Agricultural and Biological Sciences: Aquatic Science
; Earth and Planetary Sciences: Oceanography
; Environmental Science: Pollution
英文摘要:
Microplastics (MPs) are prevalent in marine ecosystems. Because toxicants (termed here “co-contaminants”) can sorb to MPs, there is potential for MPs to alter co-contaminant bioavailability. Our objective was to demonstrate sorption of two co-contaminants with different physicochemistries [phenanthrene (Phe), log10Kow�=�4.57; and 17α-ethinylestradiol (EE2), log10Kow�=�3.67] to MPs; and assess whether co-contaminant bioavailability was increased after MP settlement. Bioavailability was indicated by gene expression in larval zebrafish. Both Phe and EE2 sorbed to MPs, which reduced bioavailability by a maximum of 33% and 48% respectively. Sorption occurred, but was not consistent with predictions based on co-contaminant physicochemistry (Phe having higher log10Kow was expected to have higher sorption). Contaminated MPs settled to the bottom of the exposures did not lead to increased bioavailability of Phe or EE2. Phe was 48% more bioavailable than predicted by a linear sorption model, organism-based measurements therefore contribute unique insight into MP co-contaminant bioavailability. � 2016 The Authors
School of Marine Science and Engineering, Marine Biology and Ecology Research Centre, University of Plymouth, Plymouth, United Kingdom; British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, United Kingdom; Institute of Life and Earth Sciences, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, United Kingdom; Petroleum and Environmental Geochemistry Group, School of Geography Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, United Kingdom; School of Earth & Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth, United Kingdom; Center for Environmental Biotechnology, University of Tennessee, Knoxville, TN, United States; Department of Forestry, Wildlife and Fisheries, University of Tennessee, Knoxville, TN, United States
Recommended Citation:
Sleight V.A.,Bakir A.,Thompson R.C.,et al. Assessment of microplastic-sorbed contaminant bioavailability through analysis of biomarker gene expression in larval zebrafish[J]. Marine Pollution Bulletin,2017-01-01,116(2018-01-02)