Recovery of Soil Protozoan Community Structure Promoted by M. sativa After a Strong Pulse of Hydrocarbon Contamination
Por:
Mondragon-Camarillo, Laura, Zaragoza, Salvador Rodriguez, Mendoza-Lopez, Ma. Remedios, Cabirol, Nathalie, Macek, Miroslav
Publicada:
1 jun 2020
Resumen:
The response of soil microbiota to hydrocarbon contamination has been
studied normally several months after the event. However, as those
studies represent a ``long-term'' context for microbial processes,
since protozoa succession can be achieved after 28 days, we wonder how
fast does trophic structure of ciliates and flagellates recover from a
strong pulse of petroleum contamination under the influence of Medicago
sativa. We hypothesized that the root effect of M. sativa would promote
faster recovery of the protozoan trophic structure, in comparison with
the level reached in unplanted microcosms. The abundances of
individuals, species, and trophic groups of ciliates and flagellates
were determined at 1, 7, 14, and 30 days after a single pulse of 50,000
ppm of light petroleum on soil microcosms unplanted and planted with M.
sativa, and their respective controls. Protozoan diversity and trophic
groups were strongly reduced immediately after the pulse of
contamination. Ciliates and flagellate trophic diversity increased
steadily in all microcosms after 7 days. However, unplanted contaminated
and planted contaminated microcosms remained the poorest communities and
reached full recovery of trophic groups after 30 days. Also, the
protozoan communities were segregated into 2 groups: the first from
petroleum and the second formed by non-polluted microcosms. These
results suggest that petroleum is a strong selection factor leading to
an alternative protozoan community composition and the root effect of M.
sativa promotes faster recovery of ciliate and flagellate communities
after a devastation produced by a strong pulse of petroleum
contamination.
Filiaciones:
Mondragon-Camarillo, Laura:
Univ Nacl Autonoma Mexico, FES Iztacala, UBIPRO, Lab Microbiol, Ave Barrios 1 Col Los Reyes Iztacala, Mexico City 54090, DF, Mexico
Zaragoza, Salvador Rodriguez:
Univ Nacl Autonoma Mexico, FES Iztacala, UBIPRO, Lab Microbiol, Ave Barrios 1 Col Los Reyes Iztacala, Mexico City 54090, DF, Mexico
Mendoza-Lopez, Ma. Remedios:
Univ Veracruzana, SARA, Ave Dr Luis Castelazo S-N, Xalapa 91000, Veracruz, Mexico
Cabirol, Nathalie:
Univ Nacl Autonoma Mexico, Fac Ciencias, Dept Ecol & Recursos Nat, Mexico City, DF, Mexico
Macek, Miroslav:
Univ Nacl Autonoma Mexico, FES Iztacala, UIICSE, Ave Barrios 1 Col Los Reyes Iztacala, Mexico City 54090, DF, Mexico
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