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Benthic invertebrate communities structure in headwater streams with different states of the riparian vegetation conservation
Community Ecology ( IF 1.7 ) Pub Date : 2020-04-23 , DOI: 10.1007/s42974-020-00011-w
A. L. U. Melo , E. R. Ono , V. S. Uieda

Many studies assess the impact of anthropogenic activities in water bodies using methods that focus on physical, chemical and microbiological characteristics of water. The use of benthic invertebrates as tools for biomonitoring protocols helps the understanding of those impacts, when these modifications cannot be explained only by the water characteristics. We analyzed the environmental characteristics and invertebrate fauna structure in an 80 m extension of streams located in four micro-basins. This reach-scale analysis included streams of three riparian vegetation conservation states: preserved in both riverbanks (forested), removed in both riverbanks for pasture (pasture), and one riverbank with riparian vegetation and another with pasture (intermediate). The environmental data analysis indicated a clear separation between the forested and pasture streams, emphasizing the interaction of the state of riparian vegetation’s preservation with some habitat characteristics, such as width, substrate type and shelter for the fauna. Our initial hypothesis about the benthic invertebrates’ structure was to find in streams with conserved riparian vegetation a benthic fauna composed mainly by groups more specialized and dependent on coarse substrate and plant material imported from the forest and used as shelter and food resource. This hypothesis was confirmed, with higher abundance of groups sensitive to pollution, such as Plecoptera and Trichoptera, mainly in preserved streams. However, when analyzed together the environmental characteristics and the OTUs that best explained the land uses’ differences (RDA analysis), in two micro-basins there was more fauna’s similarity between intermediate and pasture profiles, and in the other two the three profiles differed from each other. These differences may be related not only to reach-scale physical characteristics, but also to catchment-scale attributes of each micro-basin, as the invertebrate distribution and abundance are influenced by a variety of physical/biological factors at different scales. Thus, the study of the possible influence of riparian vegetation conservation states on habitat characteristics and benthic invertebrate structure seems to be dependent on the spatial scale analyzed.

中文翻译:

河岸植被保护状态不同的源流中的底栖无脊椎动物群落结构

许多研究使用关注水的物理,化学和微生物特征的方法评估了人为活动对水体的影响。当不能仅通过水的特性来解释这些改变时,将底栖无脊椎动物用作生物监测规程的工具有助于理解这些影响。我们分析了位于四个微流域的80 m延伸流中的环境特征和无脊椎动物区系结构。此范围分析包括三个河岸植被保护状态的流:保留在两个河岸(森林),两个河岸都被放牧(草场),一个河岸有河岸植被,另一个河岸有牧场(中级)。环境数据分析表明,森林流与牧场流之间存在明显的分隔,强调了河岸植被的保存状态与某些栖息地特征(如宽度,底物类型和动物庇护所)之间的相互作用。我们关于底栖无脊椎动物结构的最初假设是在河岸植被得到保护的溪流中发现底栖动物,这些底栖动物主要由更专业的群体组成,并依赖于从森林中进口的粗基质和植物材料,用作庇护所和粮食资源。证实了这一假说,对污染敏感的群体有很多,例如鞘翅目和毛鳞翅目,主要存在于保存的河流中。然而,当一起分析环境特征和最能解释土地利用差异的OTU(RDA分析)时,在两个微流域中,牧区剖面之间的动物区系相似性更高,而在另外两个中,这三个剖面彼此不同。 。这些差异可能不仅与达到尺度的物理特征有关,而且与每个微流域的流域尺度的属性有关,因为无脊椎动物的分布和丰度受到不同尺度上各种物理/生物因素的影响。因此,研究河岸植被保护状态对生境特征和底栖无脊椎动物结构的可能影响的研究似乎取决于所分析的空间尺度。在两个微型流域中,中型和牧场型之间的动物群相似性更高,而在另外两个中,三个型态彼此不同。这些差异可能不仅与达到尺度的物理特征有关,而且与每个微流域的流域尺度的属性有关,因为无脊椎动物的分布和丰度受到不同尺度上各种物理/生物因素的影响。因此,研究河岸植被保护状态对生境特征和底栖无脊椎动物结构的可能影响的研究似乎取决于所分析的空间尺度。在两个微型流域中,中型和牧场型之间的动物群相似性更高,而在另外两个中,三个型态彼此不同。这些差异可能不仅与达到尺度的物理特征有关,而且与每个微流域的流域尺度的属性有关,因为无脊椎动物的分布和丰度受到不同尺度上各种物理/生物因素的影响。因此,研究河岸植被保护状态对生境特征和底栖无脊椎动物结构的可能影响的研究似乎取决于所分析的空间尺度。因为无脊椎动物的分布和丰度受到不同规模的各种物理/生物因素的影响。因此,研究河岸植被保护状态对生境特征和底栖无脊椎动物结构的可能影响的研究似乎取决于所分析的空间尺度。因为无脊椎动物的分布和丰度受到不同规模的各种物理/生物因素的影响。因此,研究河岸植被保护状态对生境特征和底栖无脊椎动物结构的可能影响的研究似乎取决于所分析的空间尺度。
更新日期:2020-04-23
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