Abstract: The effects of different algae (Chlorellavulgaris,Microcystisaeruginosa469,Microcystisaeruginosa905 andAnabaenacylindrica170) as food on population dynamics of water fleasDaphniahyalinewere investigated at constant water temperature of 20 ℃ in a lab. The water fleas fedC.vulgarishad good growth in population density, with maximal population density (MPD) of (211.22±7.22) ind./L and the maximal growth rate (MGR) of 1.468 ind./d. The water fleas fedM.aeruginosa469 showed MPD of (133.75±4.84) ind./L, only half of that of the water fleas fedC.vulgaris. The water fleas fedM.aeruginosa905 andA.cylindrica170, however, had poor growth in population density,with MPD of (50.75±4.38) ind./L and MGR of 0.424 ind./d in the animals fedM.aeruginosa905 and MPD of(70.00±5.69) ind./L and MGR of 0.405 ind./d in the animals fedA.cylindrica170. The logistic growth equations were expressed asN=27.689/[1+e20.141-0.212t] (R2=0.989)for the water fleas fedC.vulgaris,N=15.094/[1+e17.659-0.273t] (R2=0.988) for the water fleas fedM.aeruginosa469, andN=17.124/[1+e33.769-0.099t] (R2=0.909), andN=11.202/[1+e20.988-0.145t] (R2=0.953),for the water fleas fedA.cylindrica170.The findings indicate thatC.vulgarismay promote population growth, and thatM.aeruginosa905 andA.cylindrica170 inhibit the growth and reproduction in the water fleas.
2014, Vol. 29 
