Spatiotemporal Dynamics of Fish Density in a Deep-Water Reservoir: Hydroacoustic Assessment of Aggregation Patterns and Key Drivers

文献类型： 外文期刊

第一作者： Meng, Zihao

作者： Meng, Zihao;Hu, Feifei;Xiang, Miao;Li, Xuemei;Fu, Xuejun

作者机构：

关键词： fish distribution; schooling behavior; environmental gradients; generalized additive models; acoustics monitoring; Zhelin Reservoir

期刊名称：ANIMALS （ 影响因子：2.7； 五年影响因子：3.2 ）

ISSN： 2076-2615

年卷期： 2025 年 15 卷 7 期

页码：

收录情况： SCI

摘要： Understanding spatiotemporal patterns of fish density and their environmental drivers is critical for managing river-lake ecosystems, yet dynamic interactions in heterogeneous habitats remain poorly quantified. This study combined hydroacoustic surveys, spatial autocorrelation analysis (Moran's I), and generalized additive models (GAMs) to investigate seasonal and spatial fish distribution, aggregation characteristics, and regulatory mechanisms in China's Zhelin Reservoir. The results reveal pronounced seasonal fluctuations, with summer fish density peaking at 13.70 +/- 0.91 ind./1000 m(3) and declining to 1.95 +/- 0.13 ind./1000 m(3) in winter. Spatial heterogeneity was evident, with the Xiuhe region sustaining the highest density (15.69 +/- 1.09 ind./1000 m(3)) and persistent hotspots in upstream bays. Transient high-density clusters (90-99% confidence) near the Zhelin Dam during summer suggested thermal or hydrodynamic disturbances. GAM analysis (R(2)adj = 0.712, 78.5% deviance explained) identified seasonal transitions (12.26% variance), water depth (16.54%), conductivity (13.75%), and dissolved oxygen (13.29%) as dominant drivers, with nonlinear responses to depth and bimodal patterns for conductivity/oxygen. These findings demonstrate that hydrological seasonality and habitat heterogeneity jointly govern fish aggregation, underscoring the ecological priority of Xiuhe and upstream bays as core habitats. This study provides a mechanistic framework for guiding reservoir management, including targeted conservation, dam operation adjustments to mitigate hydrodynamic impacts, and integrated strategies for balancing hydrological and ecological needs in similar ecosystems.

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