ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Jingjing Du,Tianying Tao,Mengxi Gao,Xueting Zhang,Xilin Wang,Qian Zhang,Yuanqian Xu,Baodan Jin,Lan Wang,Xia Cao
Nanoplastics pose a potential threat to a wide variety of aquatic organisms . Despite the awareness of this existing hazard, the impact of nanoplastics on natural fungal communities remains a research gap. In this study, five dominant fungi species, isolated from a stream ecosystem, were used to explore the effects of different nano-polystyrene (nano-PS) particles concentrations on a simulated fungal community. Specifically, the evaluation was conducted regarding the fungal growth , reproductivity, structural composition, and ecological function in leaf litter decomposition. A 15-day exposure experiment showed that 100 μg/L nano-PS significantly reduced the microcosm pH. The extracellular enzyme activities of β-glucosidase, leucine-aminopeptidase, and peroxidase were significantly promoted by nano-PS exposure for 5 days or 15 days. Total sporulation rate significantly decreased after the 15-day exposure to 1 and 100 μg/L nano-PS and significantly increased under 10 μg/L nano-PS. In contrast, nano-PS concentrations had no effects on fungal biomass . In addition, the reduced relative abundance of Geotrichum candidum lowered its contribution to leaf decomposition, resulting in a decreased litter decomposition rate of a 24.5–27.9 % after exposure. This suggests that 1–100 μg/L nano-PS inhibited leaf decomposition by inhibiting fungal reproduction and reducing the contribution of specific fungal species. In addition, the findings highlight the importance of exploring the potential mechanisms of the interaction between nanoplastics and fungal species.
研究领域:
生态学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Jingjing Du,Xilin Wang,Tianying Tao,Yan Su,Xueting Zhang,Jing Shao,Yufan Zhang,Luyao Yu,Baodan Jin,Wenrui Qv,Xia Cao,Lan Wang,Yanqin Yang
Polystyrene nanoparticles (PS NPs) released from plastic products have been demonstrated to pose a threat to leaf litter decomposition in streams. Given the multitrophic systems of species interactions, the effects of PS NPs through different exposure routes on ecosystem functioning remain unclear. Especially dietary exposure, a frequently overlooked pathway leading to toxicity, deserves more attention. A microcosm experiment was conducted in this study to assess the effects of waterborne and dietary exposure to PS NPs on the litter-based food chain involving leaves, microbial decomposers , and detritivores (river snails). Compared to waterborne contamination, dietary contamination resulted in lower microbial enzyme activities and a significantly higher decrease in the lipid content of leaves. For river snails, their antioxidant activity was significantly increased by 20.21%–69.93%, and their leaf consumption rate was significantly reduced by 16.60% through the dietary route due to the lower lipid content of leaves. Besides, the significantly decreased nutritional quality of river snails would negatively influence their palatability to predators. The findings of this study indicate that dietary exposure to PS NPs significantly impacts microbial and detritivore activities, thus affecting their functions in the detritus food chain as well as nutrient cycling.
研究领域:
生态学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2021
·Vol. 9
·期 1
·133-144
·
IF 8.131
Jingjing Du,Wenrui Qv,Gaozhong Pu,Mingxiang Qv,Jin Zhang,Wenfang Zhang,Hongzhong Zhang
Most intensively studied nanoparticles (NPs) possess photocatalytic activity. However, knowledge of the ecotoxicity of TiO2 NPs in response to the natural photoperiod remains scarce. To increase our understanding of the phototoxicity of TiO2 NPs toward aquatic fungal communities, regarding their structure and functioning, a microcosm experiment was conducted involving narrow-leaf cattail (Typha angustifolia) leaf decomposition with TiO2 NPs (50 mg L−1) under different light conditions (visible light, UV light, and the natural photoperiod) for 214 days. Although different light conditions led to significant variations in leaf decomposition, the decomposition rate was not significantly affected by TiO2 NP exposure under either visible or UV light, and it even increased by 15.19% under the natural photoperiod. During the ecological process, significant decreases were observed in the fungal biomass, overall microbial activity, and some extracellular enzymatic (cellobiohydrolase and polyphenol oxidase) activities. Also, TiO2 NPs under visible light and UV light reduced the fungal community diversity and led to the selection of some tolerant fungal species (e.g., Anguillospora longissima) that performed poorly in leaf decomposition under chronic exposure. The information provided here will help us to deeply evaluate the ecotoxicity of nanoparticles on freshwater ecosystem functioning under ambient light conditions.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 9
·1295
·
IF 3
Hualong He,Sulin Cai,Siyuan Chen,Qiang Li,Yunchao Luo,Xiaoyi Zeng,Rumeng Ye,Pengwei Wan,Xingjun Tian
This study investigates the combined effect of microplastics and cadmium on the decomposition of litter, the structure of fungal communities, and the feeding behavior of invertebrates in an aquatic ecosystem. Through a series of microcosm experiments, we demonstrate that exposure to MPs and Cd significantly reduced the decomposition of leaf litter. Notably, the cumulative impact of combined MP and Cd exposure was found to be greater than their individual effects. During this process, the carbon–nitrogen ratio of the litter increased, while dehydrogenase activity and fungal biomass were inhibited. Additionally, the relative abundance of Ascomycota and Basidiomycota fungi decreased, weakening their role in the decomposition of leaf litter. Conversely, MPs and Cd reduced the relative content of leaf litter lignin, improving its quality as food, thereby leading to an increase in the feeding rate of invertebrates. This dual effect indicates that micropollutants suppress the decomposition of litter by regulating microbial metabolic activity and fungal community structure but promote invertebrate feeding. Our findings provide crucial insights into the adverse effects of MPs and Cd on the structure and diversity of aquatic fungal communities, which could have long-term impacts on the food webs and nutrient cycling progress of aquatic ecosystems.
研究领域:
水生生态学
·
环境科学
·
微生物学
·
生态毒理学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）