Spatial-temporal variation of Aureococcus anophagefferens blooms in relation to environmental factors in the coastal waters of Qinhuangdao, China.

Abstract:

:The brown tides occurring in the coastal scallop cultivation area of Qinhuangdao, China, in recent years are caused by Aureococcus anophagefferens and significantly impact the scallop industry and the marine ecosystem in this region. Long-term investigations of phytoplankton and hydrological variables in the Qinhuangdao sea area were conducted in this study to understand the spatial-temporal variations of A. anophagefferens in relation to environmental factors. Samples were collected during twelve cruises from July 2011 to December 2013 and were analyzed for the temperature, salinity, dissolved oxygen (DO), nutrients and phytoplankton pigments. All diagnostic pigments of A. anophagefferens, such as chlorophyll c3 (Chl c3), Chl c2, 19'-butanoyloxyfucoxanthin (But-fuco), fucoxanthin (Fuco), and diadinoxanthin (Diad), were detected in the surface water by using high-performance liquid chromatography (HPLC). The highest concentrations of But-fuco (5.64 μg L-1), Fuco (37.94 μg L-1) and chlorophyll a (Chl a, 17.25 μg L-1) occurred in different seasons and sampling sites. The A. anophagefferens bloom (as indicated by But-fuco) usually expanded from the south to the north of the Qinhuangdao sea area, close to scallop-culturing regions. The bloom unusually starts in May, reaches its peak in June and almost disappears in August, with the temperature ranging from ca. 19 °C to 23 °C. The redundancy analysis (RDA) indicated that relatively high salinity (>29) and low inorganic nutrients were suitable for the development of the A. anophagefferens bloom. The ratios of diagnostic pigments to Chl a were not constant during different cruises and generally obeyed two different linear relationships, thus indicating the co-occurrence of the blooms of A. anophagefferens and other species, such as Minutocellus polymorphus. In summary, our work reports the long-term variation of A. anophagefferens blooms based on diagnostic pigments and environmental controls, which may provide more insights into the formation mechanisms of the brown tide in this region.

journal_name

Harmful Algae

journal_title

Harmful algae

authors

Yao P,Lei L,Zhao B,Wang J,Chen L

doi

10.1016/j.hal.2019.05.011

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

106-118

eissn

1568-9883

issn

1878-1470

pii

S1568-9883(19)30085-X

journal_volume

86

pub_type

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