Bioaccumulation and Trophic Transfer of Short‑,
Medium‑, and Long-Chain-Chlorinated Paraffins in Benthic Biotas
of the Haima Cold Seep, South China Sea
posted on 2024-02-16, 06:04authored byLina Lyu, Yu Chen, Kejing Fang, Qinyu Huang, Lin Wang, Zhimao Mai, Jie Li, Si Zhang
The
bioaccumulation and trophic transfer of chlorinated paraffins
(CPs) in deep-sea environments are vital, but no information is currently
available. In the present study, CPs were analyzed in seawater, sediments,
and benthic biotas from the Haima cold seeps, South China Sea. Total
CP concentrations in biota ranged from 264.7 to 12874.4 ng/g of lipid
weight, and their average concentrations, ranked from the highest
to lowest, are as follows: sea cucumber ≈ slim tubeworm >
crab
> brittle star ≈ snail ≈ shrimp ≈ mussel >
clam
≈ giant tubeworm. Benthic biotas displayed high accumulation
abilities for SCCPs, MCCPs, and LCCPs, exhibiting at least medium-level
pollution in the Haima cold seeps. Seawater was considered to be the
primary source of CPs for biotas. Higher bioaccumulation potentials
occurred in nonchemosymbiotic biotas than in chemosymbiotic biotas.
Biomagnification for SCCPs and MCCPs and biodilution for LCCPs were
observed between snails and mussels. No trophic transfer patterns
were found in the whole benthic biota of the Haima cold seeps. This
is the first report of CP bioaccumulation in the deep-sea environment.
The results will provide insights into further studying the biological
trophodynamics and ecological risks of CPs in deep-sea environments.