Diel variation in the egg ratio of rotifers throughout the season (preliminary report)

Ringelberg, J.; Steenvoorden, Jasper

doi:10.1007/bf02270761

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…In the field, Cruz-Pizarro et al (1998) noted that egg production increased during the night in the lakes of Sierra Nevada and that oviposition of amictic eggs by H. bulgarica was also higher in the pelagic zone than in the littoral area. There is some evidence that, if photoperiod is regulated, ERs may vary considerably (Ringelberg & Steenvoorden, 1986) regardless of the adaptation of cultures to light conditions. Ovigerous and non-ovigerous females respond differently to light resulting in different ER at the population level (Magnien & Gilbert, 1983).…”

Section: Influence Of Abiotic and Biotic Factors On The Egg Ratiomentioning

confidence: 98%

Factors Affecting Egg-ratio in Planktonic Rotifers

2005

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EdmondsonÕs egg ratio (number of amictic eggs per female) is an important life history variable, which has been in wide use to understand and predict patterns of population growth in planktonic rotifers under field conditions. It is also useful as an indicator of the health of rotifers under culture conditions. Generally, an inverse relationship exists between the egg ratio and the density of females in a population. A number of abiotic and biotic factors influence the egg ratio. For example, temperature can cause marked changes in the egg ratio by influencing the frequency of egg production and the hatching times of parthenogenetic eggs. Also, preferential feeding on ovigerous females of rotifers by invertebrate predators such as Asplanchna will lower the egg ratios of the population. The easy detachment of eggs, as may be the case in some members of the Brachionidae especially during enhanced reproduction when food levels are high, may also cause an underestimation of the egg ratio. In this review, we discuss the egg ratio of selected rotifer species in relation to the role of diel changes in egg production, the frequency or the intensity of feeding, the problems of distinguishing between different egg types and the negative effect of stressors such as toxicants and diet quality.

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Section: Influence Of Abiotic and Biotic Factors On The Egg Ratiomentioning

confidence: 98%

Factors Affecting Egg-ratio in Planktonic Rotifers

2005

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“…For example, in the shallow waterbodies of the mountainous regions of Central Mexico nighttime temperatures can drop to 5°C and then reach >20°C during the day . Rotifers in these waterbodies may be subject to strong temperature stresses . Therefore, our understanding of the response of rotifers to heavy metal pollution based on studies conducted at constant temperatures may not accurately represent what they experience in nature.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of temperature (level and oscillation) and cadmium concentration on the demography of Brachionus calyciflorus (Rotifera)

Gama-Flores

Huidobro-Salas

Sarma

2014

Internat. Rev. Hydrobiol.

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Here, we report on experiments to determine the effects of sub-lethal concentrations of cadmium (Cd) as CdCl 2 (0.05, 0.1, and 0.2 mg L À1 ) on the life history parameters of Brachionus calyciflorus cultured under two temperature regimes: variable (20-30°C diurnal cycle) and constant (20, 25, or 30°C). Temperature and mode of exposure affected the demographic responses of B. calyciflorus. In general, for B. calyciflorus cultured under constant temperatures and exposed to CdCl 2 the life history variables were more adversely affected than those under the variable temperature regime. Age-specific reproductive output by B. calyciflorus exposed to different temperature regimes under different concentrations of CdCl 2 showed a general pattern of increase in offspring production with increasing age of the cohort for the first 10 days and thereafter declined rapidly. Depending on the temperature regime and Cd concentration, average lifespan, gross reproductive rate, net reproductive rate, generation time, and rate of population increase per day varied from 5 to 8 days, 10 to 38 offspring female À1 , 5 to 16 offspring female À1 , 3 to 5 days, and 0.4 to 1.4 day À1 , respectively. In the absence of the heavy metal, average lifespan and gross and net reproductive rates decreased with increase in fixed temperature range, while generation time and the rate of population increase showed no clear trend with constant temperature regimes. The effect of Cd concentration on life history parameters of B. calyciflorus was generally more severe at extreme temperatures (20 or 30°C) as compared to the fluctuating temperature regime. These results have important implications for aquatic toxicology testing protocols.

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Factors affecting egg-ratio in planktonic rotifers

Sarma

Gulati

Developments in Hydrobiology

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Diel variation in the egg ratio of rotifers throughout the season (preliminary report)

Cited by 5 publications

References 5 publications

Factors Affecting Egg-ratio in Planktonic Rotifers

Factors Affecting Egg-ratio in Planktonic Rotifers

Combined effects of temperature (level and oscillation) and cadmium concentration on the demography of Brachionus calyciflorus (Rotifera)

Factors affecting egg-ratio in planktonic rotifers

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