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首页> 外文期刊>Aquatic Sciences >Influences of agricultural landuse and seasonal changes in abiotic conditions on invertebrate colonisation of riparian leaf detritus in intermittent streams
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Influences of agricultural landuse and seasonal changes in abiotic conditions on invertebrate colonisation of riparian leaf detritus in intermittent streams

机译：农业用地和非生物条件的季节性变化对断续河中河岸叶碎屑无脊椎动物定殖的影响

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摘要

The structure and function of agricultural stream reaches with sparse riparian and floodplain vegetation differ from those of forested reaches, but may be 'reset' as these streams flow through reaches with forested riparian zones. We investigated whether invertebrate colonisation of River Red Gum (Eucalyptus camaldulensis) leaf packs in lowland intermittent streams was influenced by the adjacent reach-scale landuse (cleared farmland or forested reserve) within an agricultural catchment in Victoria, Australia. Further, we examined the influence of seasonal changes in hydrology and associated changes in abiotic conditions on the colonisation of leaves by repeating experiments over two summers and one spring. Across these experiments, there were no consistent differences in the structure of communities that colonised leaves in farmland and reserve reaches. In both seasons, most leaf colonists were collectors and few were shredders in both farmland and reserve reaches. Relative abundances of gastropod grazers were much higher in summer than in spring. The structure of invertebrate communities colonising leaves in the different reaches converged over time when streams flowed in spring, but diverged over time as the streams dried and abiotic conditions within disconnected pools became increasingly harsh in summer. Thus, patterns of leaf pack colonisation were influenced by the regional climate causing large seasonal changes in hydrology, but not by reach-scale landuse. The large-scale disturbances of agricultural landuse across the catchment and a supra-seasonal drought probably contributed to low diversities of invertebrate communities in the streams.
机译：沿岸植被稀疏的农业河段的结构和功能与有林河段的河床植被不同，但当这些水流流经有河岸带的河段时，可能会被“重置”。我们调查了在澳大利亚维多利亚州一个农业流域内，低地间歇性溪流中的红胶河桉树（无尾桉树）叶群的无脊椎动物定殖是否受到邻近的触及范围土地利用（耕地或森林保护区）的影响。此外，我们通过在两个夏天和一个春天进行重复实验，研究了水文季节性变化和非生物条件的相关变化对叶片定植的影响。在这些实验中，农田和保护区中的叶片定殖的群落结构没有一致的差异。在这两个季节中，农田和保护区中大多数叶子殖民者都是采集者，很少是切碎机。夏季腹足类食草动物的相对丰度比春季高得多。当春季溪流流动时，在不同河段定居的无脊椎动物群落结构随时间收敛，但随着溪流干燥以及不连续的水池中的非生物条件在夏季变得越来越严峻，其随时间变化。因此，叶丛定殖的模式受区域气候影响而导致水文学季节性大变化，但不受土地利用规模的影响。流域内农业土地利用的大规模扰动和超季节干旱可能导致河流中无脊椎动物群落的多样性较低。

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  • 来源
    《Aquatic Sciences》 |2013年第2期|285-297|共13页
  • 作者

    David J. Reid; P. S. Lake; Gerry P. Quinn;

  • 作者单位

    School of Biological Sciences,Monash University, Clayton,VIC 3800, Australia,School of Life and Environmental Sciences,Deakin University, Warrnambool,VIC 3280, Australia;

    School of Biological Sciences,Monash University, Clayton,VIC 3800, Australia;

    School of Life and Environmental Sciences,Deakin University, Warrnambool,VIC 3280, Australia;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    detritus; leaf pack; riparian; hydrology; functional feeding group; multiple stressor;

    机译：碎屑叶包;河岸;水文学功能性喂养组;多重压力源;

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