三个品系角突臂尾轮虫生长和发育的比较研究

以浓度为2．4×10^6cells.ml^-1的斜生栅藻为食物，在25℃下，对采自青岛、广州与芜湖等品系的角突臂尾轮虫的胚胎发育、生殖前期和最小世代时间等个体发育阶段历时以及幼体和成体的个体大小、卵体积和相对卵体积进行了研究．结果表明，轮虫的胚胎发育时间、生殖前期历时和最小世代时间等在品系间均存在显著差异．芜湖品系具有最长的胚胎发育时间，其次为广州品系和青岛品系；青岛品系的生殖前期最长，广州品系最短；而最小世代时间以广州品系最小，青岛品系和芜湖品系次之，后两者之间无显著差异．各品系轮虫胚胎发育时间具有随其相对卵体积的增大而缩短的趋势．同一年龄段各品系间的轮虫幼体体积均有显著差异，且均以芜湖品系为最大．三品系轮虫个体幼体体积与其年龄间均呈曲线相关；刚孵化出的幼体体积与其成体间差异在芜湖品系达244．24％，青岛和广州品系分别为182．89％和156．28％．轮虫成体的个体大小、卵大小和相对卵大小在品系间也存在显著差异．

Comparative studies on individual growth and development of three Brachionus angularis strains

The embryonic developmental period (De), pre-reproductive period (Dp), the least generation time (Tg), body size of juveniles and adults, egg volume and relative egg volume of three strain Brachionus angularis from Qingdao, Guangzhou and Wuhu were studied with Scenedesmus obliquus at 2.4 x 10(6) cells.ml-1 as the rotifers' food at 25 degrees C. We found that there were significantly different in De, Dp and Tg of three strains. De of WH strain was the top, and subsequently was GZ strain and QD strain. QD strain had the longest Dp, but GZ strain had the shortest. Tg in GZ strain was the shortest, and QD strain, and WH strain were longer, respectively, but no significantly difference existed in the later two. De tended to decrease as the relative egg volume increased in the three strains. Body size at the same stage in pre-reproductive period of three strains was significantly different. WH strain had the largest body size during all of the stages. The relationships between body size and the age of the juvenile of QD, GZ and WH strain were all curvilinear. The variance of the neonates and the adults was 244.24% in WH strain, and 182.89%, 156.28% in QD and GZ strain, respectively. The adults' body size, egg size, and relative egg size was significantly different in three strains.