Effect of single species or mixed algal (Chlorella vulgaris and Scenedesmus acutus) diets on the life table demography of Brachionus calyciflorus and Brachionus patulus (Rotifera: Brachionidae)
Por:
Flores-Burgos J., Sarma S.S.S., Nandini S.
Publicada:
1 ene 2005
Resumen:
We tested the effect of two algal diets (Chlorella vulgaris at 1 · 106 cells mL-1 and Scenedesmus acutus at 0.57 · 106 cells mL-1) offered alone or in combination (50% each, 75% or 25% of either alga), at a total dry weight of 14.2 ?g mL-1 on the life table demography of two rotifer species, Brachionus calyciflorus and Brachionus patulus. Data on fecundity indicated that, for any given algal food type or combination of food types, B. calyciflorus had a higher rate of offspring production than B. patulus. Regardless of the rotifer species, the average lifespan varied from 4 to 6 days. The gross and net reproductive rates were higher for B. calyciflorus than for B. patulus. These values ranged from 45 to 71 offspring female-1 lifespan-1 and 15 to 24 offspring female-1 lifespan-1, respectively, for B. calyciflorus. Generation times (around 4...5 days) were similar for both rotifer species in most of the treatments. Whatever the algal food combination, the rate of population increase (d-1) of B. patulus was less than half (i.e. 45%) of that for B. calyciflorus. The observed differences in the life history variables of Brachionus probably explain species-specific adaptations to the changing phytoplankton composition occurring seasonally in natural waterbodies. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Filiaciones:
Flores-Burgos J.:
Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Av. de Los Barrios No. 1, CP 54090 Tlalnepantla, Mexico
Sarma S.S.S.:
Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Av. de Los Barrios No. 1, CP 54090 Tlalnepantla, Mexico
Nandini S.:
UIICSE, Division of Research and Postgraduates Studies, National Autonomous University of Mexico, Av. de Los Barrios No. 1, CP 54090 Tlalnepantla, Mexico
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