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Sexual reproduction and short-term fitness advantage in the rotifer brachionus calyciflorus:implications for the coexistence of sympatric clones

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Chinese Journal of Oceanology and Limnology 2013年第5期31卷 987-993页

作者：孙栋马蕊刘玮牛翠娟 Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering College of Life Sciences Beijing Normal University Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of Oceanography SOA Beijing No. 5 High School Research Center for Marine Ecology First Institute of Oceanography SOA

Large numbers of rotifer eggs from sediment resting egg banks may hatch simultaneously under appropriate conditions; therefore, natural populations are likely to be multiclonal in a growing season. A recent field investigation showed that subordinate and ephemeral clones were able to establish populations in an environment with several strongly dominant clone populations. However, it was not clear how the subordinate populations maintained their growth under these conditions where the crowding signal would induce high levels of sexual reproduction in the dominant clone populations. In the present study, we conducted a continuous passage to 60 generations for new populations at three different temperatures （15~C, 25~C, and 35~C）. These populations emerged from resting eggs produced by a clone population. At the first, 30th, and 60th generations, the populations were sampled and fitness was assayed using the life-table method. We found a significant short-term fitness advantage for populations newly emerged from resting eggs produced by a clone population of the rotifer brachionus calycifiorus, followed by a significant decrease in relative fitness with long-term continuous passage. Our results suggested that the early short- term fitness advantage was important for later-hatched and subordinate clone populations in an environment with multiple sympatric clones. The early short-term fitness might also promote the coexistence of sympatric clones because it could help to offset the cost of early sexual reproduction.

关键词： sexual reproduction cyclical parthenogenesis brachionus calyciflorus coexistence fitness advantage

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Temperature Effect on the Life History of Three Types of brachionus calyciflorus Females

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Chinese Journal of Oceanology and Limnology 2004年第2期22卷 192-197页

作者：席贻龙黄祥飞 College of Life Sciences Anhui Normal University Wuhu 241000 China Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China

The effect of temperature on the life history characteristics of amictic females (AF), unfertilized mictic females (UMF) and fertilized mictic females (FMF) in brachionus calyciflorus was studied with replicated individual cultures at 20℃,25℃ and 30℃, and with algae Scenedesmus obliquus for their food. There were highly significant effects of both temperature and female type, independently and interactively, on the duration of juvenile and post-reproduction periods, and the number of eggs produced by the rotifer per life cycle. Among all the temperature-female type combinations, all the juvenile periods of FMF, and the post-reproduction periods of UMF and FMF at 20℃, were the longest, and the number of eggs produced by an UMF at 30℃ was the highest. There were highly significant effects of both temperature and female type on the duration of the reproduction period, but no clear correlation was observed between temperature and female type. The reproduction period of AF was longer than that of UMF and FMF. Only temperature influenced significantly the mean life-span of the three types of females. The duration of juvenile, reproduction and post-reproduction periods as well as the life-span of the three types of females were all reduced very significantly with rise of temperature, but the rates of reduction varied with female type. Among the three types of females, the number of eggs produced per life cycle by an UMF was the highest, and that of a FMF was the lowest. A significant relationship between the number of eggs produced per life cycle and temperature was observed only in the UMF.

关键词： brachionus calyciflorus rotifer life history temperature female type

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Acute Toxicity of Two Pyrethroids Insecticides on brachionus calyciflorus

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Plant Diseases and Pests 2011年第3期2卷 62-64,68页

作者：黄林刘昌利韦传宝李军军皖西学院生物与制药工程学院安徽六安237012

[ Objective] The paper was to study the 24 and 48 h acute toxicity of common pyrethroid insecticides of eypermethrin and deltamethrin on brachionus calyciflorus. [ Method ] With Guangzhou strain of B. colyciflorus as test animal, the standard toxicity test method was used to carry out acute toxicity test, and LC50 of cypermethrin and deltamethrin on rotifer was determined using probit method. [ Result ] LC50 of cypermethrin on rotifer was 3 376.87 and 5.87 μg/L at 24 and 48 h, respectively, and those of deltamethrin on rotifer was 594.56 and 74.17 μg/L, respectively. [Condusion] Acute toxicity of cypermethrin and dehamethrin on rotifer at 24 and 48 h was different, LC50 of cypermethrin and deltamethrin on rotifer at 48 h was more sensitive to monitor the chemical pollutants in water body than LC50 at 24 h.

关键词： brachionus calyciflorus Strain Acute toxicity Pyrethroids Cypermethrin Deltamethrin Chfina

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Polymorphism and Morphotype Transformations in the Rotifer(brachionus calyciflorus)

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Zoological Research 2007年第1期28卷 68-72页

作者：殷旭旺牛翠娟北京师范大学生命科学学院教育部生物多样性与生态工程重点实验室北京100875

The relationship of three brachionus calyciflorus morphotypes （two short-spined, single-spined and spineless ones） was studied in the laboratory. Newly hatched females of each morphotype were cultured individually in an inorganic or Asplanchna-conditioned mediums, and the morphotype of their offspring were checked at 200 x magnification. Females of each morphotype, cultured in the inorganic medium, could produce offspring of these three morphotypes in a single generation. Females of all three morphotyes could respond to specific Asplanchna-substances when they were cultured in Asplanchna-conditioned medium. Moreover, we observed that these three morphotype females could coexist in the medium and had three types of egg-bearing females. Based on the above observations we suggest that B. calyciflorus was a morphotype complex and has three basic morphotypes.

关键词： brachionus calyciflorus Morphotype Polymorphism Posterolateral spine

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比较不同pH值对萼花臂尾轮虫(brachionus calyciflorus)繁殖的影响

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南京师大学报(自然科学版) 1986年第4期 98-101页

作者：徐家铸袁瑞忠南京师大生物系

萼花臂尾轮虫的生活史有三种独立的个体——非混交雌体、混交雌体和雄体。非混交雌体繁殖的唯一方法是孤雌生殖,它们的卵带有双倍数目的染色体,在不良的环境条件下,非混交雌体产的卵,会发育为混交雌体。本文仅以非混交雌体为材料,了解不... 详细信息

萼花臂尾轮虫的生活史有三种独立的个体——非混交雌体、混交雌体和雄体。非混交雌体繁殖的唯一方法是孤雌生殖,它们的卵带有双倍数目的染色体,在不良的环境条件下,非混交雌体产的卵,会发育为混交雌体。本文仅以非混交雌体为材料,了解不同PH值对它们的繁殖影响及该种轮虫产生混交雌体的条件。萼花臂尾轮虫分布广、且个体出现的数量很多,个体全长300—350μm,宽180—190μm[1],个体平均生物量为2.5μg[4],轮虫是主要经济鱼类在鱼苗阶段的主要饵料,在水产养殖上具有重要的经济价值[2]。

关键词：混交雌体生活史轮虫 brachionus calyciflorus pH

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