Population growth and body size in five rotifer species in response to variable food concentration
Por:
Nandini S., Sarma S.S.S., Amador-López R.J., Bolaños-Muñioz S.
Publicada:
1 ene 2007
Resumen:
We cultured five species of rotifers (Brachionus angularis, B. calyciflorus, B. patulus, Euchlanis dilatata, and Lepadella patella) under different algal concentrations (Chlorella vulgaris) for a period of 10 to 15 days, and we derived the rate of population growth per day (r) for each rotifer species. Using a regression between food concentration and the r for each rotifer species, we calculated the minimal food level required to maintain a zero growth rate (threshold food concentration). For all the tested species, there was a direct and positive relationship between food concentration and peak population density. The highest peak density (738 ind. mL-1) was achieved by L. patella at 0.4×106 cells mL-1. At this food density, B. calyciflorus was only able to reach about 10 ind. mL -1. The highest r value (0.46 d-1) was observed for L. patella at 0.4×106 cells mL-1; at this food concentration, B. calyciflorus and E. dilatata had much lower r values (0.21 and 0.23 d-1, respectively). On a dry weight basis, L. patella had the lowest threshold food concentration (0.0023 mg C L-1 d-1), while B. calyciflorus needed much higher levels (2.04 mg C L-1 d-1). Larger-bodied taxa had higher threshold food concentrations than the smaller-bodied rotifers.
Filiaciones:
Nandini S.:
UIICSE, Natonal Autonomous University of Mexico, Campus lztacala CP 54090 Tlalnepantla, Los Reyes AP 314, State of Mexico, Mexico
Sarma S.S.S.:
Laboratorio de Zoología Acuática, Natonal Autonomous University of Mexico, Campus Iztacala CP 54090 Tlalnepantla, Los Reyes AP 314, State of Mexico, Mexico
Amador-López R.J.:
Laboratorio de Zoología Acuática, Natonal Autonomous University of Mexico, Campus Iztacala CP 54090 Tlalnepantla, Los Reyes AP 314, State of Mexico, Mexico
Bolaños-Muñioz S.:
Laboratorio de Zoología Acuática, Natonal Autonomous University of Mexico, Campus Iztacala CP 54090 Tlalnepantla, Los Reyes AP 314, State of Mexico, Mexico
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