Succession of the Nanoplankton Community during a Brown Tide in a Scallop Culture Area in China

Ocean Science Journal - Brown tides caused by Aureococcus anophagefferens have occurred frequently in the coastal waters of Qinhuangdao since 2009. The Changli coast is the area most strongly...     

SWBM模型在锡林河流域气候变化影响评价中的应用

以内蒙古地区的锡林河流域为研究对象,采用考虑融雪的水量平衡模型(SWBM模型),在对锡林河流域水文模拟的基础上,评估了流域水资源对气候变化的响应。结果表明:SWBM模型锡林河流域月径流过程具有较好的模拟效果,率定期和检验期的模型效率系数均超过60%,相对误差也均小于8%,在未来全球气候变化背景下,流域水资源以减少趋势为主,2030年之后,减少幅度将可能超过10%。     

护滩软体排对潮滩碱蓬湿地修复的影响研究——以江苏条子泥为例

河口海岸潮滩湿地具有重要的生态服务功能,是近年来国家海岸带保护修复重大工程的重点关注区域。江苏条子泥潮滩湿地是中国黄（渤）海候鸟栖息地（第一期）的重要组成部分,面临着潮滩湿地保护修复和海堤工程维护的统筹协调等问题。护岸工程软体排是河口海岸工程常用的维护措施,但其对潮滩湿地保护和修复的影响尚不清楚。通过野外调查、碱蓬移栽和播种试验,分析了护滩软体排工程临近区域的高程、水动力、沉积物等环境参数对盐地碱蓬（Suaeda salsa）湿地修复的影响。结果表明：1）软体排对潮滩地貌影响明显,软体排内滩面稳定,软体排外亦有掩护效果,两月内促进盐沼植被区高程增量达29 cm,软体排外光滩高程变化剧烈;软体排建造后,海堤附近滩面地形有助于碱蓬植被定植,形成的高滩上移栽碱蓬存活率达55%,而在低处潮滩无法存活。2）碱蓬植被密度和株高受到盐度、高程、中值粒径环境因子的显著影响（P<0.05,P为显著性水平）,高程与碱蓬植被密度、株高正相关;盐度和中值粒径与碱蓬植被密度负相关;流速与碱蓬植被密度负相关;有效波高与碱蓬株高负相关。研究结果可为潮滩软体排护滩工程的实施、碱蓬盐沼植被定植机理和生态修复提供科...     

Amplicon-Based Illumina Sequencing and Quantitative PCR Reveals Nanoplankton Diversity and Biomass in Surface Water of Qinhuangdao Coastal Area,China

Aureococcus anophagefferens caused brown tides for three consecutive years from 2009 to 2011 in the coastal waters of Qinhuangdao, China, with numerous, widespread ecological and economic impact on ecosystems. To understand the population dynamics of nanoplankton during the brown tides, sequences of the V9 region of the 18 S rDNA gene, used as a marker, were analyzed by Illumina sequencing to assess nanoplankton biomass, and real-time fluorescence quantitative PCR was performed to analyze spatial variation in the 18 S rDNA copy concentrations of nanoplankton off the Qinhuangdao coast in July, 2011. The results showed that A. anophagefferens and Minutocellus polymorphus were the dominant species in the local phytoplankton community during the brown tide in July 2011. The highest 18 S rDNA copy concentrations of A. anophagefferens and M. polymorphus were detected at stations SHG and FN, respectively. The central area most strongly affected by the brown tide migrated southward from 2011 to 2013. Redundancy analysis(RDA) showed that the decreasing NOx concentration might provide suitable nutrient conditions for the A. anophagefferens outbreak. During the brown tide caused by A. anophagefferens, other phytoplankton, such as diatoms, cryptophytes, chlorophytes, dinoflagellates and other flagellates, could co-occur with it. For zooplankton, due to less selective feeding behavior, Amoebozoa was the most abundant zooplankton at station SHG, while Ciliophora was the most abundant zooplankton at other stations for its more selective feeding.