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<p>The introduction of aquatic exotic macrophytes has a major impact on the biodiversity and functioning of freshwater ecosystems by altering the structure of these habitats. Invertebrate assemblages present on sediment and plant leaves of native and exotic macrophyte beds of <i>Ranunculus penicillatus</i>, <i>Potamogeton perfoliatus</i> (natives) and <i>Egeria densa</i> (exotic), in the Minho River estuary (Portugal), were analysed during the spring and summer of 2023. The introduction of <i>E. densa</i> in the estuary of the Minho River has been shown to alter sediment characteristics by increasing the percentage of fine sediment and deposited organic matter. Assemblages observed on sediment associated with <i>E. densa</i> have lower diversity and are dominated by the oligochaete <i>Bothrioneurum vejdovskyanum</i>. This habitat is distinct from the sediments associated with native macrophytes <i>R. penicillatus</i> and <i>P. perfoliatus</i>, which are typically favoured by <i>Corbicula fluminea</i> and <i>Cryptochironomus rostratus</i>. On the other hand, <i>E. densa</i> leaves show higher invertebrate diversity and abundance than native macrophytes and higher affinities with exotic invertebrates such as <i>Menetus dilatatus</i>, <i>Physella acuta</i> and <i>Girardia sinensis</i>, while native flora attracted mainly native insects with aquatic life stages. The effects of compact <i>E. densa</i> beds on water flow also affects invertebrate assemblages presenting higher abundances of species with preference for stagnant water.</p>

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Role of exotic macrophyte beds in habitat structuring and impact on the diversity of macroinvertebrate assemblages

  • 期刊论文

  • 发表日期：

    2025年8月10日

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  • Nuno Gomes,
  • Isabel Sousa-Pinto,
  • Carlos Antunes

摘要

The introduction of aquatic exotic macrophytes has a major impact on the biodiversity and functioning of freshwater ecosystems by altering the structure of these habitats. Invertebrate assemblages present on sediment and plant leaves of native and exotic macrophyte beds of Ranunculus penicillatus, Potamogeton perfoliatus (natives) and Egeria densa (exotic), in the Minho River estuary (Portugal), were analysed during the spring and summer of 2023. The introduction of E. densa in the estuary of the Minho River has been shown to alter sediment characteristics by increasing the percentage of fine sediment and deposited organic matter. Assemblages observed on sediment associated with E. densa have lower diversity and are dominated by the oligochaete Bothrioneurum vejdovskyanum. This habitat is distinct from the sediments associated with native macrophytes R. penicillatus and P. perfoliatus, which are typically favoured by Corbicula fluminea and Cryptochironomus rostratus. On the other hand, E. densa leaves show higher invertebrate diversity and abundance than native macrophytes and higher affinities with exotic invertebrates such as Menetus dilatatus, Physella acuta and Girardia sinensis, while native flora attracted mainly native insects with aquatic life stages. The effects of compact E. densa beds on water flow also affects invertebrate assemblages presenting higher abundances of species with preference for stagnant water.