排序方式： 共有33条查询结果，搜索用时 7 毫秒
31.
裂殖壶菌(Schizochytrium limanium)是一种高DHA含量的海洋真菌,本实验用裂殖壶菌对褶皱臂尾轮虫(Brachionus plicatilis)进行营养强化。结果表明:3个实验组强化后轮虫体内的DHA/FA值和DHA含量均显著提高,DHA/FA值分别为5.98%、10.21%和13.44%,轮虫体内的DHA质量比分别为4.42,7.85,8.14 mg/g,并于12 h后达到最大值,超过12h后轮虫体内的DHA质量比及DHA/FA值开始下降。对照组在实验过程中均未检出DHA。各实验组的其他指标,如轮虫密度也显著高于对照组,并且实验组的怀卵率分别为34.8%、46.5%和53.7%,而对照组仅为20.1%。 相似文献
32.
The effect of temperature on the life history characteristics of amictic females (AF), unfertilized mictic females (UMF) and
fertilized mictic females (FMF) inBrachionus calyciflorus was studied with replicated individual cultures at 20°C, 25°C and 30°C, and with algaeScenedesmus 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°C, were the longest, and the number of eggs produced by an UMF at 30°C 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 female. 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.
Projects supported by NSFC (No. 39870158), Natural Science Foundation of Anhui Province (No. 100330: No. 042416) and the Excellent
Youth Foundation (No. 04043050). 相似文献
33.
北京官厅水库轮虫群落结构与水体富营养化状况 总被引：9，自引：4，他引：5
于2007年1-12月对官厅水库上游(北京段)进行调查,利用非生物环境因子对水体的营养状况进行了评价,并通过种类组成、优势种、生物量及多样性指数等指标探讨了轮虫群落结构与水体富营养化的关系.结果表明,官厅水库(北京段)已达到了富营养的水平,在轮虫的种类组成中,10个富营养化的指示种类大部分都有出现,其中螺形龟甲轮虫(Keratella cochlearis)和针簇多肢轮虫(Polyarthra trigla)为优势种;轮虫密度均在1000ind./L以上,生物量在1mg/L以上,轮虫的密度、生物量的季节分布与水温显著正相关(P0.05),水平分布与水体的营养状况显著正相关(P0.05),垂直分布没有明显的规律性;轮虫多样性指数较低,但与水体营养水平显著相关(P0.05).证明轮虫群落结构与水体富营养化之间存在着密切的关系,富营养化是导致轮虫群落结构变化的主要动因. 相似文献