Article
Engineering, Civil
Fan Xia, Zaihua Liu, Min Zhao, Haibo He, Qiufang He, Chaowei Lai, Xuejun He, Zhen Ma, Yang Wu, Song Ma
Summary: This study investigated the burial process of recalcitrant dissolved organic matter (RDOM) in Erhai lake, China, and found that autochthonous organic matter plays a significant role in the lake's carbon sink. It provides a new perspective for studying the stability of autochthonous organic matter and highlights the importance of studying carbon sinks in inland lakes.
JOURNAL OF HYDROLOGY
(2023)
Article
Microbiology
Bethany G. Fox, Robin M. S. Thorn, Darren M. Reynolds
Summary: This study investigates the origin and range of fluorescent organic matter (FOM) produced by environmentally sourced freshwater bacteria, challenging the binary classification of FOM as either autochthonous or allochthonous. The study demonstrates that FOM processing and production occur along a dynamic continuum, with both in-situ production by microbial processes and transportation into aquatic systems from external sources. Additionally, fluorescence intensity data for environmental bacteria isolate monocultures are presented for the first time, allowing for the assessment of the relative contribution of different bacteria to the autochthonous FOM pool.
Article
Environmental Sciences
Bo Shao, Zhike Li, Zhengyu Wu, Ning Yang, Xiaoyu Cui, Huiming Lin, Yiwen Liu, Wei He, Yingxin Zhao, Xuejun Wang, Yindong Tong
Summary: The bioaccumulation of MeHg in pelagic food webs is influenced by dissolved organic matter (DOM), with elevated concentrations of DOM and phytoplankton biomass affecting MeHg uptake by phytoplankton and resulting in more significant biomagnification in zooplankton.
ENVIRONMENTAL POLLUTION
(2023)
Article
Ecology
S. J. Taipale, C. Rigaud, M. L. Calderini, M. J. Kainz, M. Pilecky, S. Uusi-Heikkila, J. S. Vesamaki, K. Vuorio, M. Tiirola
Summary: This study examines the contribution of mixotrophic organisms and the fate of carbon in the food web using labeled materials. It finds that mixotrophic algae can upgrade simple fatty acids and contribute essential biomolecules to higher trophic levels.
Article
Marine & Freshwater Biology
Tiphaine Labed-Veydert, Apostolos-Manuel Koussoroplis, Alexandre Bec, Christian Desvilettes
Summary: The study suggests that organic matter sources in forested headwater streams mainly come from biofilm, bryophytes, and fine benthic detrital particles, rather than leaf litter. Additionally, it highlights the significant contribution of autochthonous organic matter to the development of stream macroinvertebrates, especially in providing long-chain PUFAs.
Article
Engineering, Environmental
Fan Xia, Zaihua Liu, Min Zhao, Qiang Li, Dong Li, Wenfang Cao, Cheng Zeng, Yundi Hu, Bo Chen, Qian Bao, Yi Zhang, Qiufang He, Chaowei Lai, Xuejun He, Zhen Ma, Yongqiang Han, Haibo He
Summary: The research indicates that Auto-DOM in karst ecosystems may be an important carbon sink, often overlooked as it is believed to be easily mineralized by planktonic bacteria. The fluorescence component C2 of CDOM may possess characteristics of RDOM and serve as a significant source of DOM in karst aquatic ecosystems. Additionally, high concentrations of Ca2+ and dissolved inorganic carbon (DIC) in karst ecosystems were found to impact certain planktonic bacterium and functional genes.
Article
Environmental Sciences
Paulina Montero, Martina Coppari, Federico Betti, Giorgio Bavestrello, Giovanni Daneri
Summary: Aulacomya atra is an important suspension feeder in the benthic communities of the Chilean Patagonia fjords, utilizing both autochthonous and allochthonous organic matter, with higher ingestion rates observed in individuals fed with salmon food pellets during feeding experiments. The stable isotope analysis indicates a preference for phytoplankton carbon in their diet, suggesting limited utilization of terrestrially derived organic matter.
FRONTIERS IN MARINE SCIENCE
(2021)
Review
Biodiversity Conservation
Juliana S. Leal, Angelica L. Gonzalez, Bruno E. Soares, Clarice Casa Nova, Nicholas A. C. Marino, Vinicius F. Farjalla
Summary: The quantity and source of organic matter play a crucial role in determining the energy flow in freshwater food webs. Allochthonous material is the main resource for freshwater consumers, while autochthonous OM can also contribute to aquatic communities due to its higher nutritional quality. Through a meta-analytical approach, we found that the relative importance of allochthonous and autochthonous OM varies depending on environmental factors, with lotic systems being more influenced by autochthonous OM.
