[Sexual reproduction of Filinia longiseta in Jinghu Lake of Wuhu City].
From May to November 2004, the sexual reproduction of Filinia longiseta in two areas of Jinghu Lake was studied, with its relations to the population density of F. longiseta and to the water temperature, Chl-a concentration, Secchi's disc reading, and total density of rotifers examined. The results showed that no mictic F. longiseta females were detected till the water temperature was up to 22 degrees C or the Secchi's disc reading was <95 cm in small area and <100 cm in large area. The sexual reproduction of F. longiseta occurred when its population density was > 122 ind . L(-1) and >113 ind . L(-1) in small and large areas, respectively. The density of mictic F. longiseta females was positively correlated to the population density of F. longiseta and the total density of rotifers (P <0. 01), but no significant relationships were observed between the mictic F. longiseta females density and the water temperature, Chl-a concentration and Secchi's disc reading. All the test affecting, factors had no significant effects on F. longiseta mictic and fertilization rates. The sexual reproduction of F. longiseta occurred in the early phase of population growth cycle, and the mictic F. longiseta females were produced in the patterns of punctuation and multi cycles. The maximal mictic rate occurred with the occurrence of maximal population density, while the maximal fertilization rate occurred by the end of population growth cycle.
Qian
Fang-ping
FP
Provincial Key Laboratory of Conservation and Utilization for Important Biological Resource, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, China. qianfangping2003@yahoo.com.cn
Xi
Yi-long
YL
Zhang
Lei
L
Wen
Xin-li
XL
D000818:Animals; D002681:China; D005260:Female; D005618:Fresh Water / Q000469:parasitology*; D005843:Geography; D008297:Male; D011158:Population Growth; D012098:Reproduction; D012403:Rotifera / Q000502:physiology*; D012621:Seasons; D013696:Temperature