Differences in population growth of rotifers and cladocerans raised on algal diets supplemented with yeast
Por:
Peña-Aguado F., Nandini S., Sarma S.S.S.
Publicada:
1 ene 2005
Resumen:
We studied the population growth of two rotifer (Brachionus calyciflorus and Brachionus rubens) and two cladoceran (Ceriodaphnia dubia and Moina macrocopa) species fed three diets (Chlorella vulgaris (Ch), Scenedesmus acutus (Sc) and yeast (Saccharomyces cerevisiae) (Y) in seven combinations (alone or mixed in equal proportions (on dry weight basis): Ch + Sc, Ch + Y, Sc + Y and Ch + Sc + Y). In general, the cladocerans were more adversely affected than the rotifers on the diet of yeast alone. The population growth curves of B. calyciflorus and B. rubens revealed that algal diets were superior to yeast. Regardless of diet, B. rubens had a longer lag phase and delayed peak density compared to B. calyciflorus. Both M. macrocopa and C. dubia had higher peak abundances when fed mixed algae than on either alga offered separately. B. rubens, C. dubia and M. macrocopa reached significantly lower maximal densities on diets containing yeast, S. acutus or both. When the data on the eggs/ female (egg ratio) were plotted as function of population density, we found an inverse relation, which was curvilinear for B. calyciflorus and linear for B. rubens. In general, we found that yeast could effectively supplement algal diets in all the test species, thereby reducing costs in large scale production of zooplankton. © 2005 Elsevier GmbH. All rights reserved.
Filiaciones:
Peña-Aguado F.:
Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Av. De Los Barrios S/N Los Reyes, 54090 Tlalnepantla, State of Mexico, Mexico
Nandini S.:
Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Av. De Los Barrios S/N Los Reyes, 54090 Tlalnepantla, State of Mexico, Mexico
Sarma S.S.S.:
Laboratory of Aquatic Zoology, Edificio UMF, National Autonomous University of Mexico, Av. De Los Barrios S/N Los Reyes, 54090 Tlalnepantla, State of Mexico, Mexico
|