| 引用本文: | 汪婵,李猛,夏梦宁,席贻龙,项贤领.转轮虫(Rotaria rotatoria)生活史策略对温度和食物密度变化的响应.湖泊科学,2019,31(5):1437-1446. DOI:10.18307/2019.0502 |
| WANG Chan,LI Meng,XIA Mengning,XI Yilong,XIANG Xianling.Responses of the life history strategies in bdelloid rotifer Rotaria rotatoria to changes in temperature and food density. J. Lake Sci.2019,31(5):1437-1446. DOI:10.18307/2019.0502 |
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| 摘要: |
| 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. |
| 关键词: 蛭态类轮虫 转轮虫 温度 藻密度 生活史策略 |
| DOI：10.18307/2019.0502 |
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| 基金项目:国家自然科学基金项目（31872208）、安徽省自然科学基金项目（1708085MC79）和重要生物资源保护和利用研究安徽省重点实验室专项基金项目联合资助. |
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| Responses of the life history strategies in bdelloid rotifer Rotaria rotatoria to changes in temperature and food density |
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WANG Chan1, LI Meng1, XIA Mengning1, XI Yilong1,2, XIANG Xianling1,2
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1.College of Life Sciences, Anhui Normal University, Wuhu 241000, P. R. China;2.Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province, Wuhu 241000, P. R. China
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| Abstract: |
| Temperature and food density have always been important factors in the growth and reproduction of zooplankton, however few studies attempted to reveal the effects of the two factors on the life history strategies in bdelloid rotifers. In this study, the effects of temperature (24, 28 and 32℃) and food density (0.5×106, 1.0×106, 2.0×106 and 4.0×106 cells/ml) on the growth, survival and reproduction of the bdelloid rotifer Rotaria rotatoria were explored based on the life table. The results showed that temperature had a significant effect on all life history parameters of the rotifer, and the food density as well as interaction of food density and temperature significantly affected the duration of major developmental stages and life expectancy. Regardless of what level the food density was, with the rise of temperature, the development of rotifers was accelerated, accompanied by the shortened reproduction period, reduced life span, and the time when the age-specific survivorship begins to decline gradually moved forward, and the decreasing speed was accelerated, but the intrinsic rate of population growth was increased, which is supposedly attributed to the energy trade-off in the life history strategy of the rotifers under adverse conditions. At lower temperatures (24 and 28℃), the duration of major developmental stages of the rotifers decreased with increasing food density, but high food density was beneficial to rotifers at high temperatures (32℃), and increasing of algae density prolonged the reproduction period and life span in rotifers. Accordingly, it could be concluded that at the suitable culture temperature, the lower algae concentration is conducive to the growth and reproduction of the rotifer, while high food density is necessary to ensure sufficient nutrition and energy for rotifers at higher temperature. At lower food densities, the effects of temperature on the life history parameters of the rotifers were more pronounced, indicating that food density is an important limiting factor, and the limitation or deficiency in food quantity will increase the cost of physiological regulation in basal metabolism of rotifers, thus weaken its tolerance to other factors. |
| Key words: Bdelloid rotifer Rotaria rotatoria temperature algae density life history strategy |
