Relations between mercury fractions and microbial community components in seawater under the presence and absence of probable phosphorus limitation conditions
| Autor: | Milena Horvat, Natalia Bojanić, Yaroslav Shlyapnikov, Branka Grbec, Živana Ninčević Gladan, Grozdan Kušpilić, Ermira Begu, Marin Ordulj, Kristina Obu Vazner, Mladen Šolić, Jože Kotnik, Jere Veža, Frano Matić, Danijela Šantić, Igor Živković, Vesna Fajon, Jelena Lušić, Ana Vrdoljak, Stefanija Šestanović, Slaven Jozić |
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| Jazyk: | angličtina |
| Předmět: |
Chlorophyll a
Environmental Engineering 010504 meteorology & atmospheric sciences Biomagnification chemistry.chemical_element Bioconcentration 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Environmental Chemistry Seawater 14. Life underwater Methylmercury 0105 earth and related environmental sciences General Environmental Science Chemistry Phosphorus General Medicine Mercury Mercury (element) Microbial population biology 13. Climate action Bioaccumulation Environmental chemistry Water Microbiology Water Pollutants Chemical mercury speciation methylmercury probable phosphorus limitation microbial mcommunity Environmental Monitoring |
| Zdroj: | Journal of Environmental Sciences. 75:145-162 |
| ISSN: | 1001-0742 |
| DOI: | 10.1016/j.jes.2018.03.012 |
| Popis: | Microbial transformations of toxic monomethylmercury (MMHg) and dissolved gaseous mercury (DGM) at the lower levels of the marine food web are not well understood, especially in oligotrophic and phosphorus-limited seas. To examine the effects of probable phosphorus limitation (PP-limitation) on relations between mercury (Hg) fractions and microorganisms, we determined the total mercury (THg), total methylated mercury (MeHg), DGM, and microbiological and chemical parameters in the Central Adriatic Sea. Using statistical analysis, we assessed the potential microbial effects on Hg transformations and bioaccumulation. Only in the absence of PP-limitation conditions (NO-PP-limitation) is MeHg significantly related to most chemical and microbial parameters, indicating metabolism-dependent Hg transformations. The heterotrophic activity of low nucleic acid bacteria (abundant in oligotrophic regions) seems responsible for most of Hg methylation under NO-PP-limitation. Under these conditions, DGM is strongly related to microbial fractions and chlorophyll a, indicating biological DGM production, which is probably not metabolically induced, as most of these relations are also observed under PP-limitation. MMHg biomagnification was observed through an increased bioaccumulation factor from microseston to mesozooplankton. Our results indicate that Hg transformations and uptake might be enhanced under NO-PP-limitation conditions, emphasizing their impact on the transfer of Hg to higher trophic levels. |
| Databáze: | OpenAIRE |
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