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首页> 外文期刊>Lakes & Reservoirs >Seasonal variations of phytoplankton species in Lake Victoria and the influence of iron and zinc ions on the dominant species identified during 2006-2007 studies
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Seasonal variations of phytoplankton species in Lake Victoria and the influence of iron and zinc ions on the dominant species identified during 2006-2007 studies

机译：维多利亚湖浮游植物种类的季节性变化以及铁和锌离子对2006-2007年研究期间确定的优势种的影响

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摘要

The current study was conducted for 2 years (2006 and 2007) during January, April and September to investigate seasonal variations in biological parameters and planktonic biodiversity observed at four sampling sites (MRM, M500, SRM and S500) in Lake Victoria. Blue-green algae (Cyanophyta) dominated the lakeshore waters of Lake Victoria, comprising 54.1% of the total algal content, compared to 24.4% for diatoms and 14.7% for green algae (Chlorophyta). Euglenophytes and dinoflagellates both constitute ＜10% of the algal biomass. The algal distribution at the Sango Bay sampling sites, however, is different in that it is dominated by diatoms, in contrast to Murchison Bay, which was dominated by blue-green algae. This study also investigated the influence of iron (Fe~(2+)and Fe~(3+)) and zinc (Zn~(2+)) ions on four strains of microcystis (CYN 464, CYN 465, CYN 478 and CYN 522) isolated from Murchison Bay in Lake Victoria. The suggestion that iron species and zinc ions might limit phytoplankton growth in Lake Victoria was tested by enriching algal culture media with different metal concentrations. Based on measurements of the algal biomass of four species of Lake Victoria, the algal biomass of the four microcystis strains generally decreased with increased zinc and Fe~(2+) concentrations. The algal biomass of the four strains, however, increased with increased Fe~(3+) concentrations. This response to different metal concentrations provides evidence that high Zn~(2+) and Fe~(2+) ion concentrations limit phytoplankton growth and species distribution. The availability of Fe~(3+) ions is an important selective force on Lake Victoria phytoplankton communities.
机译：当前的研究在1月，4月和9月进行了2年（2006年和2007年），以调查在维多利亚湖四个采样点（MRM，M500，SRM和S500）观察到的生物学参数和浮游生物多样性的季节性变化。蓝绿色藻类（蓝藻）在维多利亚湖的湖岸水域中占主导地位，占总藻类含量的54.1％，而硅藻和绿藻（绿藻类）占24.4％。藻类和鞭毛藻均构成藻类生物量的＜10％。但是，与以蓝藻为主的默奇森湾相反，三果湾采样点的藻类分布不同，因为它以硅藻为主。本研究还研究了铁离子（Fe〜（2+）和Fe〜（3+））和锌离子（Zn〜（2+））对四种微囊藻菌株（CYN 464，CYN 465，CYN 478和CYN）的影响522）与维多利亚湖的默奇森湾隔离。通过富集不同金属浓度的藻类培养基，检验了铁物种和锌离子可能限制维多利亚湖浮游植物生长的建议。根据对维多利亚湖四种物种的藻类生物量的测量，四种微囊藻菌株的藻类生物量通常随着锌和Fe〜（2+）浓度的增加而降低。然而，这四个菌株的藻类生物量随Fe〜（3+）浓度的增加而增加。这种对不同金属浓度的响应提供了高Zn〜（2+）和Fe〜（2+）离子浓度限制浮游植物生长和物种分布的证据。 Fe〜（3+）离子的存在是维多利亚湖浮游植物群落的重要选择力。

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