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<p>The increase in the extension of agricultural lands has an impact on streams all over the world, affecting water quality depending on river size. The aim of our work was to describe the ecological status of streams of different orders immersed in an agricultural matrix through physicochemical and biological indicators (vegetation and macroinvertebrates). Data was gathered at 11 streams of different orders according to Strahler's scale, in a basin located in an agricultural matrix. The streams were found to have high concentrations of nutrients and chlorophyll <i>a</i>, with minimal differences in physicochemical indicators among riverine ecosystems of various sizes. The riparian habitats indicators showed the lowest values in the first-order streams, while river habitat indicators showed no differences between stream orders. Most of the found macroinvertebrates taxa are tolerant to organic contamination, and they were distributed uniformly throughout the basin, to which the streams belong. We conclude that first-order streams are the most adversely affected by agricultural land use, with the highest concentrations of nutrients and chlorophyll a, the lowest QBR values, and the greatest abundance of tolerant taxa. Second and third-order streams showed fewer signs of alteration than first-order streams, with higher QBR values and lower concentrations of nutrients and chlorophyll a. In addition, the metrics for tolerant taxon richness (total number of taxa, genera, families, and predators) showed lower values.</p>

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Assessment of the environmental status of agriculturally influenced streams of different orders in the Pampeana region of Argentina

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Capeletti Julieta,
  • Alberto Diana,
  • Facelli Florencia,
  • Zilli Florencia

摘要

The increase in the extension of agricultural lands has an impact on streams all over the world, affecting water quality depending on river size. The aim of our work was to describe the ecological status of streams of different orders immersed in an agricultural matrix through physicochemical and biological indicators (vegetation and macroinvertebrates). Data was gathered at 11 streams of different orders according to Strahler's scale, in a basin located in an agricultural matrix. The streams were found to have high concentrations of nutrients and chlorophyll a, with minimal differences in physicochemical indicators among riverine ecosystems of various sizes. The riparian habitats indicators showed the lowest values in the first-order streams, while river habitat indicators showed no differences between stream orders. Most of the found macroinvertebrates taxa are tolerant to organic contamination, and they were distributed uniformly throughout the basin, to which the streams belong. We conclude that first-order streams are the most adversely affected by agricultural land use, with the highest concentrations of nutrients and chlorophyll a, the lowest QBR values, and the greatest abundance of tolerant taxa. Second and third-order streams showed fewer signs of alteration than first-order streams, with higher QBR values and lower concentrations of nutrients and chlorophyll a. In addition, the metrics for tolerant taxon richness (total number of taxa, genera, families, and predators) showed lower values.