Environmental gradients regulate the spatial variations of phytoplankton biomass and community structure in surface water of the Pearl River estuary

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• 作者：Gang Li^a ; Qiang Lin^a ; Junda Lin^b ; Xingyu Song^a ; Yehui Tan^a ; Liangmin Huang^a ; ^{hlm@scsio.ac.cn" class="auth_mail}
• 关键词：Environmental gradients ; Phytoplankton ; Chl a ; Community ; Pearl River estuary
• 刊名：Acta Ecologica Sinica
• 出版年：April, 2014
• 年：2014
• 卷：34
• 期：2
• 页码：129-133
• 全文大小：1078 K

文摘

Regulations of estuarine environmental gradient on phytoplankton communities were evaluated about the Pearl River estuary during June 25 to July 2 of 2009 (wet season) and January 11 to 16 of 2010 (dry season). Downstream increase of salinity was 0.19 and 0.23 per km in wet and dry seasons; whereas the decrease of content was 0.57 and 5.54 渭mol L^鈭? per km, of was 0.013 and 0.014 渭mol L^鈭? per km and of was 1.05 and 2.89 渭mol L^鈭? per km. Chl a biomass decreased from 11.3 to 1.94 渭g L^鈭? and from 12.5 to 2.04 渭g L^鈭? in wet and dry seasons, respectively; while total phytoplankton abundance decreased from 2.42 脳 10⁶ to 3.05 脳 10⁵ cells L^鈭? and from 1.59 脳 10⁶ to 0.32 脳 10⁵ cells L^鈭?, with the dominating groups changing from diatoms and chlorophytes to solely diatoms. In particular, the nutrient was found to limit the growth of phytoplankton in wet season, but not in dry season. Our results also indicate that chlorophytes are more sensitive to salinity changes than other species in this estuary.