Demography of the sessile rotifers, Limnias ceratophylli and Limnias melicerta (Rotifera: Gnesiotrocha), in relation to food (Chlorella vulgaris Beijerinck, 1890) density
Por:
Sarma, S. S. S., Antonio Jimenez-Santos, Marco, Nandini, S., Wallace, Robert L.
Publicada:
1 jul 2017
Categoría:
Aquatic science
Resumen:
We developed a simple method to culture two sessile rotifers, Limnias
ceratophylli and Limnias melicerta, which should be applicable to other
sessile species, and examined effect of the concentration of Chlorella
vulgaris on population growth of these species. Limnias ceratophylli had
higher population abundances at higher food levels. For both species,
intrinsic rate of increase (r), derived from population growth study,
varied from 0.12 to 0.16 day(-1). Differences in r varied depending on
food level for L. ceratophylli, but not for L. melicerta. Both species
had little mortality during 2-3 weeks and thereafter survivorship
declined until 5-7 weeks depending on food concentration. Mean life
expectancy at birth for L. ceratophylli and L. melicerta was 29-34 days
and 28-33 days, respectively. Generation time was shorter for L.
ceratophylli. Gross and net reproductive rates were higher for L.
ceratophylli. For both species, increase in food density resulted in
significant decrease of average lifespan and life expectancy at birth.
Gross reproductive rate and rate of population increase of both species
were not significantly affected by food density. Generation time was
significantly affected due to increase in algal food only for L.
ceratophylli but not for L. melicerta.
Filiaciones:
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, FES Iztacala, Campus Iztacala,Ave Los Barrios 1, Mexico City 54090, DF, Mexico
Antonio Jimenez-Santos, Marco:
Univ Nacl Autonoma Mexico, Postgrad Programme Marine Sci & Limnol, Ciudad Univ,Ave Univ 3000, Mexico City 04510, DF, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Lab Aquat Zool, FES Iztacala, Campus Iztacala,Ave Los Barrios 1, Mexico City 54090, DF, Mexico
Wallace, Robert L.:
Ripon Coll, Dept Biol, Ripon, WI 54971 USA
|