Laboratory studies on the
influence of temperature on the reproductive potential of Artemia sinica Cai
(Crustacea : anostraca) from Yanchi Saltlake, China
Q.X. Jia, N. Xu, J. Zhu, M.P. Zheng-2002
Journal of Freshwater Ecology, 17(3): 467-473
(from Current Contents)
Abstract :
The effects of temperature on population
characteristics of Artemia sinica Cai from Yanchi Saltlake, Shanxi province,
China, were studied in the laboratory at a salinity of 60 ppt. The
developmental stages and generation time were dramatically shortened with
increasing water temperature between 16°C and 34°C. Hatching and survival
rates decreased rapidly above 30°C. The optimum temperature for
reproduction and population growth was 26-28°C. The threshold temperatures
for hatching of eggs and development of larvae were 9.07°C and 11.00°C,
respectively. The effective cumulative temperature for a generation (time x
temperature required from hatching to death) was 458.4+/-39.6 C °-days.
Based on field monitoring, Yanchi Saltlake provides favorable annual
conditions of 2884.1 C °-days, which would support an estimated 6.3+/-0.5
A. sinica generations,per year. The intrinsic and finite rates of population
increase were both increased with adapted water temperature. Extrapolating
this data to Yanchi Saltlake, the period from the middle of May to September
(second to fifth A. sinica generations) would be the most productive, with a
generation time of < 42 d, a population doubling time of < 15 d, a
finite rate of increase of > 1.0 d(-1), and an intrinsic rate of natural
increase of > 0.04 d(-1).
(Chinese Acad Geol Sci; Open Lab Saline Lake
Resources & Environm; 26 Baiwanzhuang Rd; Beijing 100037; PR China)