Laboratorio de Hidrobiologia Experimental. Escuela
de Ciencias Biol?gicas, I.P.N. Carpio
Esq. Plan de Ayala s/n, Col. Sto. Tom?s, M?xico, D. F. 11340, Mexico
Laboratorio de Hidrobiologia Experimental. Escuela Nacional de
Esq. Plan de Ayala s/n, Col. Sto.
D.F. 11340, Mexico
24 September 2010
The knowledge of population
effects of food on tropical, filter-feeding cladocerans
is scarce because a reduced number of species has been extensively studied. Ceriodaphnia rigaudi
1894, a small-sized cladoceran distributed mainly
in tropical and subtropical regions of the world, was studied. The aim of
this study was to contribute to the knowledge of the reproductive biology of
a poor-known Cladoceran; for this we assessed the
effect of feeding and temperature on the reproduction and life cycle of this
species. Three microalga species (Pseudokirchneriella subcapitata,
and Chlorella vulgaris) were supplied as
food each at a concentration of 12 mg l-1 (dry weight, equivalent
to 1.3X106, 0.4X106 and 1.35X106 cell ml-1,
respectively, and equivalent to 7.80 ?g C ml-1), at two
temperatures (20 and 25oC). We evaluated, among other responses,
longevity, total progeny, survival, life expectancy at birth and fecundity.
Organisms fed with the microalgae A. falcatus and P. subcapitata
presented both higher longevity (30.7? 5.91, 26.6 ? 3.59 days,
respectively) and total progeny (45 ? 13.80, 40.7 ? 0.66 neonates female-1)
values than those organisms fed C. vulgaris
(13.5? 4.63 days and 17.6 ? 6.19 neonates female-1, respectively).
On the other hand, temperature affected significantly the population
parameters of C. rigaudi, recording maximal
longevity values (56.1 ? 9.41 days) at 20oC in organisms fed A.
falcatus; however, age at first reproduction
and total progeny were negatively affected by this temperature: sexual
maturation of the females was delayed until the age of 16 days and the number
of neonates produced was smaller (9.8 ? 3.45 with C. vulgaris;
24.7?6.01 with P. subcapitata, and 35.5
? 8.59 neonates female-1 with A. falcatus).
The best reproductive responses for C. rigaudi
in this study were obtained with A. falcatus
Life table, zooplankton culture, Pseudokirchneriella subcapitata, Ankistrodesmus falcatus, Chlorella vulgaris