Postembryonic Development Time Research Articles

The effect of temperature on the development, reproduction, and longevity of two common cyclopoid copepods ? Eucyclops serrulatus (Fischer) and Cyclops strenuus (Fischer)

The embryonic and postembryonic development times, time interval between clutches, and longevity of two common cyclopoid copepods — Eucyclops serrulatus and Cyclops strenuus — were studied at constant temperatures (5°, 10°, 15°, 20° and 25 °C), using algae and protozoans as food.

The estimation of secondary production in a natural population of Daphnia hyalina (Leydig) using alternative methods of computation

A single set of population data for Daphnia hyalina was used to estimate production using four methods on a daily and annual basis. Estimates varied from 12.94 to 50.60 g dry weight m-2 y-1. The differences obtained are attributed to faults in the method such as the ignoring of post embryonic development times and poor estimates of basic variables used for the calculations. The latter include poor estimations of specific parts of the population census, particularly egg estimates, and choice of values used for weight estimates and duration times of stages. The normally used birth rate model probably underestimates production whereas the growth increment method probably overestimates production.