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首页> 外文期刊>River research and applications >DENSITY AND DISTRIBUTION OF EPIPHYTIC INVERTEBRATES ON EMERGENT MACROPHYTES IN A FLOODPLAIN BILLABONG
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DENSITY AND DISTRIBUTION OF EPIPHYTIC INVERTEBRATES ON EMERGENT MACROPHYTES IN A FLOODPLAIN BILLABONG

机译：洪泛型附生芽生细生植物上表生无脊椎动物的密度和分布

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摘要

The abundance of epiphytic invertebrates living on both submerged and emergent macrophytes in lentic systems is influenced by a range of environmental features at both spatial and temporal scales. Such features include water chemistry, habitat complexity, hydrology and external influences such as climatic cycles. Dugays 2 billabong is a floodplain lake on the highly regulated, mid-upper Murray River in southeastern Australia. Giant rush (Juncus ingens N.A. Wakefield) is the dominant habitat feature in this billabong. This plant is a simple, single-stemmed, densely packed emergent macrophyte that fringes the littoral margins. The macrophyte habitat available to epiphytic invertebrates in this billabong is highly variable through time largely due to the variable water levels imposed by the regulated river channel for downstream irrigation needs, particularly through summer. To investigate both spatial and temporal patterns in the epiphytic invertebrates of Dugays 2 billabong, invertebrates were sampled within giant rush stands on five occasions over one year. Spatial variability in epifaunal density was generally low, while temporal densities were highly variable through time. Spatial patterns of invertebrate abundance revealed few associations with habitat structure or water quality, apart from those associated with water depth, particularly when sampling had been preceded by fluctuating water levels. High temporal variability in assemblage structure of the epifauna reflects the high background environmental variation that occurs in this system.
机译：在透镜系统中，生活在淹没和出没的大型植物上的附生无脊椎动物的数量受到空间和时间尺度上一系列环境特征的影响。这些特征包括水化学，生境复杂性，水文学和外部影响，例如气候周期。 Dugays 2 billabong是一个洪泛平原湖，位于澳大利亚东南部高度管制的中上游墨累河上。巨峰（Juncus ingens N.A. Wakefield）是该Billabong的主要栖息地特征。该植物是一种简单的，单茎的，密密麻麻的生大型植物，边缘植物边缘。在这个Billabong中，附生无脊椎动物可获得的大型植物栖息地随时间变化很大，这在很大程度上是由于受监管的河道对下游灌溉需求（尤其是整个夏季）施加了不同的水位。为了调查Dugays 2 billabong附生无脊椎动物的空间和时间格局，在一年中五次在巨型急行林中采样了无脊椎动物。表epi密度的空间变异性通常较低，而时间密度随时间变化很大。无脊椎动物的丰富度的空间模式显示出与栖息地结构或水质几乎没有关联，除了与水深相关的情况外，尤其是在采样之前水位波动的情况下。动物群落结构的高时间变化反映了该系统中发生的高背景环境变化。

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