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Background <p>Fish functional response to conservation measures such as fishing bans is very important for lake biodiversity conservation but remains less studied.</p> Methods <p>We conducted a 6-year fish community investigation in Luoma Lake of the Huai River Basin in China, including three years (2018–2020) before and three years (2021–2023) after a full fishing ban (i.e., complete removal of fishing pressure). Taxonomic and functional diversity indices, including species richness, Shannon and Simpson diversity index, Pielou’s evenness, functional richness (FRic), functional evenness (FEve), and functional dispersion (FDis), were used to assess community-level changes. Community-weighted mean (CWM) values were calculated from 12 functional traits, and R-mode linked to Q-mode (RLQ) analysis combined with the fourth-corner test was conducted to link traits to environmental gradients.</p> Results <p>We found no significant change in fish abundance and taxonomic diversity, but fish biomass and functional richness increased significantly after the fishing ban. Non-metric multidimensional scaling (NMDS) and similarity percentage (SIMPER) analysis indicated that the fish community underwent significant compositional changes following the fishing ban. Trait–environment analysis showed that age at first maturity, mouth position, body shape, feeding habit, and life history strategy were significantly associated with environmental gradients.</p> Conclusions <p>These results suggest that the fishing ban promoted early functional recovery and ecological reorganization processes of the fish community, highlighting the functional mechanisms underlying assemblage restructuring.</p>

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Fish biomass and functional diversity recovery following a fishing ban in Luoma Lake of the Huai River Basin, China

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Xinyu Zhu,
  • Zhining Shi,
  • Xiao Qu,
  • Bo Yang,
  • Han Liu,
  • Wentong Xia,
  • Yushun Chen

摘要

Background

Fish functional response to conservation measures such as fishing bans is very important for lake biodiversity conservation but remains less studied.

Methods

We conducted a 6-year fish community investigation in Luoma Lake of the Huai River Basin in China, including three years (2018–2020) before and three years (2021–2023) after a full fishing ban (i.e., complete removal of fishing pressure). Taxonomic and functional diversity indices, including species richness, Shannon and Simpson diversity index, Pielou’s evenness, functional richness (FRic), functional evenness (FEve), and functional dispersion (FDis), were used to assess community-level changes. Community-weighted mean (CWM) values were calculated from 12 functional traits, and R-mode linked to Q-mode (RLQ) analysis combined with the fourth-corner test was conducted to link traits to environmental gradients.

Results

We found no significant change in fish abundance and taxonomic diversity, but fish biomass and functional richness increased significantly after the fishing ban. Non-metric multidimensional scaling (NMDS) and similarity percentage (SIMPER) analysis indicated that the fish community underwent significant compositional changes following the fishing ban. Trait–environment analysis showed that age at first maturity, mouth position, body shape, feeding habit, and life history strategy were significantly associated with environmental gradients.

Conclusions

These results suggest that the fishing ban promoted early functional recovery and ecological reorganization processes of the fish community, highlighting the functional mechanisms underlying assemblage restructuring.