Factors affecting egg-ratio in planktonic rotifers

Sarma, S. S. S.; Gulati, R. D.

doi:10.1007/1-4020-4408-9_37

Cited by 25 publications

(35 citation statements)

References 48 publications

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“…On the other hand, sediments reduced the toxicity of lead to cladocerans (García-García et al, 2006). When a species of zooplankton is grown under nonstressful conditions, then the egg ratio (eggs to females) shows an inverse relation to the population abundance (Sarma et al, 2005). However, under stressful conditions, this relation is disrupted.…”

Section: Discussionmentioning

confidence: 97%

Combined effects of sediment and lead (PbCl2) on the demography of Brachionus patulus (Rotifera: Brachionidae)

García-García¹,

Picazo-Paez

Nandini

2007

Hydrobiologia

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We studied the response of Brachionus patulus to different concentrations of the heavy metal Pb in the presence and absence of sediments. We conducted acute (LC 50 ) and chronic (life table demography and population growth) toxicity tests using sediment levels of 0, 30 and 280 mg l À1 (=0, 17 and 170 NTU) and Pb at 0, 0.06 and 0.6 mg l À1 . Experiments were conducted at 20 ± 1°C on a horizontal shaker and algal food (Chlorella vulgaris) was added at a density of 1.0 · 10 6 cells ml À1 . The median lethal concentration (LC 50 ± 95% Confidence intervals) of PbCl 2 for B. patulus was 6.15 ± 1.08 mg l À1 . Age-specific survivorship and fecundity curves showed increase in turbidity level resulted in decreased survival and offspring production of the rotifers. Increase in Pb concentration too had a negative effect on the survival and reproductive output of B. patulus. Statistically, average lifespan, life expectancy at birth, gross and net reproductive rates and the rate of population increase were all significantly influenced by the concentration of Pb, turbidity level as well as the interaction of Pb concentration · turbidity level. Rotifers exposed to 170 NTU did not grow regardless of the heavy metal concentration in the medium. Similarly, B. patulus exposed to 0.6 mg l À1 Pb did not survive beyond 10 days regardless of the turbidity level in the medium. The rate of population increase of B. patulus derived from the growth experiments was negative in all treatments containing Pb as low as 0.06 mg l À1 or turbidity level as low as 17 NTU. In treatments containing Pb or sediments, there existed no relation between the egg ratio and the population density.

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Section: Discussionmentioning

confidence: 97%

Combined effects of sediment and lead (PbCl2) on the demography of Brachionus patulus (Rotifera: Brachionidae)

García-García¹,

Picazo-Paez

Nandini

2007

Hydrobiologia

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“…Un indicador confiable del estado de salud de los cultivos de rotíferos, es la proporción de huevos por hembra (fecundidad) (Snell et al, 1987). Sarma et al (2005), reportaron que en condiciones sin estrés, la proporción de huevos por hembras puede variar de 0,2-2,5, dependiendo de la especie y el estado de crecimiento de la población. Snell et al (1987) mencionan que si la proporción de huevos por hembra es <0,13 las condiciones del cultivo son adversas, con la consecuente disminución de la población.…”

Section: Discussionunclassified

“…Los trabajos más recientes que describen las tasas de crecimiento, tiempos de duplicación, densidades máximas y fecundidad de diferentes variedades del complejo de Brachionus plicatilis son: Sarma et al, (2005); Hagiwara et al (2007); Yin & Zhao (2008); Viayeh et al (2010) y Jeeja et al (2011). En general, los autores mencionan que las características biológicas varían dependiendo del morfotipo estudiado, por lo que es necesario caracterizar las variedades endémicas para entender su biología y potencial de cultivo.…”

Section: Introductionunclassified

Dinamica poblacional del rotifero Brachionus ibericus aislado de estanques para camaron, alimentado con diferentes dietas

Román‐Reyes¹,

Castañeda-Rodríguez²,

Castillo-Ureta³

et al. 2014

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RESUMEN. La producción de microalgas vivas para cultivar rotíferos constituye uno de los mayores costos de operación en la larvicultura de peces, por lo que se están desarrollando sustitutos comerciales de microalgas para la alimentación y producción de rotíferos. Se desconoce el efecto que tienen las formulaciones comerciales sobre la dinámica poblacional de rotíferos nativos del noroeste de México y en este estudio se evaluó el efecto de cuatro dietas comerciales (Espirulina, RotiMac®, Nanno 3600®, RotiGrow-Plus®) y la microalga viva Nannochloropsis sp., sobre el crecimiento poblacional y fecundidad del rotífero Brachionus ibericus (GenBank KJ949043), aislado de una granja de camarón blanco (Litopenaeus vannamei). Se realizaron cinco réplicas por tratamiento alimenticio utilizando recipientes con volumen de 12 L de agua, con temperatura de 29 ± 1°C y salinidad de 35 ± 1, respectivamente. Los resultados mostraron que durante los periodos experimentales, las dietas probadas resultaron adecuadas para alimentar a B. ibericus, con tasas de crecimiento, tiempos de duplicación, densidades máximas y fecundidades que fluctuaron entre 0.20 a 0.27 rotíferos día , respectivamente. Las diferencias entre tratamientos fueron significativas (P < 0.05); los menores tiempos de duplicación y las mayores tasas de crecimiento, fecundidad y densidad poblacional fueron obtenidas con RotiGrow-Plus ® , pero el tiempo de duplicación y la tasa de crecimiento con RotiGrow-Plus ® no fueron significativamente diferentes (P > 0.05) a las obtenidas con Nanno 3600 ® .Palabras clave: Brachionus ibericus, Nannochloropsis, rotíferos, dinámica poblacional, dietas comerciales. Population dynamics of rotifer Brachionus ibericus isolated from shrimp ponds, fed with different dietsABSTRACT. The production of live microalgae to cultivate rotifers is one of the largest operating costs in fish hatcheries. Commercial substitutes of microalgae are being developed to feed and produce rotifers. The effect of commercial formulations on the population dynamics of native rotifers of northwestern Mexico is unknown, so in this study the effect of four commercial diets (Spirulina, RotiMac®, Nanno 3600®, RotiGrow-Plus®) was evaluated as well as the live macroalgae Nannochloropsis sp., on the population growth and fecundity of the rotifer Brachionus ibericus (GenBank KJ949043), isolated from a white shrimp farm (Litopenaeus vannamei). Five replicates per dietary treatment were performed using 12 L containers with temperature of 29 ± 1°C and salinity of 35 ± 1 respectively. The results showed that during the experimental period, the diets tested were suitable to feed B. ibericus, with mean growth rates, duplication times, maximum densities and fecundities that ranged from 0.20 to 0.27 rotifers day-1, 2.60 to 3.42 days, 0.16 to 0.39 eggs per female and 215.4 to 357.0 rotifers mL -1 , respectively. Differences between treatments were significant (P < 0.05); lower doubling times and higher growth rates, fecundities and population densities were obtained with RotiGrow-P...

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“…Although morphometric parameters of S. vetulus were not measured, it has a smaller body size than S. mucronata. Smaller taxa are generally numerically more abundant than larger species (Cowgill, 1987;Sarma et al, 2005). According to Ranta (1979) and Black and Dodson (1990), Daphnia magna, the largest daphnid, can resist high salinity levels, as it was one of the most resistant among cladocerans to salinity increase.…”

Section: Life History Parametersmentioning

confidence: 99%