为改善城市水源地及毗邻水域的水质管理,2019年11月至2020年11月分别在青草沙水库中央沙水域和金泽水库南白荡水域开展了4个季度的采样调查.运用综合营养状态指数(TLI(Σ))对水体营养状态等级进行综合评估,并采用主成分分析(PCA)、冗余分析(RDA)和相关性分析等方法研究了浮游植物群落特征与环境因子的关系.结果表明:中央沙和南白荡水域TLI (Σ)范围分别为57.5~59.0、54.1~56.1,2个水体均处于轻度富营养状态;两者分别鉴定出浮游植物7门104属184种、8门96属172种;蓝藻门是中央沙水域全年浮游植物构成的主要门类,其次为硅藻门、绿藻门,而南白荡浮游植物群落结构季节性演替明显,优势门类由硅藻门/隐藻门-蓝藻门-隐藻门/硅藻门变化,浮游植物细胞密度季节平均值变化范围分为3.00×107~1.61×108 cells/...

为了解青海湖浮游植物群落结构特征、时空分布格局及其关键环境驱动因子,于2020年5月(春)、8月(夏)、10月(秋)对青海湖进行系统调查,分析浮游植物群落在3个季度和4个区域(湖滨带、进水区、浅水区和深水区)间的差异。3次调查共检出浮游植物6门39属65种,物种组成以硅藻(36种,占总物种数的55.38%)、绿藻(17种,26.15%)和蓝藻(7种,10.76%)为主。4个区域间的浮游植物丰度存在显著差别,其中深水区丰度显著高于其他区域,主要原因可能在于深水区的环境较为稳定。3个季节间,浮游植物丰度和生物量具有较大差异:夏季和秋季的丰度、生物量均为春季的近10倍;浮游植物的优势类群和种类也发生了较大的变化:春季最具优势类群为硅藻门,优势种也主要隶属于硅藻门,而夏、秋两季则以蓝藻门种属占据主要优势。春季浮游植物的Pielou均匀度和Simpson多样性指数显著高于夏、秋两季,秋季Mar...

河流中浮游植物的动态变化能够较好的指示河流水质状况.为探索水文气象过程对筑坝河流浮游植物群落结构的影响，2020年夏季，以钱塘江干流为例，对包括富春江水库在内的11个河段开展了浮游植物群落结构及相关环境因子的调查分析.结果表明：夏季在钱塘江干流共鉴定出浮游植物6门59属95种，优势属为沟链藻（Aulacoseir）、菱形藻（Nitzschia）、平裂藻（Merismopedia）、长孢藻（Dolichospermum）、假鱼腥藻（Pseudoanabaena）和微囊藻（Microcystis），其中梅雨期优势属主要隶属于硅藻门，梅雨后蓝藻门种属则迅速占优，浮游植物总细胞密度快速增加；整个夏季浮游植物的平均细胞密度为（1.57±2.96）×106 cells/L，其中梅雨期细胞密度为（0.37±0.36）×106 cells/L，显著低于梅雨...

despite to its importance for retaining biodiversity and human health, urban wetlands have received much less attention than other wetland types in northern iran. this study deals with the floristic characteristics of one of the largest urban wetlands in central mazandaran, roshanabad wetland in babol.  all vascular plants were collected during two growing seasons of 2014 and 2015 and water sam...

Despite to its importance for retaining biodiversity and human health, urban wetlands have received much less attention than other wetland types in northern Iran. This study deals with the floristic characteristics of one of the largest urban wetlands in Central Mazandaran, Roshanabad wetland in Babol.  All vascular plants were collected during two growing seasons of 2014 and 2015 and water sam...

A wave-exposed sea stack and a protected boulder beach at Cayucos Point, California, were compared in terms of their intertidal biota on 17-18 February 1973. The major differences between the two sites appear to be due largely to differences in the shearing forces of waves and habitat structure. The mosaic of crevices, rivulets, and angled substrates in conjunction with a broad gradual slope an...