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22. Ecological benefits of consistent expression of posterolateral spines in Brachionus calyciflorus.

Author

Ge, Ya-Li, Liu, Lu, Cao, Man-Man, Ge, Cui-Cui, Xi, Yi-Long, and Zhang, Gen

Subjects
BRACHIONUS, SPINE, DENDRITIC spines, POPULATION density, ROTIFERA
Abstract

Plasticity of spine morphology is a universal phenomenon in rotifers. Some Brachionus calyciflorus clones consistently develop two posterolateral spines (PS) with similar length (Type A), but others (Type B) not. The underlying mechanisms remain unknown. In the present study, the resting eggs were collected from the same B. calyciflorus strain, their hatchlings (stem rotifers) were categorized into types A and B, and then, clonally cultured for eight generations at different algal densities or temperatures. The results showed that the PS varied in length among different temperatures and food levels, but inherent differences between types A and B were always observed, indicating that differentiation between types A and B might not associate with temperature or food availability. Next, we compared the population growth and PS length between types A and B at the general condition (control), in responses to Asplanchna kairomone, Keratella tropica and Moina macrocopa. The results showed that type B had higher population growth rate than type A, suggesting the higher adaptability of type B in the general condition. In response to Asplanchna kairomone, the PS length of both types A and B was significantly induced, and their PS length was similar, but type B showed higher population growth rate than type A. Coculture with M. macrocopa significantly lengthened the PS of type B but not type A, and types A and B showed similar population growth curves. Coculture with K. tropica did not affect significantly the PS length of types A and B. However, type A showed significantly and greatly higher population density and population growth rate than type B, indicating a much stronger competition ability of type A than type B against K. tropica. Overall, these results indicated that consistent development of PS might facilitate B. calyciflorus to defend against small competitors. [ABSTRACT FROM AUTHOR]

Published
2022
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26. Responses of the life history strategies in bdelloid rotifer Rotaria rotatoria to changes in temperature and food density

Author

Li Meng, Xia Mengning, Wang Chan, Xiang Xianling, and XI Yi-long

Subjects
Earth and Planetary Sciences (miscellaneous), Aquatic Science, Pollution, Water Science and Technology
Abstract

温度和食物密度一直是浮游动物生长和繁殖过程中的重要影响因子，而有关两者对蛭态类轮虫生活史策略的影响研究鲜有报道.本研究基于生命表，探究了温度（24、28和32℃）和食物密度（0.5×106、1.0×106、2.0×106和4.0×106 cells/ml）对蛭态类转轮虫（Rotaria rotatoria）生长、存活和繁殖的影响.结果表明，温度对转轮虫的所有生活史参数均具有极显著影响，食物密度以及温度和食物密度的交互作用显著地影响轮虫的主要发育阶段历时和生命期望.无论食物密度如何，随着温度的升高，轮虫的发育速度加快，繁殖期缩短，寿命减小，特定年龄存活率开始下降的时间逐渐前移，下降的速度也逐渐加快，但内禀增长率增加，这是转轮虫在不利条件下的生活史策略——能量分配权衡.在较低温度下（24和28℃），转轮虫的各主要发育阶段历时随着食物密度的增加而减小，但在高温下（32℃）高食物密度却对轮虫有利，轮虫的繁殖期和寿命随食物密度的增加而增加；可见，在适宜培养温度下，较低的藻浓度有利于轮虫的生长和繁殖，而高温下则需要高食物密度以保证轮虫对物质和能量的需求.在较低食物密度下，温度对转轮虫生活史参数的影响更加显著，这表明食物密度是重要的限制因子，其在量上的限制或不足会增加轮虫对基础代谢生理调节的代价，从而对其他因子的耐受能力可能随之缩小.

