Details

Autor(en) / Beteiligte

• Song, Xiaojun
• Ding, Jiannan
• Zhang, Yunbo
• Zhu, Mingda
• Peng, Yi
• Wang, Zhenyu
• Pan, Gang
• Zou, Hua

Titel

New insights into changes in phosphorus profile at sediment-water interface by microplastics: Role of benthic bioturbation

Ist Teil von

• Journal of hazardous materials, 2024-05, Vol.469, p.134047-134047, Article 134047

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Microplastics (MPs) have attracted increasing attention due to their ubiquitous occurrence in freshwater sediments and the detrimental effects on benthic invertebrates. However, a clear understanding of their downstream impacts on ecosystem services is still lacking. This study examines the effects of bio-based polylactic acid (PLA), fuel-based polyethylene terephthalate (PET), and biofilm-covered PET (BPET) MPs on the bioturbator chironomid larvae (Tanypus chinensis), and the influence on phosphorus (P) profiles in microcosms. The changes in biochemical responses and metabolic pathways indicated that MPs disrupted energy synthesis by causing intestinal blockage and oxidative stress in T. chinensis, leading to energy depletion and impaired bioturbation activity. The impairment further resulted in enhanced sedimentary P immobilization. For larval treatments, the internal-P loadings were respectively 11.4%, 8.6%, and 9.0% higher in the PLA, PET, and BPET groups compared to the non-MP control. Furthermore, the influence of bioturbation on P profiles was MP-type dependent. Both BPET and PLA treatments displayed more obvious impacts on P profiles compared to PET due to the changes in MP bioavailability or sediment microenvironment. This study connects individual physiological responses to broader ecosystem services, showing that MPs alter P biogeochemical processes by disrupting the bioturbation activities of chironomid larvae. [Display omitted] •MPs caused oxidative stress and metabolic disorder in T. chinensis.•Changes in biochemical endpoints resulted in energy depletion in T. chinensis.•MP-induced behavioral changes of T. chinensis changed P profile.•Mediation for bioturbation-driven process was dependent on MP types.•Biofouling weakened MP-induced bioturbation-driven process of T. chinensis.