Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 640, Issue -, Pages 807-820Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.05.378
Keywords
Southern Yellow Sea; MODIS; HJ-1 CCD; GOCI; Viva prolifera; Chlorophyll-a concentration; Phytoplankton
Categories
Funding
- National Natural Science Foundation of China [41676171]
- Qingdao National Laboratory for Marine Science and Technology of China [2016ASKJ02]
- Natural Science Foundation of Shandong [ZR2015DM015]
- Yantai Science & Technology Project [2013ZH094]
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The world's largest macroalgal blooms (MABs) caused by the Mai prolifera outbreaks have occurred every summer since 2007 in the Southern Yellow Sea, China. Accumulating evidence showed that MABs may deteriorate the regional marine environment and influence the growth of some primary producers such as phytoplankton. In this study, we investigated the spatio-temporal patterns of U. prolifera green tides and chlorophyll-a concentration in the Southern Yellow Sea in 2015 using satellite images obtained from HI-1 CCD, MODIS, and GOCI. The correlation between the distributions of U. prolifera abundance and chlorophyll-a concentration was analyzed quantitatively by setting up a series of 5 x 5 km experimental grids, and we also discussed the possible mechanisms about the influence of U. prolifera blooms on the other floating microalgae. The results showed that the development of U. prolifera blooms in the Southern Yellow Sea in 2015 could be featured as appearance - development - outbreak - decline - disappearance, while the concentration of chlorophyll-a showed increase - sharp decline - slow recovery - stabilization from April to August. We also found that the concentration of chlorophyll-a had the following relationships with U. proliferu temporally: (1) the concentration of chlorophyll-a increased with the growth of U. prolifera from April to mid-May; (2) the chlorophyll-a concentration decreased sharply with the dramatically increased coverage of U. prolifera in June; and (3) the chlorophyll-a concentration slowly recovered and finally stabilized as U. prolifera decreased in July. Generally, there was a negative correlation between the occurrence of U. prolifera and chlorophyll-a concentration in the Southern Yellow Sea, China. Our results showed that the outbreak of U. prolifera does have a certain impact on the growth and reproduction of planktonic microalgae, and it suggests that U. pro lifera blooms have potentially altered the ecological balance in the coastal waters of the Southern Yellow Sea. (C) 2018 Elsevier BM. All rights reserved.
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