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Polycyclic aromatic hydrocarbons alter the structure of oceanic and oligotrophic microbial food webs

AuthorsCerezo, María Isabel ; Agustí, Susana
Oceanic communities
Phytoplankton growth
Microbial food webs
Issue Date6-Nov-2015
CitationMarine Pollution Bulletin 101(2): 726-735 (2015)
AbstractOne way organic pollutants reach remote oceanic regions is by atmospheric transport. During the Malaspina-2010 expedition, across the Atlantic, Indian, and Pacific Oceans, we analyzed the polycyclic aromatic hydrocarbon (PAH) effects on oceanic microbial food webs. We performed perturbation experiments adding PAHs to classic dilution experiments. The phytoplankton growth rates were reduced by more than 5 times, being Prochlorococcus spp. the most affected. 62% of the experiments showed a reduction in the grazing rates due to the presence of PAHs. For the remaining experiments, grazing usually increased likely due to cascading effects. We identified changes in the slope of the relation between the growth rate and the dilution fraction induced by the pollutants, moving from no grazing to V-shape, or to negative slope, indicative of grazing increase by cascade effects and alterations of the grazers' activity structure. Our perturbation experiments indicate that PAHs could influence the structure oceanic food-webs structure.
Publisher version (URL)http://dx.doi.org/10.1016/j.marpolbul.2015.10.004
Identifiersdoi: 10.1016/j.marpolbul.2015.10.004
issn: 1879-3363
Appears in Collections:(IMEDEA) Artículos
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