Phytoplankton dynamics in and near the highly eutrophic Pearl River Estuary, South China Sea
Phytoplankton dynamics in and near the highly eutrophic Pearl River Estuary, South China Sea
复制标题
南海珠江口高度富营养化及其附近浮游植物动态
DOI：
10.1016/j.csr.2009.10.015
复制
发表时间：
2010-02-15
影响因子：
2.3
通讯作者：
Lin, Senjie
中科院分区：
文献类型：
--
作者：
Qiu, Dajun;Huang, Liangmin;Lin, Senjie
2005年初春（3月）和初秋（9月），利用显微镜、流式细胞仪和叶绿素分析等方法，研究了珠江口及邻近近岸海域浮游植物的大小分异随盐度梯度的变化规律。在盐度低于30的河口内缘，浮游植物群落在早春和早秋均以微纳米级（3 ~ 200 μ m）细胞为主，以硅藻骨藻为主。在含盐量为bbb30的地区，包括混合区和近岸海水，在初春期间，河流流量影响最小，微纳米级细胞群占主导地位，而由于停留时间短，微纳米级（30）区域对浮游植物丰度，特别是近岸水域的浮游植物丰度产生强烈影响，否则会减少营养。受高DIN丰度和磷限制的影响，邻近近岸海域浮游植物季节性上升。研究结果表明，珠江口富营养化不仅刺激了珠江口富营养区海岸藻的生长，而且至少在我们的秋季游船期间，还促进了邻近低营养海域的聚球菌和微真核生物的生长。2009爱思唯尔有限公司版权所有。
The dynamics of size-fractionated phytoplankton along the salinity gradient in the Pearl River Estuary and the adjacent near-shore oceanic water was investigated using microscopic, flow cytometric, and chlorophyll analyses in the early spring (March) and early autumn (September) of 2005. In the inner part of the estuary where salinity was less than 30, the phytoplankton community was dominated by micro- and nano-sized (3-200 mu m) cells, particularly the diatom Skeletonema costatum, both in early spring and early autumn. In areas where salinity > 30, including the mixing zone and nearshore oceanic water, micro- and nano-sized cell populations dominated the phytoplankton assemblage during early spring when influence of river discharge was minimal, whereas pico-sized ( 30) areas as a result of short residence time, exerting a strong influence on phytoplankton abundance, especially picophytoplankton in the nearshore, otherwise oligotrophic, water. Influenced by high abundance of DIN and limitation in phosphorus, picophytoplankton in the adjacent nearshore oceanic water rose to prominence seasonally. Our results indicate that eutrophication in the Pearl River Estuary not only stimulates the growth of S. costatum in the nutrient-rich areas of the estuary but also appears to promote the growth of Synechococcus and pico-eukaryotes in the adjacent usually oligotrophic oceanic water at least during our autumn cruise. (C) 2009 Elsevier Ltd. All rights reserved.