The estimation of secondary production in a natural population ofDaphnia hyalina(Leydig) using alternative methods of computation
✍ Scribed by T. E. Andrew
- Publisher
- Springer
- Year
- 1983
- Tongue
- English
- Weight
- 885 KB
- Volume
- 107
- Category
- Article
- ISSN
- 1573-5141
No coin nor oath required. For personal study only.
✦ Synopsis
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 .