采用荧光显微技术,对2006年长江口及近海水域20个站点的表层及10m层或潜水体冬、春两季的浮游病毒丰度进行了检测,对浮游病毒丰度在季节(冬、春两季)、水平分布和垂直分布上的变化进行了探讨。调查区浮游病毒丰度在冬、春季节上并无明...采用荧光显微技术,对2006年长江口及近海水域20个站点的表层及10m层或潜水体冬、春两季的浮游病毒丰度进行了检测,对浮游病毒丰度在季节(冬、春两季)、水平分布和垂直分布上的变化进行了探讨。调查区浮游病毒丰度在冬、春季节上并无明显差异,但在水平分布上存在很大差异,河口区浮游病毒直接检测量(Virus Direct Count,VDC)达到107个/ml,近海水域VDC为106个/ml,河口区的浮游病毒丰度都明显高于近海水域病毒丰度(P<0.01)。在垂直分布上,冬、春两季长江口水域水深小于10m的站位,表层浮游病毒丰度与底层病毒丰度无明显差别,水深大于10m的站位,表层水样的浮游病毒丰度都高于10m水层病毒丰度,说明长江口浮游病毒的垂直分布与站位总水深有关。还通过比较各站点VDC与叶绿素a含量的数据,分析了二者之间的相关性:冬季浮游病毒丰度与叶绿素a含量成正相关性;春季浮游病毒丰度与叶绿素a含量成负相关性,但病毒丰度受叶绿素a含量的影响仅为10%—11%。展开更多
Virioplankton dynamics at seven sample sites(from two freshwater lakes) with different trophic states were monitored over the period of a year.Water was sampled monthly from August 2004 to July 2005,and the abundances...Virioplankton dynamics at seven sample sites(from two freshwater lakes) with different trophic states were monitored over the period of a year.Water was sampled monthly from August 2004 to July 2005,and the abundances of viruses and bacteria were measured using direct epifluorescence microscopy counting.Results indicated that both natural and anthropogenic factors could influence the distribution of virioplankton.Temporally,viral abundance was significantly correlated to bacterial density and water temperature.Spatially,viral abundance was significantly correlated to trophic state.This in turn indicated that viral abundance was directly dependant on host abundance in eutrophic lakes,while trophic state and temperature could drive the distribution of virioplankton.The virus-bacteria ratio was significantly lower in less productive water-bodies.The result implied that the control of virioplankton on their hosts may change according to the host density.展开更多
文摘采用荧光显微技术,对2006年长江口及近海水域20个站点的表层及10m层或潜水体冬、春两季的浮游病毒丰度进行了检测,对浮游病毒丰度在季节(冬、春两季)、水平分布和垂直分布上的变化进行了探讨。调查区浮游病毒丰度在冬、春季节上并无明显差异,但在水平分布上存在很大差异,河口区浮游病毒直接检测量(Virus Direct Count,VDC)达到107个/ml,近海水域VDC为106个/ml,河口区的浮游病毒丰度都明显高于近海水域病毒丰度(P<0.01)。在垂直分布上,冬、春两季长江口水域水深小于10m的站位,表层浮游病毒丰度与底层病毒丰度无明显差别,水深大于10m的站位,表层水样的浮游病毒丰度都高于10m水层病毒丰度,说明长江口浮游病毒的垂直分布与站位总水深有关。还通过比较各站点VDC与叶绿素a含量的数据,分析了二者之间的相关性:冬季浮游病毒丰度与叶绿素a含量成正相关性;春季浮游病毒丰度与叶绿素a含量成负相关性,但病毒丰度受叶绿素a含量的影响仅为10%—11%。
基金Supported by the National Natural Science Foundation of China(No.30470344and30670088)Key Technology Project of Hubei Province(No.2006AA305A04)Commonweal Project of State Oceanic Administration of China(No.200705014)
文摘Virioplankton dynamics at seven sample sites(from two freshwater lakes) with different trophic states were monitored over the period of a year.Water was sampled monthly from August 2004 to July 2005,and the abundances of viruses and bacteria were measured using direct epifluorescence microscopy counting.Results indicated that both natural and anthropogenic factors could influence the distribution of virioplankton.Temporally,viral abundance was significantly correlated to bacterial density and water temperature.Spatially,viral abundance was significantly correlated to trophic state.This in turn indicated that viral abundance was directly dependant on host abundance in eutrophic lakes,while trophic state and temperature could drive the distribution of virioplankton.The virus-bacteria ratio was significantly lower in less productive water-bodies.The result implied that the control of virioplankton on their hosts may change according to the host density.
