The impact of rare and common species loss on community functional diversity in fish community of Zhoushan fishing ground

Qian Jun; Li Yuru; Zhou Zhongnan; Wang Yingbin; Hu Chengye; Wang Jing

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Qian Jun，Li Yuru，Zhou Zhongnan, et al. The impact of rare and common species loss on community functional diversity in fish community of Zhoushan fishing ground[J]. Haiyang Xuebao，2025, 47(x)：1–9

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The impact of rare and common species loss on community functional diversity in fish community of Zhoushan fishing ground

1.
School of Fisheries of Zhejiang Ocean University, Zhoushan 316022, China
2.
Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, China

Received Date: 2024-10-22
Rev Recd Date: 2025-04-18

Available Online: 2025-05-30

Abstract

Abstract

This study is based on survey data of fish communities in the Zhoushan fishing ground and uses a resampling technique to simulate the random loss of rare and common species. It also employs a biomass proportion reduction method to simulate scenarios of biomass loss, in order to explore the mechanisms by which the loss of different ecological groups affects functional diversity in fish communities. The results show that although rare species account for only 3% of the total community biomass, their species richness constitutes nearly 40% of the community, indicating an important ecological niche within the community structure. The simulation of species loss scenarios revealed that the loss of rare species’ richness directly impacts the functional diversity indices, specifically leading to a decrease in functional richness and an increase in functional evenness, while functional divergence and Rao’s quadratic entropy indices showed no significant changes. In contrast, the loss of common species’ richness resulted in a decline in functional richness, while the other three functional diversity indices remained relatively stable. Under the biomass loss scenarios, the reduction in rare species’ biomass led to unchanged functional richness but declines in functional evenness, functional divergence, and Rao’s quadratic entropy indices. The functional evenness index exhibited a nonlinear decline that started slowly and then accelerated, while the other two indices showed linear decreasing patterns. In contrast, the loss of common species’ biomass caused the latter three indices to decline in a pattern that started rapidly and then slowed down. Rare species occupy unique functional niches in the community, with their functional traits distributed at the edges of the multidimensional functional space. They play a unique role in maintaining community functional diversity. Strengthening the protection of rare species and their habitats is a key strategy for maintaining regional ecosystem diversity and stability.
- fish community,
- rare species,
- functional diversity,
- simulated loss

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References(27)

References

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