Contrasting sensitivity among oligotrophic marine microbial communities to priority PAHs
Autor: | Susana Agusti, Ananya Ashok |
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Rok vydání: | 2022 |
Předmět: |
Synechococcus
Chlorophyll Environmental Engineering Microbiota Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health General Medicine General Chemistry Complex Mixtures Pollution Nucleic Acids Environmental Chemistry Polycyclic Aromatic Hydrocarbons Indian Ocean Water Pollutants Chemical |
Zdroj: | Chemosphere. 309:136490 |
ISSN: | 0045-6535 |
Popis: | Oligotrophic areas represent a large proportion of the oceans, wherein microbial food webs largely determine carbon flux dynamics and biogeochemical cycles. However, little is known regarding the sensitivity of microbial planktonic communities to pollutants in such areas. Organic pollutants such as polycyclic aromatic hydrocarbons (PAH/s) are toxic oil derivatives that occur as complex mixtures and reach marine environments through different sources. Therefore, our study analyzed the PAH tolerance of natural photosynthetic and heterotrophic bacteria and eukaryotes from the oligotrophic Red Sea, which is uniquely susceptible to high oil contamination. Natural communities sampled from the surface layer were exposed to a concentration gradient of a mixture of 16 priority PAHs at in situ conditions for 48 h. The populations of the dominant picocyanobacteria Synechococcus sp., picophytoeukaryotes, and low nucleic acid (LNA) bacteria decreased upon exposure to PAHs in a strong dose-dependent manner. Chlorophyll-a, which was measured as an indicator of the total autotrophic community response, also decreased substantially. High nucleic acid (HNA) bacteria, however, exhibited lower growth inhibition (50%). The lethal concentration (LC |
Databáze: | OpenAIRE |
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