Life table demography of the rotifer Lecane Tenuiseta under culture conditions, and various age distributions
✍ Scribed by William D. Hummon; Darlene P. Bevelhymer
- Publisher
- Springer
- Year
- 1980
- Tongue
- English
- Weight
- 240 KB
- Volume
- 70
- Category
- Article
- ISSN
- 1573-5141
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✦ Synopsis
The rotifer Lecane tenuiseta, found contaminating an unpolluted culture water reservoir, was cultured in a dilute baker's yeast suspension using the same water. Ova, cultured individually in io µl wells at 20'C, were observed at half day intervals for hatching, daughter ova and death . Data were subjected to life table demographic analyses . With a stable age population of parthenogenic females, laying 6.8 ova per lifetime and increasing at 0 .23 per individual day, mean life expectancy of a newly laid ovum was 26 days, generation time was 8 .4 days and Ii% of the population appeared as developing embryos . With a stationary age population calculated by the Leslie-Ranson method, there would be no change in life expectancy but a decrease in embryos to 9% ; a stationary age distribution calculated by the Hummon method would show a decrease in life expectancy to 4 .9 days and a increase in embryos to 46% . Calculation by the latter method is more consistent with available field data for species of planktonic rotifers .