| 无鱼和贫营养条件下水盔形溞对浮游动物群落结构的影响 |
| Daphnia galeata Population Dynamics and Its Effects on Zooplankton Community in Oligotrophic Water without Fish Species |
| 投稿时间：2011-12-22 修订日期：2012-02-10 |
| DOI： |
| 中文关键词:盔形溞 浮游动物群落 围隔 贫营养 |
| 英文关键词:Daphnia galeata zooplankton community enclosure oligotrophy |
| 基金项目:国家自然科学基金项目(No.30970467)资助 |
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| 中文摘要: |
| 为了解无鱼条件下贫营养水体中大型枝角类盔形溞(Daphnia galeata)的种群动态及其对浮游动物群落结构的影响,于2010年3月5日至4月18日在流溪河水库进行围隔试验,设置1个对照组和3个处理组,每个处理有3个重复。对照组(C)为用孔径约2 mm的网过滤后的水库水抽入围隔,试验组抽入过滤后的水库水后添加高、中、低密度(H,M,L)的盔形溞,对照组和试验组添加的盔形溞密度梯度分别为0、0.3、0.6、1.0个/L。无鱼条件下盔形溞种群快速形成高峰,但随后由于食物限制又快速下降。盔形溞高密度种群的建立对轮虫种群产生了显著影响,试验开始后轮虫受到盔形溞抑制而密度下降。在试验后期,食物数量下降,盔形溞密度下降并维持在较低的密度,而大型桡足类中的舌状叶镖水蚤(Pyllodiaptomus tunguidus)密度增加,显示了竞争优势。由于大型围隔试验对浮游动物操作的可重复性较差,个别围隔中出现了透明薄皮溞(Leptodora kindti),也对盔形溞种群及浮游动物群落结构产生了影响。 |
| 英文摘要: |
| In order to understand population dynamics of Daphnia galeata and its effects on zooplankton community in oligotrophic water, an enclosure experiment was carried out in the enclosures without fish species in Liuxihe Reservoir from March 5，2010 to April 18，2010. There were four treatments，including one control(C).In the enclosures，the reservoir water was pumped into the enclosures after filtering with net of 2 mm mesh size. Except the control group，D. galeata was added to have low，middle and high densities in the three treatments(L-low，M-middle，H-high ).The density of adding D. galeata was 0 ind/L in C，0. 3 ind/L in L, 0. 6 ind/L in M，and1 .0 ind/L in H. Each treatment has three replicates. The results showed that in no-fish condition，D. galeata populations increased rapidly and got a density peak via parthenogenesis. However，food shortage in oligotrophic water limited the population density and it declined rapidly. Increase in D. galeata density suppressed largely the rotifer community .In the beginning of the experiment，rotifers were strongly competed out by D. galeata. In the late period of the experiment, the density of D. galeata decreased and replaced by Phyllodiaptomus tunguidus population .It needs be noted that the random imports of Leptodora kindti with pumping water into several enclosures might influence D. galeata and even the zooplankton community. This randomness indicates the low repeatability in large enclosure manipulation for zooplankton.
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| 程丹,李慧明,陈晓玲,韩博平.2012.无鱼和贫营养条件下水盔形溞对浮游动物群落结构的影响[J].水生态学杂志,33(2):76-84. |
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