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首页> 外文期刊>Aquatic Sciences >Spatial patterns in macroinvertebrate assemblages in surface-flowing waters of a glacially-influenced floodplain
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Spatial patterns in macroinvertebrate assemblages in surface-flowing waters of a glacially-influenced floodplain

机译：受冰川影响的洪泛区地表流动水中大型无脊椎动物组合的空间格局

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摘要

We examined the spatial structure of macroinvertebrate assemblages in surface-flowing waters of a glacially-influenced floodplain. The floodplain main-channel responded longitudinally to changes in hydrology with evident coarse-scale zones of upwelling and downwelling; the lower floodplain main channel fell dry in late winter. Physico-chemical attributes differed among tributaries and the main channel. The main channel had lower values of conductivity, alkalinity and nitrate-N than tributaries, with right-side (east-facing) tributaries having the highest values. Left-side (west-facing) tributaries flowing over an exposed rock-face had warmer water temperatures than the main channel and right-side tributaries. The biomass of benthic organic matter and periphyton was highest in right-side tributaries, followed by main channel sites then leftside tributaries. Similarly, macroinvertebrate density and richness were higher in right-side tributaries, intermediate in main channel sites, and lowest in left-side tributaries. Macroinvertebrate assemblages clearly differed between main channel sites, right-side tributaries, and left side tributaries based on an NMDS analysis. Minor differences were observed among main channel sites, although most upstream sites showed some structural differences from downstream sites. Ephemeropterans and plecopterans were most common in main channel sites and right-side tributaries, whereas chironomids and trichopterans also were common in right-side tributaries. Although the main channel changed longitudinally in physico-chemical characteristics, no real patterns of zonation were evident in macroinvertebrate assemblages. Coarse spatial patterns in macroinvertebrate assemblages in the floodplain were reflected in the physico-chemical differences between the main channel and tributaries, and between left-side and right-side tributaries. We conclude that coarse-scale floodplain properties enhance the overall diversity of lotic macroinvertebrates. Consequently, floodplain alterations that reduce surface water heterogeneity/connectivity limits the potential macroinvertebrate diversity of floodplains.
机译：我们检查了受冰川影响的洪泛区地表流水中大型无脊椎动物组合的空间结构。洪泛区主河道对水文变化具有纵向响应，并有明显的上涌和下涌的粗尺度区域。下泛洪主干道在冬季末干dry。支流和主要渠道之间的理化属性不同。主通道的电导率，碱度和硝酸盐-N值低于支流，右侧（朝东）支流的值最高。在裸露的岩面上流过的左侧（朝西）支流的水温比主航道和右侧支流要高。底流支流中底栖有机质和附生植物的生物量最高，其次是主要通道，然后是左支流。同样，右侧支流的大型无脊椎动物密度和丰富度较高，在主要河道位点居中，而左侧支流的最低。根据NMDS分析，主要渠道地点，右侧支流和左侧支流之间的大型无脊椎动物组合明显不同。在主要渠道站点之间观察到较小的差异，尽管大多数上游站点显示出与下游站点的一些结构差异。 phe翅目和鳞翅目最常见于主要渠道地点和右侧支流，而天龙目和翅翅目也常见于右侧支流。尽管主要通道的理化特性在纵向上发生了变化，但在大型无脊椎动物组合中没有明显的带状分布。洪泛区大型无脊椎动物组合中的粗大空间格局反映在主要河道和支流之间以及左侧和右侧支流之间的理化差异上。我们得出的结论是，洪泛区的粗略性质增强了大型无脊椎动物的整体多样性。因此，减少表层水非均质性/连通性的洪泛区变化限制了洪泛区潜在的大型无脊椎动物多样性。

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