Polycyclic aromatic hydrocarbons alter the structure of oceanic and oligotrophic microbial food webs
KAUST DepartmentRed Sea Research Center (RSRC)
MetadataShow full item record
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.
CitationCerezo MI, Agusti S (2015) Polycyclic aromatic hydrocarbons alter the structure of oceanic and oligotrophic microbial food webs. Marine Pollution Bulletin 101: 726–735. Available: http://dx.doi.org/10.1016/j.marpolbul.2015.10.004.
SponsorsMinisterio de Economía y Competitividad[CTM2012-32603]
Ministerio de Ciencia e Innovación[CSD2008-00077]
JournalMarine Pollution Bulletin
- PAHs reduce DNA synthesis and delay cell division in the widespread primary producer Prochlorococcus.
- Authors: Cerezo MI, Agustí S
- Issue date: 2015 Jan
- Decrease in the abundance and viability of oceanic phytoplankton due to trace levels of complex mixtures of organic pollutants.
- Authors: Echeveste P, Dachs J, Berrojalbiz N, Agustí S
- Issue date: 2010 Sep
- PAHs sensitivity of picophytoplankton populations in the Red Sea.
- Authors: Kottuparambil S, Agusti S
- Issue date: 2018 Aug
- Cell size dependence of additive versus synergetic effects of UV radiation and PAHs on oceanic phytoplankton.
- Authors: Echeveste P, Agustí S, Dachs J
- Issue date: 2011 May
- Precipitation and temperature drive seasonal variation in bioaccumulation of polycyclic aromatic hydrocarbons in the planktonic food webs of a subtropical shallow eutrophic lake in China.
- Authors: Tao Y, Yu J, Xue B, Yao S, Wang S
- Issue date: 2017 Apr 1