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题名: 鲢鳙对浮游动物群落结构的影响
作者: 杨宇峰
答辩日期: 1991
导师: 黄祥飞
专业: 水生生物学
授予单位: 中国科学院水生生物研究所
授予地点: 中国科学院水生生物研究所
学位: 硕士
关键词: 围圈 ; 浮游动物 ; 群落结构 ; 体长频度分布
摘要: 1989年5-10月和1990年4-9月,武汉东湖,运用围圈的方法研究了鲢鳙对浮游动物群落结构的影响,初步观察表明:在有鱼和无鱼的围圈中,浮游动物的种类组成、现存量和个体大小均有明显不同。在鲢鳙混养的围圈中,原生动物和小型轮虫较多,而大型的浮游动物较少。甲壳动物的数量占整个浮游动物总数的比例不足2%。没有出现蓝藻“水华”。在无鱼的围圈中,原生动物和小型轮虫的平均密度较低,而大型的浮游动物较高。特别是大型的(左三点水右蚤)类在1990年4-6月占据优势。1990年,甲壳动物的数量占浮游动物总数的8%以上。在6-9月,且有大量的蓝藻“水华”出现。就浮游动物平均生物量而论,无鱼的围圈比有鱼的围圈高得多。如1990年4-7月,无鱼的两个围圈分别为55.035和38.374mg/l,而鲢鳙混养的两个围圈仅为3.028和3.490mg/l。甲壳动物(无节幼体除外)的体长频度分布表明:在无鱼围圈中,大型甲壳动物的频度比鲢鳙的围圈要高。如在1990年5月7日,在元鱼的围圈中,1.5mm以上甲壳动物的频度约是鲢鳙混养围圈的13倍。鲢和鳙对浮游动物的影响是不同的。在放鲢鱼的围圈中,原生动物和轮虫的现存量比放鳙鱼的围圈要低,而甲壳动物的现存量正好相反。围圈实验表明:鲢鳙的摄食促进了浮游动物向小型化方向发展。
英文摘要: The influence of silver carp (Hypophthalmichthys molitrix) and bighead (Aristichthys nobilis) on the zooplankton community structure in Lake Donghu, Wuhan was studied using enclosure method during May-October 1989 and April-September 1990. Species composition, standing crop and body size of zooplankton showed remarkable differences between enclosures with and without fish. In the enclosures in which silver carp and bighead were stocked, the average densities of the Protozoa and some small-sized rotifers were high, while those of the large-sized zooplankton were low. The crustacean percentage was on average less than 2% of the total number. The blue-green algal "water bloom" did not appear in 1989-1990. In the enclosures without fish, the average densities of the Protozoa and some small-sized rotifers were low, while those of the large-sized some small-sized rotifers were low, while those of the large-sized zooplankton were high. Especially, the large-sized Daphnia was dominant during April-June 1990. The crustancean percentage was on average more than 8% of the total number (1990). A heavy "water bloom" of the blue-green algae appeared during June-September in 1989-1990. The average biomass of zooplankton was much higher in the two enclosures without fish (55.035 mg/l 38.374 mg/l) than in the two enclosures with fish (3.028 mg/l and 3.490 mg/l) during April-July 1990. The examination of the size-frequency distributions of the crustancean (copepod nauplius excluded) showed that the frequency of the large sized crustacean was higher in the enclosures without fish that in the enclosures with fish. For example, on May 7, 1990, the frequency of crustacean (>1.5mm) in the enclosures without fish was about 13 times as high as in the enclosures with fish. The influences of silver carp and bighead on the zooplankton were different. The standing crop of Protozoa and Rotifer was lower in the enclosure with silver carp than in the enclosure with bighead, while the standing crop of the crustacean showed a reverse result. The enclosure experimental results showed that the feeding of silver carp and bighead had resulted in the dominance of small-sized zooplankton instead of large sized ones.
语种: 中文
内容类型: 学位论文
URI标识: http://ir.ihb.ac.cn/handle/342005/12836
Appears in Collections:中科院水生所知识产出(2009年前)_学位论文

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Recommended Citation:
鲢鳙对浮游动物群落结构的影响.杨宇峰[d].中国科学院水生生物研究所,1991.20-25
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