镜湖不同湖区沉积物中轮虫休眠卵萌发的比较研究
COMPARATIVE STUDIES ON HATCHING OF ROTIFER RESTING EGGS IN THE SEDIMENTS OF DIFFERENT BASINS IN LAKE JINGHU
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摘要: 实验室内对镜湖沉积物中的轮虫休眠卵进行了萌发,共孵出轮虫47种,隶属于10科19属;其中大湖区沉积物中萌发出的轮虫40种,小湖区41种,两湖区共同种类34种。每毫升大湖区沉积物中休眠卵萌发出的轮虫平均数量为(1.1±0.1)个,显著高于小湖区的(0.4±0.0)个。在两湖区沉积物中,以3种孵化方式所萌发出的平均密度超过4.0ind./200mL的轮虫种类总计有6种,它们是多须伪前翼轮虫(Proalides tentaculates)、裂痕龟纹轮虫(Anuraeop-sis fissa)、螺形龟甲轮虫(Keratella cochlearis)、裂足臂尾轮虫(Brachionus diversicornis)、臂三肢轮虫(Filinia brachiata)和萼花臂尾轮虫(Brachionus calyciflorus);其中前三种轮虫为两湖区所共有。共有的3种轮虫的孵出情况在两湖区沉积物间也存在着差异。在小湖区沉积物中,3种孵化方式下孵出的平均密度大于0.05ind./200mL的轮虫属是臂尾轮属、伪前翼轮属、龟甲轮属和龟纹轮属,而大湖区沉积物中孵出的平均密度较高的轮虫属还包括三肢轮属、巨头轮属(Cephalodella)和异尾轮属(Trichocerca);水体营养程度较高的大湖区沉积物中孵出的臂尾轮属、伪前翼轮属和龟甲轮属轮虫的密度均高于营养程度较低的小湖区。Abstract: Sediment samples from the two basins of Lake Jinghu were incubated at 10 ℃, 20 ℃and 30 ℃to induce hatching of rotiferresting eggs.The emergent rotifers were identified and counted.47 rotifer species were identified,which belongs to 19 genera,10 families.40 species of rotifers were hatched from the sediments of big basin, and 41 species from the small basin of the lake.34 species of rotifers came from those of the two basins.On an average,1.1±0.1 and 0.4 ±0.0 rotifers were hatched from permilliliter sediments of the big and the small basins, respectively.The rotifer species, which was hatched at one incubation patternfrom the resting eggs in sediments of both the two basins of the lake and whose density was higher than 20ind./ 200mL, includedProalides tentaculates, Anuraeopsis fissa,Keratella cochlearis, Brachionusdiversicornis, Filinia brachiata and B.calyciflorus.Withthe three former species belonging to both the two basins of the lake, their emergence was different.The rotifer genera with higherdensities (>0.05ind./ 200mL)including Brachionus, Proalides,Keratella and Anuraeopsis were hatched from sediments of thesamll basins.Beside of those genera, Filinia, Cephalodella and Trichocerca were also hatched from those of the big basin.Thedensities of Brachionus, Proalides and Keratella hatched from sediments of the big basin with more trophic were higher than thoseof the small basin with less trophic.
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Keywords:
- Lake Jinghu /
- Rotifer resting egg /
- Hatching /
- Temperature
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