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pH值对萼花臂尾轮虫种群增长及繁殖的影响
引用本文:王金秋,李德尚.pH值对萼花臂尾轮虫种群增长及繁殖的影响[J].应用生态学报,1997,8(4):435-438.
作者姓名:王金秋  李德尚
作者单位:华东师范大学生物系!上海200062(王金秋),青岛海洋大学水产学院!青岛266003(李德尚,罗一兵,王芳)
基金项目:山东省自然科学基金!(941406)
摘    要:采用种群积累培养法,实验观察了 pH在3.5~11.5之间(间隔 1)萼花臂尾轮虫 (Brachionus calyciflorus)种群的增长及繁殖.结果表明,该轮虫种群在PH6.5~8.5之间增 长较快, 8. 5时增长最快,即瞬时增长率 r和种群密度较大和最大; pH在 3. 5~4. 5和 9. 5 ~10. 5之间,种群为负增长,即 r为负值; pH在 5. 5~9. 5之间种群为正增长,即正为正 值.该轮虫存活的pH上限为11.5,下限为3.5.在种群增长最适pH(8.5)条件下,该轮虫 的繁殖最快,即绝对带卵量最高(132个·ml-1);pH在9.5时,其相对带卵量最高.为其它 pH值条件下的2~4倍.本研究结果可为淡水轮虫的大批量培养提供可靠的pH值技术指 标.

关 键 词:萼花臂  尾轮虫  种群增长  瞬时增长率  繁殖  带卵量

Influence of medium pH on population growth and reproduction of Brachionus calyciflorus.
Wang Jinqiu, Li Deshang, Luo Yibing and Wang Fang.Influence of medium pH on population growth and reproduction of Brachionus calyciflorus.[J].Chinese Journal of Applied Ecology,1997,8(4):435-438.
Authors:Wang Jinqiu  Li Deshang  Luo Yibing and Wang Fang
Institution:Ocean University of Qingdao Qing- dao 266003
Abstract:With the method of population accumulation culture, the population growth and reproduction of rotifer(Brachionus calyciflorus ) were observed in pH 3. 5 ~ 11. 5 media with an increment of 1 pH unit. The results show that rotifer population grows faster at pH 6. 5 ~ 8. 5 and fastest at pH 8.5, indicating that in this pH range, the instantaneous rate(r) is fast and the density is the maximum. At pH 5. 5~9. 5. the r value is positive. but at pH 3. 5~4. 5 and 9. 5~ 10. 5, it is negative, i. e.. the population shows a negative growth. Rotifer can survive at pH 3. 5 ~ 11. 5, but the optimum pH for population growth is 8. 5. where the rotifer shows a maximum reproductive sped. and the absolute egg density is the highest (132 cells' ml-1 ). The relative egg density is the highest at pH 9. 5, 2~4 times larger than that al other pH values.
Keywords:Brachionus calyciflorus  Population growth  Instantaneous growth rate  Reproduction  Egg density  
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