Soil suspensions (slurries) are commonly used to estimate the potential of soil microbial communities to mineralize organic contaminants. The preparation of soil slurries disrupts soil structure, however, potentially affecting both the bacterial populations and their protozoan predators. We studied the importance of this "slurry effect" on mineralization of the herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA, (14)C-labelled), focussing on the effects of protozoan predation. Mineralization of MCPA was studied in "intact" soil and soil slurries differing in soil:water ratio, both in the presence and absence of the protozoan activity inhibitor cycloheximide. Protozoan predation inhibited mineralization in dense slurry of subsoil (soil:water ratio 1:3), but only in the most dilute slurry of topsoil (soil:water ratio 1:100). Our results demonstrate that protozoan predation in soil slurries may compromise quantification of contaminant mineralization potential, especially when the initial density of degrader bacteria is low and their growth is controlled by predation during the incubation period.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.envpol.2012.06.013 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Organizing Pneumonia Associated with Pneumocystis jirovecii in a Patient Receiving Dose-Dense Chemotherapy for Breast Cancer: A Case Report.
J Nippon Med Sch
January 2025
Department of Breast Surgery and Oncology, Nippon Medical School Hospital.
In patients not infected by HIV, Pneumocystis jirovecii pneumonia (PCP) is characterized by rapid disease progression, difficulty in confirming the diagnosis, and poor prognosis. PCP has also been reported in immunocompromised patients receiving chemotherapy, most often for hematologic tumors, although some patients receiving treatment for breast cancer have been affected. Dose-dense chemotherapy (DDC) which is performed with shorter dosing intervals than standard chemotherapy and is now widely used in clinical practice.
View Article and Find Full Text PDFChlorine disinfectant significantly changed microfauna habitat, community structure, and colonization mode in wastewater treatment plants.
Appl Environ Microbiol
December 2024
Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.
Unlabelled: During the coronavirus disease 2019 epidemic, excessive chlorine disinfectants have been used to block the spread of severe acute respiratory syndrome-coronavirus 2, resulting in large amounts of residual disinfectants entering wastewater treatment plants (WWTPs) through sewage systems. So far, no relevant research has been conducted on the impact of chlorine disinfectants on microfauna, an important microbial component in activated sludge treatment systems. This study comprehensively investigated the changes in microfauna habitat, community structure, and colonization mode under the chlorine stress by combining the full-scale WWTP survey and laboratory-scale sequencing batch reactor experiments.
View Article and Find Full Text PDFEvidence for the importance of trophically transmitted parasites and predation at the lower latitudes of species ranges.
Proc Biol Sci
December 2024
Scripps Institution of Oceanography-Marine Biology Research Division, University of California San Diego, La Jolla, CA 92037, USA.
The lack of information concerning how parasitism maps onto host geographical distributions represents a striking gap in ecological knowledge. This knowledge gap limits our understanding of a wide range of phenomena, including the consequences of climate change-induced range shifts of both hosts and parasites. To help solve this problem, we created a predictive theoretical framework and quantified latitudinal variation in parasitism by animal and protozoan parasites throughout the entire contiguous geographical ranges of four estuarine fish species.
View Article and Find Full Text PDFMOLECULAR CONFIRMATION OF WOLF (CANIS LUPUS) AS A NATURAL DEFINITIVE HOST FOR SARCOCYSTIS CRUZI OF CATTLE, SARCOCYSTIS MEHLHORNI OF DEER, AND SARCOCYSTIS WENZELI OF CHICKENS.
J Parasitol
December 2024
U.S. Department of Agriculture, Agricultural Research Service, Animal Parasitic Diseases Laboratory, Beltsville Agricultural Research Center, Building 1001, Beltsville, Maryland 20705.
As predators of a wide variety of livestock and wildlife species, wolves (Canis lupus) could serve as definitive hosts for species of Sarcocystis parasites infecting many intermediate hosts. Sarcocystis sporocysts have been observed in the feces of wolves fed infected beef before, but genetic tools have not yet definitively identified which species of parasites they harbor, impairing understanding of their contribution to infections in wild and domesticated intermediate hosts. Therefore, we genetically characterized sporocysts derived from a small sample of naturally infected wolves in Minnesota.
View Article and Find Full Text PDFIncreased pathogen exposure of a marine apex predator over three decades.
PLoS One
October 2024
US Department of Agriculture, Agricultural Research Service, Beltsville, Maryland, United States of America.
Article Synopsis
- Environmental changes due to global warming are increasing the transmission of pathogens and parasites in Arctic wildlife, particularly polar bears, which serve as key indicators of these shifts.
- A study found that the prevalence of several pathogens in Chukchi Sea polar bears increased significantly between two time periods (1987-1994 and 2008-2017), although increased land use in summer by bears did not correlate with higher exposure levels.
- Female polar bears showed higher antibody prevalence for some pathogens, possibly linked to their terrestrial denning habits, and overall findings suggest a need for further research to monitor disease signs in polar bears, which are affected by climate change and serve as a food source for local communities.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!