Spatial and Temporal Distribution Patterns of Fish in Large Deep-Water Lakes and Their Association with Environmental Factors Assessed Through Hydroacoustic Methods: A Case Study of Qiandao Lake, China DOI Open Access

Lei Hao,

Haibin Lin,

Shuaikang Cui

et al.

Water, Journal Year: 2024, Volume and Issue: 16(24), P. 3543 - 3543

Published: Dec. 10, 2024

A comprehensive understanding of the spatial and temporal distribution fish their relationship with aquatic environments is essential for assessing ecological impacts, advancing lake conservation, optimizing fisheries management strategies. In this study, we investigated patterns resources in Qiandao Lake, a large, deep-water eastern China, using hydroacoustic methods. The results revealed pronounced heterogeneity horizontal within lake. Fish density peaked autumn at 74.77 (±5.59) ind./1000 m2 reached its lowest level winter 14.65 (±1.18) m2. Regionally, densities upstream (northwestern), midstream (central), downstream (southeastern) areas were 84.80 (±4.32), 64.16 (±5.15), 53.88 (±8.78) m2, respectively, showing an increasing trend distance from dam. vertical also exhibited seasonal regional variation. spring, summer, autumn, peak target strengths recorded −50 to −45 dB range, most measuring 10–20 cm length. contrast, during winter, shifted −40 smallest proportion falling 1–10 size category, while distributions across other ranges relatively uniform. Generalized additive model (GAM) analysis that was significantly influenced by environmental factors such as dissolved oxygen (DO), pH, nitrite (NO2−), phosphate (PO43−), chemical demand (CODMn). These findings suggest lakes shaped variations water quality, additional impacts human activities, including opening shipping lanes policies. This research provides valuable insights large lakes.

Language: Английский

Spatiotemporal Dynamics of Fish Density in a Deep-Water Reservoir: Hydroacoustic Assessment of Aggregation Patterns and Key Drivers DOI Creative Commons
Zihao Meng, Feifei Hu, Miao Xiang

et al.

Animals, Journal Year: 2025, Volume and Issue: 15(7), P. 1068 - 1068

Published: April 7, 2025

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), generalized additive models (GAMs) to investigate seasonal distribution, aggregation characteristics, regulatory mechanisms China's Zhelin Reservoir. The results reveal pronounced fluctuations, with summer peaking at 13.70 ± 0.91 ind./1000 m3 declining 1.95 0.13 winter. Spatial heterogeneity was evident, the Xiuhe region sustaining highest (15.69 1.09 m3) persistent hotspots upstream bays. Transient high-density clusters (90-99% confidence) near Dam during suggested thermal or hydrodynamic disturbances. GAM (R2adj = 0.712, 78.5% deviance explained) identified transitions (12.26% variance), water depth (16.54%), conductivity (13.75%), dissolved oxygen (13.29%) as dominant drivers, nonlinear responses bimodal conductivity/oxygen. These findings demonstrate that hydrological seasonality habitat jointly govern aggregation, underscoring ecological priority bays core habitats. provides a mechanistic framework guiding reservoir management, including targeted conservation, dam operation adjustments mitigate impacts, integrated strategies balancing needs similar ecosystems.

Language: Английский

Citations

0
Spatial and Temporal Distribution Patterns of Fish in Large Deep-Water Lakes and Their Association with Environmental Factors Assessed Through Hydroacoustic Methods: A Case Study of Qiandao Lake, China DOI Open Access

Lei Hao,

Haibin Lin,

Shuaikang Cui

et al.

Water, Journal Year: 2024, Volume and Issue: 16(24), P. 3543 - 3543

Published: Dec. 10, 2024

A comprehensive understanding of the spatial and temporal distribution fish their relationship with aquatic environments is essential for assessing ecological impacts, advancing lake conservation, optimizing fisheries management strategies. In this study, we investigated patterns resources in Qiandao Lake, a large, deep-water eastern China, using hydroacoustic methods. The results revealed pronounced heterogeneity horizontal within lake. Fish density peaked autumn at 74.77 (±5.59) ind./1000 m2 reached its lowest level winter 14.65 (±1.18) m2. Regionally, densities upstream (northwestern), midstream (central), downstream (southeastern) areas were 84.80 (±4.32), 64.16 (±5.15), 53.88 (±8.78) m2, respectively, showing an increasing trend distance from dam. vertical also exhibited seasonal regional variation. spring, summer, autumn, peak target strengths recorded −50 to −45 dB range, most measuring 10–20 cm length. contrast, during winter, shifted −40 smallest proportion falling 1–10 size category, while distributions across other ranges relatively uniform. Generalized additive model (GAM) analysis that was significantly influenced by environmental factors such as dissolved oxygen (DO), pH, nitrite (NO2−), phosphate (PO43−), chemical demand (CODMn). These findings suggest lakes shaped variations water quality, additional impacts human activities, including opening shipping lanes policies. This research provides valuable insights large lakes.

Language: Английский

Citations

1