Combined effects of temperature, food availability and predator's (Asplanchna girodi) allelochemicals on the demography and population growth of Brachionus havanaensis (Rotifera
Por:
Pavon-Meza, EL, Sarma, SSS, Nandini, S
Publicada:
1 ene 2008
Resumen:
We studied the influence of asplanchnin (a non-toxic kairomone from the predator Asplanchna girodi) on the selected populations of prey Brachionus havanaensis cultured at two algal densities (0.5x10(6) cells mL(-1) and 2x10(6) cells mL(-1) of Chlorella vulgaris) and at two temperatures (15 degrees and 25 degrees C). At 15 degrees C, the allelochemicals decreased the survival and offspring production of B. havanaensis at same food levels. Both gross and net reproductive rates were about 50% lower at 15 degrees C than at 25 degrees C. In the absence of asplanchnin, the rate of population increase (r) was highest (0.52 per day) at 25 degrees C under 2 x 10(6) cells mL(-1) of Chlorella. While in the presence of asplanchnin, the r was negative (-0.09 per day) at 15 degrees C, at 0.5 x 10(6) cells mL(-1). At higher temperature and higher food density, life history variables of B. havanaensis did not show adverse impact of asplanchnin. At 15 degrees C under two food levels, B. havanaensis pop
Filiaciones:
Pavon-Meza, EL:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Tlalnepantla 54090, State Of Mexico, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Tlalnepantla 54090, State Of Mexico, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Tlalnepantla 54090, State Of Mexico, Mexico
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