湘江干流浮游生物群落结构及水质状况分析

目的罗梭江桥工程跨越罗梭江鱼类州级自然保护区，为了解罗梭江桥工程建成后对水生态的影响，对桥梁工程区域水生生物资源进行调查。方法参照水环境监测规范SL 219—98采集水样，根据国家标准进行分析评价；依据《内陆水域渔业资源调查手册》，采用实地捕捞、市场调查和走访了解等方法进行水生生物的调查研究。结果共检测出浮游植物计5门36属，组成以硅藻门为主，生物多样性指数为1.98~2.62；检测出浮游动物95属165种，原生动物种类最多，以浮游动物综合分析江段水质，调查区域属轻清洁水体；检测出大型底栖动物26种，种类最多的是软体动物门；采集到鱼类34种，隶属于4目13科30属，土著鱼占比79.41%，为典型的东南亚热带鱼类区系类型。结论调查区水生生物资源现存量丰富，跨江建桥对水体影响非常有限，而且大多能在短期恢复。

Ecology and distribution of diatoms in Biscayne Bay,Florida (USA): implications for bioassessment and paleoenvironmental studies

PurposeThe Luosuo River bridge project spans the Luosuo River State Fish Nature Reserve. In order to understand the impact the completion of Luosuo river bridge project on water ecology, we investigated the aquatic biological resources in the bridge engineering area.MethodWater samples were collected, analyzed and evaluated according to national standards (SL 219—98); according to the handbook of fishery resources investigation in inland waters, the methods of on-the-spot fishing, market investigation and visiting were used to investigate and study aquatic organisms.ResultIt turns out that there were 36 genera, 5 phyla of phytoplankton, of which was mainly composed of Bacillariophyta. The biodiversity of phytoplankton ranged from 1.98 to 2.62. There were 95 genera, 165 species of zooplankton, of which protozoa account for the most. We comprehensively analyzed the water quality of the river section with zooplankton and investigated the area as light clean water. We detected 26 species of large benthic animals, of which the largest species is phylum mollusca. We collected 34 species of fish belonging to 4 orders, 13 families, 30 genera, of which indigenous fish accounted for 79.41%.ConclusionExisting aquatic biological resources in the survey area are abundant. Building bridges across rivers has very limited impact on water bodies, most of which can be restored in the short term.