

FOLLOWUS
1.College of Marine Life Sciences, Ocean University of China, Qingdao 266100, China
2.Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
Xuexi TANG, E-mail: tangxx@ouc.edu.cn
Ying WANG, E-mail: ywang@ouc.edu.cn
收稿:2020-03-30,
录用:2020-4-27,
网络首发:2020-05-24,
纸质出版:2021-05
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Investigation of the decline of
Ya HAO, Chen GUAN, Xinyu ZHAO, et al. Investigation of the decline of
Investigation of the decline of
Ya HAO, Chen GUAN, Xinyu ZHAO, et al. Investigation of the decline of
It has been a scientific consensus that
Ulva prolifera
green tide that break out annually between May and August in the recent decade off eastern coast of Yellow Sea. To investigate the ecological mechanism of the decline of
U
.
prolifera
green tide
we compared the physiological characteristics of
U
.
prolifera
samples collected in three stages of the green tide in Subei Shoal north Jiangsu
the initiation point
on May 10 (early
the initiation)
July 10 (middle
the outbreak)
and in Taipingjiao
Qingdao on August 10 (late
the decline). Compared to the early samples
the middle
and late samples showed a lower chlorophyll content and photosynthetic efficiency at a higher lipid peroxidation level. The middle and later samples had fewer chloroplasts in the cells of
U
.
prolifera
than those in the early samples. In addition
the cells of
U
.
prolifera
sampled in the late stage showed ruptured and deformed cell walls. Differences in physiological function were reflected in the growth rate. Both the middle and late
U
.
prolifera
samples presented negative growth rates. Correlation analysis results show that the rising temperature was mainly responsible for the local decline of
U
.
prolifera
green tide. The high light-intensity that could induce the photoinhibition was also an important factor for the decline. Therefore
U
.
prolifera
population that remained in the Subei Shoal and those that northward drifted to Qingdao experienced the same decline processes: rising temperature and continuous high light conditions in the late phase of green tide reduced the photosynthetic capacity and destroyed the antioxidant system of the thallus
which lead to decrease of biomass. The only difference is that the temperature in the Subei Shoal rose earlier than that in Qingdao; thus
U
.
prolifera
remaining in the Subei Shoal went disappeared first.
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