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首页> 外文期刊>Limnologica >Environmental variables likely influence the periphytic diatom community in a subtropical lotic environment
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Environmental variables likely influence the periphytic diatom community in a subtropical lotic environment

机译：环境变量可能影响亚热带奶酪环境中的鸟素硅藻群体

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摘要

We evaluated the response of diatom community relative to environmental changes with the aim of characterizing and comparing, along a linear gradient, three environments across the Cascavel River microbasin with distinct land-uses. In June 2016, 10 substrates were collected for periphyton extraction in locations with different land-uses (conservation, urban, and agriculture respectively). One-hundred and nine infrageneric taxa and 30 genera were found. Eunotia and Gomphonema presented elevated and representative taxa richness at all stations, with totals of 14 and 11 respectively. Pinnularia and Navicula (12 and 8 taxa respectively) were significant indicators at the more upstream points; while Encyonema, Achnanthidium and Navicula (5, 5, and 6 taxa respectively) occurred primarily downstream. The sampling stations were quite distinct in their densities, species richness, and physical, chemical, and biological characteristics. The tests showed a significant difference among the stations based on the species abundance matrix. Upstream points, within the conservation area, revealed high Eunotia density, high nitrate concentrations and low pH. The urbanized area was characterized by greater exposure to light associated with elevated electrical conductivity and high ammoniacal nitrogen concentration, favoring the cosmopolitan species development such as Gomphonema lagenula, Gomphonema exilissimum and Fragilaria gracilis. The agricultural area exhibited elevated flow, a factor limiting the colonization of species and favoring the development of Achnanthidium and Fragilaria species. The distribution of the community across the microbasin were related to flow, dissolved oxygen, electrical conductivity, nitrate, ammonia, and total coliforms, confirming the distinctiveness among the environments. Except for spatial autocorrelation, there wasn't a single environmental filtering explanation for the diatom community variation. The abiotic variables differentiated the environment in conjunction with the spatial variation. Along the river, physical characteristics such as depth, water volume, flow, solar incidence, concentration of solids, and temperature varied, directly interfer with the periphytic community's primary production.
机译：我们评估了硅藻群体相对于环境变化的响应，目的是沿着线性梯度，穿过Cascavel河微汽油蛋白的三种环境，具有不同的土地用途。 2016年6月，在不同土地用途（保护，城市和农业）的地点中收集了10种底物的植物素萃取。发现了一百九个InfraGeneric Taxa和30属。 Eunotia和Gomphonema在所有站点上提升和代表性的分类群，分别为14和11次。 Pinnularia和Navicula（分别为12和8个分类群）在更多上游点是重要指标;虽然Concyonema，Achnanthidium和Navicula（分别）主要发生在下游。采样站在密度，物种丰富性和物理，化学品和生物学特征中完全不同。基于物种丰度矩阵，该试验显示了该网站的显着差异。在保护区内的上游点揭示了高昆菊植物密度，高硝酸盐浓度和低pH值。城市化地区的特征在于较高的电导率和高氨氮浓度相关的光线，偏好，优先于甘氨酸骆驼，Gomphonema Exilissimum和Fragilaria Gracilis等化学群。农业面积呈现升高，是限制物种殖民的因素，并有利于疼痛和浮宫菌的发展。微磁性血素的社区分布与流动，溶解的氧气，导电性，硝酸盐，氨和总大肠杆菌有关，确认了环境中的独特性。除了空间自相关，没有针对硅藻群体变异的单一环境过滤解释。非生物变量与空间变化结合差异化环境。沿着河流，物理特性，如深度，水量，流量，太阳能发射，固体浓度和温度变化，直接干扰围网群落的主要生产。

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