Microcystis extracts and single cells have differential impacts on the demography of cladocerans: a case study on Moina cf. micrura isolated from the Mediterranean coastal shallow lake (L'Albufera, Spain)
Por:
Nandini S., Miracle M.R., Vicente E., Sarma S.S.S., Gulati R.D.
Publicada:
1 sep 2017
Categoría:
Aquatic science
Resumen:
Cyanobacteria often have a deleterious effect on zooplankton. We
hypothesized that the presence of either M. aeruginosa cells or
microcystin extracts from M. aeruginosa would have a significant impact
on the population growth rate, survivorship, and fecundity of Moina cf.
micrura isolated from L'Albufera, Valencia, Spain. The cladocerans were
exposed to different concentrations of Microcystis extracts on a diet of
Nannochloris oculata (Chlorococcales) as well as different proportions
of Microcystis single cells and N. oculata. Cyanotoxins were extracted
from a Microcystis bloom by its repeated freezing, thawing, and
sonication. Total microcystin concentration was 138.2 A mu g l(-1). M.
aeruginosa single cells were obtained by sonication. We used five
microcystin concentrations (from 4.3 to 69.1 A mu g l(-1) and controls
without microcystins) with non-toxic Nannochloris oculata at 0.5 x 10(6)
cells ml(-1) as diet or on different proportions of M. aeruginosa single
cells and N. oculata. Microcystin reduced generation time and longevity
of M. cf. micrura but increased daily production of offspring.
Single-celled Microcystis (100%) diet for Moina cf. micrura decreased
growth rates compared with treatments using cyanotoxin extracts. We
suggest routine testing of cyanobacterial crude extracts using plankton
to estimate harmful impacts of blooms especially for drinking water
reservoirs.
Filiaciones:
Nandini S.:
Laboratorio de Zoología Acuática, División de Investigación y Posgrado, Universidad Nacional Autónoma de México, Campus Iztacala, Av. de los Barrios # 1, Los Reyes Iztacala, Tlalnepantla, Estado de México 54090, Mexico
Miracle M.R.:
Department Microbiologia i Ecologia & ICBiBE, Universitat de València, Burjassot (Valencia), 46100, Spain
Vicente E.:
Department Microbiologia i Ecologia & ICBiBE, Universitat de València, Burjassot (Valencia), 46100, Spain
Sarma S.S.S.:
Laboratorio de Zoología Acuática, División de Investigación y Posgrado, Universidad Nacional Autónoma de México, Campus Iztacala, Av. de los Barrios # 1, Los Reyes Iztacala, Tlalnepantla, Estado de México 54090, Mexico
Gulati R.D.:
Department of Aquatic Ecology, NIOO/Netherlands Institute of Ecology, Wageningen, 6708 PB, Netherlands
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