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Effects of culture medium
and food quantity on the growth, fecundity and longevity of the
cladoceran Daphnia similis Claus
PEDROZO1, C. da S.
& BOHRER1, M.B.C.
1Universidade
Federal do Rio Grande do Sul, Centro de Ecologia.
catarina@ecologia.ufrgs.br
ABSTRACT:
Daphnia
similis
was
maintained in laboratory under constant temperature (20 ± 1 oC). Two different kinds of culture
medium (distilled water and natural water from a
headspring) and food concentrations (1 x 105
cells and 5 x 105 cells mL-1 from a algae solution
of the Chlorophyceae Monoraphidium dybowskii) were tested. The
individuals were daily measured and transferred to a new algal
suspension and individual growth rates, fecundity and longevity of the
animals exposed to the four different treatments were determined.
Headspring water with food concentration of 5 x 105 cells mL-1
of the algae Monoraphidium dybowskii was the treatment that
resulted in the best performance of Daphnia similis at 20 oC
in laboratory conditions. D. similis achieved the highest growth
rate, total egg production and average longevity under this treatment.
Key-words:
Daphnia similis, culture media, growth, longevity, fecundity. |
