Year: 2025
Type: article
Abstract: The intensification of eutrophication in global water bodies has exacerbated the occurrence of cyanobacterial blooms, whose secondary metabolites can have detrimental effects on animals, humans, and ecosystems. This study analyzed and statistically evaluated the species composition and distribution of phytoplankton, assessed the concentration of anatoxin-a (ATX-a) in environmental and biological samples (n = 261), and explored the spatial distribution and bioaccumulation of ATX-a in Hulun Lake (Inner Mongolia, China). In late July 2024, the cyanobacteria Dolichospermum spp. comprised 85.5% of the total phytoplankton density. ATX-a levels were vertically distributed with higher concentrations in deeper water (3 m; 146.69 ± 11.84 ng·L−1) and sediments (3.28 ± 0.45 ng·g−1 dry weight) as compared to surface layers (0.5 m; 132.46 ± 8.19 ng·L−1). In fish, bioaccumulation of ATX-a was greatest in the liver (2.37 ± 1.85 ng·g−1), followed by intestinal contents (1.83 ± 0.74 ng·g−1), with minimal accumulation in muscle tissues (1.74 ± 0.77 ng·g−1). ATX-a levels were higher in smaller fish (minnows) than larger fish (Predatory carp, Gibel carp, and European carp). Additionally, all fish tissue samples contained ATX-a, suggesting that aquatic organisms were continuously exposed to ATX-a throughout the summer. A biodilution of ATX-a was observed from phytoplankton (384.82 ± 176.82 ng·L−1) to zooplankton (1.27 ± 0.12 ng·g−1), followed by biomagnification from zooplankton to fish.
Source: Toxics
Authors: Shiyu Li, Rui Liu, Shuhao Guo, Xiaoxuan Chen, Wenxue Wu, Bo Pang, Zixuan Liu, Haiming Ying, Yanlong Zhang, Yanlong Zhang, Yuanyuan Zhang, Yuanyuan Zhang, Chengxue Ma
Institutions: Northeast Forestry University, Northeastern University
Language: English
Subfield: Environmental Chemistry
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
Award: G8521642383
OpenAlex ID: W4416414502