Published
2019

35. Combined effects of the microcystin MC-LR and temperature on the morphological features of Brachionus calyciflorus

Author

XI Yi-long, Kang Lin, Xiang Xianling, Wan Fengying, Zhu Lingyun, and Chen Yingying

Subjects
Earth and Planetary Sciences (miscellaneous), Aquatic Science, Pollution, Water Science and Technology
Abstract

近年来，随着全球变暖和水体富营养化程度的日趋严重，淡水湖泊藻类水华现象频发；由此引发的微囊藻毒素对水生生物的生态毒性效应备受关注.本实验探究了4个温度（16、20、24和28℃）和3个微囊藻毒素MC-LR浓度（2.0、4.0和6.0 μg/ml）对4个品系萼花臂尾轮虫（Brachionus calyciflorus）形态特征的影响.通过2种DNA分类方法——自动条形码查询系统和Yule溯祖模型将萼花臂尾轮虫划分为3个进化种；4个品系轮虫的形态学参数总体随温度升高呈减小趋势.在16℃下，轮虫的形态特征在各品系间未见显著差异；20℃下的昆明品系KMC23形态参数最小，而西宁XN2品系最大；在24℃下，西宁XN2品系的形态参数显著增大；兰州LZB1和西宁XN2品系对温度变化的响应特征相似且在28℃下最小，这可能与两者属于同一进化种有关.4个品系轮虫的卵特征参数对温度变化的响应各有不同.可见，品系和隐种的不同是造成4个轮虫克隆形态学参数对温度差异响应的重要内源性因素.各品系轮虫中，兰州LZB1品系受温度、MC-LR及两者交互作用的影响最为显著，形态可塑性最强.在高温胁迫下，兰州LZB1品系的所有形态学参数均显著减小，但MC-LR浓度对该品系轮虫的形态学参数并未产生显著影响；经低温胁迫后，低浓度的MC-LR没有显著改变兰州LZB1品系轮虫的形态学参数，而高浓度的MC-LR显著降低了轮虫的大部分形态学参数.微囊藻毒素对轮虫形态可塑性的影响受到了内源性因素和外源性因素的综合制约.

Published
2018

37. Temporal variations of chlorophyll-a concentration and their relationships with abiotic and biotic factors in two small shallow lakes

Author

Zhang Gen, Wen Xinli, Feng Ruonan, Xue Yinghao, and XI Yi-long

Subjects
0106 biological sciences, Abiotic component, Chlorophyll a, Biotic component, Ecology, 010604 marine biology & hydrobiology, 010501 environmental sciences, Aquatic Science, 01 natural sciences, Pollution, chemistry.chemical_compound, chemistry, Earth and Planetary Sciences (miscellaneous), Environmental science, 0105 earth and related environmental sciences, Water Science and Technology
Published
2017

41. Influence of two Keratella tropica morphs on the population dynamics of the predator Asplanchna brightwelli.

Author

Ge, Ya-Li, Ge, Cui-Cui, Zhan, Rong, Yu, Jin-Hang, Tong-Luo, Xi, Yi-Long, and Zhang, Gen

Subjects
POPULATION dynamics, PARAMETERS (Statistics), PREDATORY animals, PREY availability, SPINE
Abstract

We evaluated the effects of two morphs of the rotifer Keratella tropica (long-posterior spines, LS; short-posterior spines, SS) on life-table parameters and population dynamics of the rotiferan predator Asplanchna brightwelli. At the prey densities of 10 and 30 ind./mL, A. brightwelli showed significantly higher intrinsic rate of population increase, net reproductive rate and population growth rate when fed with SS than when fed with LS. At the prey densities of 10, 20 and 30 ind./mL, A. brightwelli showed higher population growth rate when fed with SS than those fed with LS. Overall, these results indicated that development of long spines could effectively defend against the predation of A. brightwelli on K. tropica. [ABSTRACT FROM AUTHOR]

Published
2020
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49. Cover Image

Author

Pan, Ling, primary, Xi, Yi-Long, additional, Gu, Jing, additional, Jiang, Shan, additional, Zhu, Han, additional, and Zhang, Bing-Xing, additional

Published
2017
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