| 1. | The next best way to quantify the amount of protoplasm in each trophic level is to weigh it .
确定每一个营养阶层原生质总量的第二个好办法是称重。 |
| 2. | Producer the first trophic level , in a food chain
生产者：食物链中第一个营养级。 |
| 3. | These microscopic organisms are assigned a trophic level ( tl ) of 1
这些微生物的营养级为1 。 |
| 4. | Protozoan community character in relation to trophic level in the beijing section of the juma river
拒马河北京段原生动物群落特征及其对河流营养状况的指示 |
| 5. | Birds are positioned at high trophic level within the food web in the ecosystem , and thus any changes within the system can affect the birds in one way or another
鸟类在生态系统中处于较高的营养级，生态系统中住何一个环节的变化都可能对鸟类造成一定的影响。 |
| 6. | Abstract based on nine - time investigation of current eutrophication status of lake taihu during 1994 - 1995 , this paper evaluated the trophic levels in the different periods and analyzed the development of the main nurtient content in the nearest 35 years
摘要在1994 - 1995年太湖9次富营养化现状调查基础上，评价了太湖各期营养程度，并分析了35年来主要营养物含量发展趋势。 |
| 7. | Pyramid of biomass a type of ecological pyramid based on the total amount of living material at each trophic level in the community , which is normally measured by total dry weight or calorific value per unit area or volume , and shown diagrammatically
生物量金字塔：指基于群落每个营养水平上有生命的物质总量的一种生态金字塔类型，通常通过总干重或者每单位面积或体积的生热量值来衡量，并用图表表示出来。 |
| 8. | The order euphausiacea consists of 86 or 87 species distributed over the ocean of the world , plays an important role in marine ecosystem , particularly in southern ocean , and is the key link of marine primarily productivity and higher trophic levels . krill fisheries are relatively recent developments . 47 species belonging to seven genera of two families in krill were recorded in china seas
磷虾是一类大型的海洋浮游动物，数量大，分布广，是海洋浮游动物的重要类群之一，在海洋生态系统中具有重要地位，尤其在南大洋，是维系海洋初级生产者与更高营养阶的主要环节之一；同时，磷虾又是许多经济鱼类的主要饵料，近年来，磷虾作为新兴的渔业资源正引起人们的高度重视。 |
