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
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 60parts per thousand. 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 degree-days.
Based on field monitoring, Yanchi Saltlake provides
favorable annual conditions of 2884.1 C degree-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).