...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Hydrobiologia >Spatial variation of phytoplankton composition, biovolume, and resulting microcystin concentrations in the Nyanza Gulf (Lake Victoria, Kenya)
【24h】

Spatial variation of phytoplankton composition, biovolume, and resulting microcystin concentrations in the Nyanza Gulf (Lake Victoria, Kenya)

机译：Nyanza海湾（肯尼亚维多利亚湖）中浮游植物组成，生物量以及所产生的微囊藻毒素浓度的空间变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Nyanza Gulf is a large shallow bay of Lake Victoria suffering from eutrophication by human activities. In order to characterize the harmful algal bloom formation as a consequence of eutrophication, both spatially and seasonally, environmental conditions, phytoplankton community composition, and microcystin (MC) concentrations were investigated monthly from Kisumu Bay, and bimonthly from the center of the gulf, as well as quarterly from the Rusinga Channel and the main basin of Lake Victoria between July 2008 and September 2009. The sites located in Kisumu Bay and the central gulf were most strongly affected by eutrophication, including increased nutrient concentrations and phytoplankton growth. More than 90% of the samples obtained from the gulf were dominated by cyanobacteria, whereas diatoms only dominated in the samples obtained from Rusinga Channel and the main lake. In general, Microcystis accounted for the largest part (> 50-90%) of cyanobacterial biovolume. MCs were found in 35 (54%) out of 65 samples and were detected throughout the study period in the gulf, but only in two out of eight samples from the Rusinga Channel and the main lake. A significant linear relationship between Microcystis biovolume and MC concentration was observed (n = 65, R (2) = 0.88, P < 0.001). The highest MC concentrations were recorded in Kisumu Bay between November and March (max. 81 mu g l(-1)) when Microcystis showed max. biovolume (18 mm(3) l(-1) in November 2008). The results suggest that seasonal variability did not outweigh the spatial differences in phytoplankton composition and MC production, which is seasonally persistent in Kisumu Bay.
机译：Nyanza海湾是维多利亚湖的大型浅湾，遭受人类活动造成的富营养化。为了表征富营养化造成的有害藻华的形成，在空间和季节上，每月从基苏木湾（Kisumu Bay）和海湾中心每两个月调查一次环境条件，浮游植物群落组成和微囊藻毒素（MC）浓度。以及2008年7月至2009年9月之间的Rusinga海峡和维多利亚湖主要盆地的季度。富营养化对基苏木湾和中部海湾的位置影响最大，包括营养物浓度增加和浮游植物生长。从海湾获得的样本中有90％以上是蓝细菌，而硅藻仅在从Rusinga Channel和主湖中获得的样本中占主导。通常，微囊藻占蓝藻生物量的最大部分（> 50-90％）。在65个样本中有35个（54％）发现了MC，并且在整个研究期间都在海湾中检测到MC，但在Rusinga海峡和主湖中只有8个样本中有2个被发现。微囊藻的生物量和MC浓度之间存在显着的线性关系（n = 65，R（2）= 0.88，P <0.001）。当微囊藻显示最大浓度时，11月至3月在基苏木湾记录到最高MC浓度（最大81μg l（-1））。生物体积（2008年11月为18 mm（3）l（-1））。结果表明，季节性变化没有超过浮游植物组成和MC产量的空间差异，而浮游植物组成和MC产量在基苏木湾是季节性的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号