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<p>Intermittent streams naturally alternate between flowing, pool and dry phases driven by temperature and precipitation patterns, strongly affecting the life cycle of aquatic organisms. We investigated post-rewetting colonisation in a clay-dominated intermittent stream in continental Croatia to describe the spatio-temporal colonisation dynamics of benthic macroinvertebrates and identify the main environmental drivers structuring community composition after rewetting. Benthic macroinvertebrates were collected at ten sites across three stream sections differing in channel modification and anthropogenic impact during six events from early (5–25&#xa0;days) to later (84–119&#xa0;days) rewetting phases over a&#xa0;one&#xa0;year&#xa0;period. Physical and chemical water parameters and organic matter were measured to identify differences between sections and effects on community structuring. Chironomidae larvae were the most abundant taxon (almost 30% of total mean abundance). Recolonisation was rapid, with all major taxonomic groups present only 5&#xa0;days after rewetting. Communities were primarily structured by seasonality, separating early from later colonisers, while spatial differences among stream sections were less pronounced. Particulate organic matter differed among stream sections and influenced colonisation but did not affect taxonomic diversity. This study highlights small intermittent streams for studying recolonisation processes and provides new insights into macroinvertebrate colonisation dynamics important for future restoration and mitigation planning.</p>

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Benthic macroinvertebrate recolonisation following rewetting in an intermittent stream: how does it work?

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Denis Bućan,
  • Vlatka Mičetić Stanković,
  • Djuradj Milošević,
  • Valentina Dorić,
  • Ivana Pozojević,
  • Marina Vilenica,
  • Marina Šumanović,
  • Marko Miliša

摘要

Intermittent streams naturally alternate between flowing, pool and dry phases driven by temperature and precipitation patterns, strongly affecting the life cycle of aquatic organisms. We investigated post-rewetting colonisation in a clay-dominated intermittent stream in continental Croatia to describe the spatio-temporal colonisation dynamics of benthic macroinvertebrates and identify the main environmental drivers structuring community composition after rewetting. Benthic macroinvertebrates were collected at ten sites across three stream sections differing in channel modification and anthropogenic impact during six events from early (5–25 days) to later (84–119 days) rewetting phases over a one year period. Physical and chemical water parameters and organic matter were measured to identify differences between sections and effects on community structuring. Chironomidae larvae were the most abundant taxon (almost 30% of total mean abundance). Recolonisation was rapid, with all major taxonomic groups present only 5 days after rewetting. Communities were primarily structured by seasonality, separating early from later colonisers, while spatial differences among stream sections were less pronounced. Particulate organic matter differed among stream sections and influenced colonisation but did not affect taxonomic diversity. This study highlights small intermittent streams for studying recolonisation processes and provides new insights into macroinvertebrate colonisation dynamics important for future restoration and mitigation planning.