Distinct trophic transfer of rare earth elements in adjacent terrestrial and aquatic food webs

Zongling Ren; Xiaodan Wu; Bei Cai; Xiaobo Zheng; Bixian Mai; Rongliang Qiu

doi:10.1016/j.jhazmat.2024.136990

Distinct trophic transfer of rare earth elements in adjacent terrestrial and aquatic food webs

J Hazard Mater. 2024 Dec 24:486:136990. doi: 10.1016/j.jhazmat.2024.136990. Online ahead of print.

Authors

Zongling Ren¹, Xiaodan Wu¹, Bei Cai¹, Xiaobo Zheng², Bixian Mai³, Rongliang Qiu⁴

Affiliations

¹ Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
² Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China. Electronic address: zhengxiaobo@scau.edu.cn.
³ State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China.
⁴ Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China. Electronic address: qiurl@scau.edu.cn.

PMID: 39724709
DOI: 10.1016/j.jhazmat.2024.136990

Abstract

Growing demand and usage of rare earth elements (REEs) lead to significant pollution in wildlife, but trophic transfer of REEs in different food webs has not been well understood. In the present study, bioaccumulation and food web transfer of 16 REEs (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, and Sc) were investigated in different terrestrial and aquatic species. Median concentrations of REEs in plant, invertebrate, fish, amphibian, reptile, bird, and vole samples were 488-6030, 296-2320, 123-598, 17.5-88.1, 88.0, 14.2-92.0, and 170 μg/kg, respectively. The REE concentrations decreased as plants > invertebrates > fishes > amphibians and snakes > birds. The biomagnification factors (BMFs) and trophic biomagnification factors of most REEs were lower than 1, indicating trophic dilution of REEs. Most poikilotherms including fishes, amphibians, and snakes presented higher BMFs of REEs than homotherms including birds and voles (p < 0.05). Negative correlations were observed between REE concentrations and δ¹³C (p < 0.01), not δ¹⁵N (p > 0.05) in terrestrial organisms, while REE concentrations were negatively correlated with δ¹⁵N (p < 0.05), not δ¹³C (p > 0.05) in aquatic organisms. The result implies diet source and trophic level as key factors affecting the cycling of REEs in terrestrial and aquatic food webs, respectively.

Keywords: BMF; Invertebrate; Rare earth element; TMF; Vertebrate.