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<p>The Atchafalaya River Basin is the largest continuously forested floodplain in the United States. This ecosystem has been heavily modified for flood control and human use, often with minimal study into ecological effects on resident biota. As part of modifications, sections of the historic floodplain have been disconnected from the annual flood pulse via an extensive levee system. We examined the influence of the annual flood pulse on aquatic macroinvertebrate assemblages, with an emphasis on Hemiptera, by sampling a connected floodplain and a disconnected floodplain lake across two flood pulses of varying magnitude in 2018 and 2019. On the connected floodplain, flooding-related changes to temperature, dissolved oxygen, and water depth were important factors differentiating early flood and late-flood assemblages. Disconnected floodplain insect assemblages greatly differed from connected floodplain by 50% of taxa, lower richness, and lower densities of 21 of 24 taxa shared between both floodplains. Flooding magnitude between years delayed development of the late-flood assemblage later into the flood pulse. Results suggest, in terms of aquatic insect abundance and composition, aerial dispersal from adjacent (&lt; 100&#xa0;m) floodplain areas cannot replace loss of direct river connectivity. Further, restoration of riverine flooding is important for re-establishing aquatic macroinvertebrate assemblages in disconnected floodplains.</p>

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Effects of flooding on aquatic macroinvertebrate assemblage structure on a connected and disconnected regulated river floodplain

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Patricia L. S. Wooden,
  • William E. Kelso,
  • Michael D. Kaller

摘要

The Atchafalaya River Basin is the largest continuously forested floodplain in the United States. This ecosystem has been heavily modified for flood control and human use, often with minimal study into ecological effects on resident biota. As part of modifications, sections of the historic floodplain have been disconnected from the annual flood pulse via an extensive levee system. We examined the influence of the annual flood pulse on aquatic macroinvertebrate assemblages, with an emphasis on Hemiptera, by sampling a connected floodplain and a disconnected floodplain lake across two flood pulses of varying magnitude in 2018 and 2019. On the connected floodplain, flooding-related changes to temperature, dissolved oxygen, and water depth were important factors differentiating early flood and late-flood assemblages. Disconnected floodplain insect assemblages greatly differed from connected floodplain by 50% of taxa, lower richness, and lower densities of 21 of 24 taxa shared between both floodplains. Flooding magnitude between years delayed development of the late-flood assemblage later into the flood pulse. Results suggest, in terms of aquatic insect abundance and composition, aerial dispersal from adjacent (< 100 m) floodplain areas cannot replace loss of direct river connectivity. Further, restoration of riverine flooding is important for re-establishing aquatic macroinvertebrate assemblages in disconnected floodplains.