Article
Engineering, Environmental
Alexis P. Roodt, Nina Roeder, Sebastian Pietz, Sara Kolbenschlag, Alessandro Manfrin, Klaus Schwenk, Mirco Bundschuh, Ralf Schulz
Summary: Emerging aquatic insects have the potential to retain and transfer aquatic contaminants into terrestrial food webs. This study found that nonbiting midge larvae exposed to a mixture of fungicides and herbicides retained the pesticides through metamorphosis, with higher concentrations in females. The results suggest a potential dietary exposure to these pesticides for tree swallow nestlings and insectivorous bats.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Tao Hu, Jiachao Zhang, Xueyan Xu, Xiaoli Wang, Changzhi Yang, Chao Song, Shuguang Wang, Shan Zhao
Summary: Antibiotic pollution is a common problem in the wetland of the Yellow River Delta caused by aquaculture industries. This study investigated the occurrence, bioaccumulation, and trophic transfer of antibiotics in the aquatic and terrestrial food webs of the YRD, and discussed the effects of physicochemical parameters on their behavior. The results showed that fluoroquinolones had the highest bioaccumulation capacity and the antibiotics were biodiluted in the aquatic food web while biomagnified in the terrestrial food web. Physicochemical parameters such as log Kow/log Dow and log Koa were found to be good predictors for antibiotic bioaccumulation in different organisms.
Article
Engineering, Environmental
Dingyuan Liang, Wenhong Fan, You Wu, Ying Wang
Summary: The influence of natural organic matter (NOM) on the behavior and toxicity of silver nanoparticles (Ag NPs) along the food chain was investigated in this study. The results showed that NOM could reduce the toxicity of Ag NPs to bacteria and protozoa by different mechanisms. Furthermore, Ag NPs could be transferred and biomagnified to protozoa through trophic transfer.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Ecology
Matthew J. Balzer, James N. Hitchcock, Wade L. Hadwen, Tsuyoshi Kobayashi, Douglas P. Westhorpe, Craig Boys, Simon M. Mitrovic
Summary: There is ongoing debate about the importance of allochthonous dissolved organic matter (DOM) during large flow events in riverine food webs. A mesocosm experiment was conducted to examine the effects of floodplain DOM on the lower food web in an Australian lowland river. The results showed that the addition of tDOM led to increases in zooplankton and mixotrophic algae, and mixotrophs played a significant role in driving changes in primary consumer growth and supporting secondary production.
FRESHWATER BIOLOGY
(2023)
Article
Energy & Fuels
Adam Zakrzewski, Marta Waliczek, Pawel Kosakowski, Krzysztof Jurek, Irena Matyasik
Summary: A set of 24 core samples from the Lower Keuperian and Grabfeld Formation in the Polish Basin were analyzed using geochemical and petrological methods. The results showed that the organic matter in the samples is mostly mature/overmature. The presence of allochthonous organic matter influenced some geochemical indicators and indicated the presence of a fluvial-deltaic paleoenvironment. The degree of organic matter diagenetic oxidation was determined using various ratios based on phenanthrene, methylphenanthrenes, and aromatic ketones.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Review
Environmental Sciences
Bin Hu, Peifang Wang, Chao Wang, Tianli Bao
Summary: This study provides a systematic overview of the photogeochemistry of particulate organic matter (POM) in aquatic environments, focusing on photodissolution and photo induced flocculation processes. Photodissolution can alter the bioavailability of organic matter and impact the biogeochemical cycling of nutrients, heavy metals, and organic pollutants; while photo induced flocculation may influence the transport and transformation of organic matter and associated pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biodiversity Conservation
Giovanna Collyer, Daniel M. Perkins, Danielle K. Petsch, Tadeu Siqueira, Victor Saito
Summary: Land-use and land-cover transitions have various effects on biodiversity and ecosystem functioning, including energy transfer within food webs. Our study examined changes in the size spectrum of aquatic macroinvertebrates along a land-use intensification gradient in Brazilian streams. We found that disturbed streams had fewer small organisms but more efficient energy transfer compared to pristine forest streams. Despite this efficiency, disturbed streams had lower taxonomic diversity and supported fewer large organisms and shorter food chains.
GLOBAL CHANGE BIOLOGY
(2023)
