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作 者 ：席贻龙,张雷,董丽丽

期 刊 ：生态学报 2007年 27卷 8期 页码：3334~3340

关键词：镜湖；轮虫休眠卵；季节；原位萌发；

Keywords:Lake Jinghu, rotifer resting egg, season, hatching in situ,

摘 要 ：将2004年春季采于芜湖市镜湖的沉积物样品在不同季节进行原位萌发发现，除冬季未见有轮虫孵出外，其余3个季节共孵出轮虫39种，隶属于7科19属；大湖区每200 ml沉积物中休眠卵萌发出的轮虫数量平均为212.2个±48.9个，显著高于小湖区的39.1个±10.3个。大湖区沉积物在夏季萌发出的小巨头轮虫（Cephalodella exigua）、大肚须足轮虫（Euchlanis dilatata）和壶状臂尾轮虫（Brachionus urceolaris）、秋季萌发出的裂足臂尾轮虫（B. diversicornis）和角突臂尾轮虫（B. angularis）以及春季萌发出的暗小异尾轮虫（Trichocerca pusilla）和等刺异尾轮虫（T. similis）分别占各季节总萌发数的51.1%、19.7%、15.7%、14.7%、11.1%、38.4%和23.7%，小湖区沉积物在夏季萌发出的多须伪前翼轮虫（Proalides tentaculates）和暗小异尾轮虫、秋季萌发出的裂痕龟纹轮虫（Anuraeopsis fissa）、尖趾单趾轮虫（Monostyla closterocerca）和大肚须足轮虫以及春季萌发出的尖趾单趾轮虫、盘状鞍甲轮虫（Lepadella patella）和暗小异尾轮虫分别占各季节总萌发数的53.9%、31.6%、18%、17%、13%、31%、24.1%和17.2%。各季节萌发出的轮虫与同季节水体中存在的轮虫种类及数量间存在的较大差异表明，那些常年存在于水体中的轮虫所产的休眠卵的萌发对其种群增长的直接贡献可能不大；而那些每年都要从水体中消失一段时间的轮虫所产的休眠卵的萌发在其种群重建中的作用可能因种类的不同而异。

Abstract:Rotifer resting eggs in sediments collected from the two basins of Lake Jinghu were incubated in situ, and a total of 39 rotifer species belonging to 19 genera and 7 families were recorded. The mean number of hatched rotifers from per 200 milliliters sediments of the big basin was (212.2±48.9) individuals, that of the small basin was (39.1±10.3) individuals. In the big basin, Cephalodella exigua, Euchlanis dilatata and Brachionus urceolaris hatched in Summer, B. diversicornis and B. angularis hatched in Autumn, and Trichocerca pusilla and T. similes hatched in Spring accounted for 51.1%, 19.7%, 157%, 14.7%, 11.1%, 38.4% and 23.7% of the total rotifers hatched in the same season, respectively. In the small basin, however, Proalides tentaculates and T. pusilla hatched in Summer, Anuraeopsis fissa, Monostyla closterocerca and E. dilatata hatched in Autumn, and M. closterocerca, Lepadella patella and T. pusilla hatched in Spring accounted for 53.9%, 31.6%, 18%, 17%, 13%, 31%, 24.1% and 17.2% of the total number of the rotifers hatched in the same season, respectively. The obvious discrepancy of species composition and density between the rotifers hatched from the sediments and those existing in the contemporary water indicated that the hatching of rotifer resting eggs in the sediments might not contribute immediately much to the population growth of rotifers which survive throughout the year, but play different roles in reconstructing populations of rotifers which disappeared from the water for portions of the year, depending on the rotifer species.

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