green Tides ◽  
Fish Method

The contribution of attached Ulva prolifera on Pyropia aquaculture rafts to green tides in the Yellow Sea

2020 ◽  
Vol 39 (2) ◽  
pp. 101-106
Author(s):  
Hongbin Han ◽  
Shiliang Fan ◽  
Wei Song ◽  
Yan Li ◽  
Jie Xiao ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Ulva Prolifera ◽  
The Yellow Sea ◽  
Green Tides

scholarly journals Sequences Analysis of ITS Region and 18S rDNA of Ulva

ISRN Botany ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Zijie Lin ◽  
Zhongheng Lin ◽  
Huihui Li ◽  
Songdong Shen
Keyword(s):  
Genetic Distance ◽  
Yellow Sea ◽  
18S Rdna ◽  
Sequence Divergence ◽  
Its Region ◽  
Ulva Prolifera ◽  
The Yellow Sea ◽  
Green Tides ◽  
Rdna Sequences ◽  
Green Algal

Ulva, as the main genera involved in green tides in the Yellow Sea, has attracted serious concern in China. Especially, Ulva prolifera is one of the causative species of the occurring. This paper focused on the complete sequences analyses of ITS, 18S, and the combined data to determine phylogenetic relationships among taxa currently attributed to Ulva, Monostroma, and some other green algal. The samples are all concluded in the area of Yellow Sea, China. The results showed the content of G+C in 18S was approximately concentrated upon 49% in average of 19 subjects while the ITS region content of base G and C is obviously higher than A and T. Comparing the ITS and 18S rDNA sequences obtained in this paper to other species retrieved from GenBank, the genetic distance and the ratio of sequence divergence reflect that U. pertusa and U. prolifera had closer genetic relationship with an 18S rDNA, which had genetic distance of 0.007 while ITS had further genetic distance. According to further comparison, Ulva prolifera has closest genetic distance with Chloropelta caespitosa (0.057) and Ulva californica (0.057), which is a reverification coincided Chloropelta, Enteromorpha, and Ulva are not distinct genera.

Temporal succession of community structure and biphase ratio in a natural population of Ulva spp. (Chlorophyta) attached to Pyropia rafts in the Yellow Sea, China

2019 ◽  
Vol 62 (6) ◽  
pp. 549-561
Author(s):  
Yu Du ◽  
Yuan Ao ◽  
Yuan He ◽  
Yi Yin ◽  
Yafeng Ma ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Internal Transcribed Spacer ◽  
Algal Blooms ◽  
Null Model ◽  
Ulva Prolifera ◽  
The Yellow Sea ◽  
Green Tide ◽  
Continuous Change ◽  
Green Tides ◽  
Temporal Succession

Abstract Green tide algal blooms occur worldwide, especially in China’s Yellow Sea, and have caused serious damage to local ecological environments and economies. As a dominant agent of green tides, the green macroalga Ulva has caused widespread concern. In this study, phylogenetic clades were constructed among related Ulva species isolated from Pyropia rafts at six sites over 1.5 years based on internal transcribed spacer (ITS) and tufA sequences. In addition, traditional observation ploidy methods and flow cytometry methods were used to analyse continuous change in the biphase and sex ratios of Ulva species and to assess the changes in phase advantages over time. The results showed that the perennial Ulva populations on rafts mainly consisted of Ulva flexuosa and Ulva prolifera, and the biphasic dominance of the attached Ulva populations changed with the seasons: sporophytes were predominant mainly in winter and spring, and gametophytes were predominant mainly in summer and autumn. At the same time, there were some differences in gametophyte and sporophyte frequencies (mainly sporophyte biased) compared to the null model prediction of a √2:1 ratio, while the sex ratio of male and female gametophytes remained 1:1 throughout the year. Our results indicate the presence of both phases of bloom-forming species of Ulva in green tides year round, and that multiple generations coexist and grow continuously.

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