Studies on comparative population growth of some species of the rotifer Lecane (Rotifera)
Por:
Serrania-Soto, CR, Sarma, SSS, Nandini, S
Publicada:
1 jul 2011
Resumen:
We compared the population growth patterns of 5 species of the rotifer genus Lecane [(L. quadridentata (Ehrenberg, 1830), L. comuta (Muller, 1786), L. papuana (Murray, 1913), L. unguitata (Fadeev, 1925) and L. pyriformis (Daday, 1905)] ranging in adult average body size from 30 to 140 mu m. All species were cultured under laboratory conditions for 25-30 days using the green alga Scenedesmus acutus as the exclusive diet, at a density of 1.0 X 10(6) cells ml(-1) at 24 degrees C. Regardless of the species, lecanids reached their peak population densities after 4 weeks. Peak population densities ranged from 15 to 320 ind. ml(-1), depending on body size. There was an inverse curvilinear relation between body lengths and peak population abundances (densities) of the Lecane species. Egg ratios (eggs per female) for the tested species were <0.6 during the exponential phase but declined to 0.1 (or lower) as the population density increased. The rates of population increase for the lecanids were
Filiaciones:
Serrania-Soto, CR:
Univ Nacl Autonoma Mexico, Postgrad Programme Biol Sci, Mexico City 04510, DF, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Mexico City, DF, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Mexico City, DF, Mexico
|