| 摘要: |
| 采用实验生态学方法,就不同初始种群密度及食物密度等因素对海洋纤毛虫巨大拟阿脑虫(隶属纤毛门,盾纤目)的种群自然增长率(r)及世代时间(G)的影响进行了探讨。结果表明,初始种群密度与r值呈负相关,与G则呈正相关,初始密度为1ind/ml时, r值达最大值2.61/d, G值则为最小值为0.29d; r值随食物密度的增大而增大,当食物密度为2.8E+0.8ind/ml时, r值达最大值为2.07d。同时讨论了种群自然增长率和世代时间之计算方法在实验中的应用。 |
| 关键词: 巨大拟阿脑虫 种群自然增长率 世代时间 实验生态学 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(39970098号);高等学校骨干教师资助计划联合资助 |
|
| EXPERIMENTAL ECOLOGY STUDIES ON THE MARINE CILIATE PARANOPHRYS MAGNA: EFFECTS OF DIFFERENT INITIAL POPULATION DENSITIES AND FOOD CONDITIONS ON THE POPULATION GROWTH |
|
ZHANG Shao-Li, MA Hong-Gang, SONG Wei-Bo
|
|
The Key Laboratory of Mariculture, Ministry of Education, Ocean University of Qingdao, Qingdao, 266003
|
| Abstract: |
| The effects of different initial population densities and food conditions on the natural rate of increase in the population (r) and generation time (G) of the marine ciliate Paranophrys magna (Ciliophora, Scuticociliatida) were studied using experimental ecological methods. The results revealed that (1) the relationship between the initial population density and r is negatively correlated while the G is positive (at the water temperature 22°C the values of r varied between 1.19/d and 2.38/d corresponding to G: 0.29–0.58d in pure cultures with the initial population densities being 1, 10, 50 and 100 ind/ml, respectively); and (2) the values ofr increased with an increase in food density until it reached the maximum value (r=2.07/d) when the food density was 2. 8E+0.8 ind/ml. Based on the results obtained from our present investigations, two different measuring methods for r were discussed; a simplified method is shown to be reliable when the initial conditions are fixed in the monofactorial experiment. |
| Key words: Paranophrys magna, Natural rate of increase, Generation time, Experimental ecology |
