Studies on some biological aspects of Simocephalus vetulus SchÖdler

Y R MALHOTRA, SEEMA LANGER

Abstract


A study of the life cycle of a daphnid cladoceran, Simocephalus vetulus (life span. number and duration of instars, egg production, growth and embryonic development of the organism at two different seasonal temperatures (13-15 and 28-30°C) shows that it produces the maximum number of eggs (about 335) at low temperature in the optimum range (13-15°C) during a mean life span of 65-67 days. At both seasonal temperatures, it has four (sometimes five) pre-adult and ten adult instars. Embryonic development too is strongly temperature related.

Keywords


Simocephalus vetulus; biology; temperature variations.

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