Changes in life histories of cladocerans (Cladocera) from the rotifer-mediated allelochemicals
Por:
Sarma, S. S. S., Lopez Rocha, Ana Nayeli, Nandini, S.
Publicada:
8 ago 2020
Resumen:
We hypothesised that at higher densities herbivorous rotifers through
their allelochemicals affect the survival and reproduction of
cladocerans. To test this, we separately cultured three rotifers
(Brachionus calyciflorus, Brachionus havanaensis, and Plationus patulus)
and three cladocerans (Ceriodaphnia dubia, Daphnia pulex, and Moina
macrocopa). Chlorella vulgaris was used as food and reconstituted
moderately hard water was used as medium. The conditioned-medium (CM)
obtained from each of rotifer species was used to conduct cohort life
table tests of cladocerans. SDS PAGE electrophoresis revealed the
molecular weights of proteins present in the rotifer conditioned medium
were 55-63 kDa. Compared to C. dubia and D. pulex, Moina was more
resistant to rotifer-mediated chemicals. Gross reproductive rate of C.
dubia was significantly stimulated by the rotifer-CM. However, gross and
net reproductive rates of D. pulex were strongly reduced (72-85%) due
to P. patulus-CM but not from the other two rotifer species. The rate of
population increase of M. macrocopa was significantly reduced by the
rotifer CM. Overall, about 46% (adverse effect: 24%; stimulatory
impact: 22%) of the life history variables in controls significantly
differed from rotifer-CM treatments, thus proving our hypothesis that
rotifer-mediated allelochemicals had some effect on the cladoceran life
history variables.
Filiaciones:
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Campus Iztacala,Ave Barrios 1, Tlalnepantla 54090, State Of Mexico, Mexico
Lopez Rocha, Ana Nayeli:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Campus Iztacala,Ave Barrios 1, Tlalnepantla 54090, State Of Mexico, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Campus Iztacala,Ave Barrios 1, Tlalnepantla 54090, State Of Mexico, Mexico
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