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Chinese Journal of Applied Ecology ›› 2004, Vol. ›› Issue (7): 1253-1256.

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Interspecific interaction between Moina mongolica and Brachionus plicatilis

CHEN Taoying, WANG Yan, HUANG Changzhi, HU Shiheng, ZHANG Jun   

  1. Laboratory of Aquatic Ecology and Fish Nutrition, Shanghai Fisheries University, Shanghai 200090, China
  • Received:2003-04-28 Revised:2003-07-16 Online:2004-07-15

Abstract: In a laboratory experiment,Moina mongolica and Brachionus plicatilis were polycultured at four relatively inoculating densities,i.e.,0.06/0.30,0.10/0.30,0.30/0.30 and 0.60/0.30 (ind穖l-1/ind穖l-1),while M.mongolica monocultured at 0.06,0.10,0.30 and 0.60 ind穖l-1 and B.plicatilis at 0.30 ind穖l-1 were used as the control.Interspecific interference did exist between M.mongolica and B.plicatilis when these two species coexisted in a microcosm.In the polycultured microcosms,depressed population density of M.mongolica resulted from the coexistence of B.plicatilis,and M.mongolica maintained at extremely low density.In opposite,M.mongolica had negligibly negative influence on the population of B.plicatilis.Further experiment showed that the mortality of M.mongolica deprived of food for 120 h was 100%,while 90% of B.plicatilis survived after 144 h of food deprivation.The relatively strong capacity of B.plicatilis in tolerating starvation may be one of the important reasons for it wins the competition against M.mongolica.

Key words: Moina mongolica, Brachionus plicatilis, Interspecific interaction

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