Allelopathic effects from the macrophyte myriophyllum aquaticum on the population growth and demography of brachionus havanaensis (Rotifera)
Por:
Viveros-Legorreta J.L., Sarma S.S.S., Castellanos Páez M.E., Nandini S.
Publicada:
1 ene 2020
Resumen:
We tested the allelopathic effects of Myriophyllum aquaticum on the survival and reproduction of a common brachionid rotifer, B. havanaensis. Total phenols of the lyophilized conditioned medium (CM) and the extract of M. aquaticum were 0.363 and 1.164 mg g-1 , respectively. We evaluated the demographic response of rotifers to 3- total phenols concentrations (2.0, 5.4 and 12.2 µg g-1 as equivalents of gallic acid) from the extract and three (0.26, 0.53 and 1.06 µg g-1 ) from the CM. Rotifers exposed to total phenols from the extract at concentration of 12.2 µg g-1 did not survive beyond one week. Age-specific survival curves of B. havanaensis showed that those exposed to CM had lower mortality during the first 4 days, but afterwards there was a steep fall in survival. In contrast, those exposed to phenols from the extract, regardless of concentration, had a steep decline in survival, from day one. The reproduction of rotifers in controls was constant (2 offsprings day-1 ) from day 3 -16. In the CM the rotifers produced higher numbers (3-4 day-1 ) of offsprings, but only for a short duration (2-3 days). Depending on the source of allelochemicals, there were significant differences in the response of B. havanaensis in survival and reproduction related parameters. The average lifespan and life expectancy at birth were significantly reduced to 44-50 %, when exposed to allelochemicals from the plant extract or the CM. However, gross and net reproductive rates were affected by 28-32 % in CM, while the effect was more severe (53-65 %) with macrophyte extract. Some stimulatory (hormetic) effect on the rate of population increase per day was observed in treatments with macrophyte medium. © 2020, International Allelopathy Foundation. All rights reserved.
Filiaciones:
Viveros-Legorreta J.L.:
Programa de Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana, Unidad, Xochimilco, Calzada del Hueso 1100, Villa Quietud, Ciudad de México, Coyoacán P.C. 04960, Mexico
Sarma S.S.S.:
Division of Research and Postgraduate Studies, FES Iztacala, Av. de los Barrios No.1, AP 314, Tlalnepantla, P.C. 54090, Mexico
Castellanos Páez M.E.:
Lab. de Rotiferología y Biología Molecular de Plancton, Departamento el Hombre y su Ambiente, Universidad Autónoma Metropolitana, Unidad Xochimilco, Calzada del Hueso 1100, Villa Quietud, Ciudad de México, Coyoacán P.C. 04960, Mexico
Nandini S.:
Division of Research and Postgraduate Studies, FES Iztacala, Av. de los Barrios No.1, AP 314, Tlalnepantla, P.C. 54090, Mexico
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