trophic level

Mercury, DDT and BHC accumulate strongly in aquatic organisms and bear a direct ratio to the trophic level and mercury is more than the other two.

在蓟运河河口生态系统中，水生生物对汞、DDT、六六六均有很强的积累能力，体内积累量大体上有沿生物营养等级而增高的趋势，尤以汞最为明显。

In organism, positive relationships existed between PBDEs concentration, lipid content and δ 15N value. The influence of lipid content on organism acuminating PBDEs was much greater compared with the influence of trophic level of organism.

生物体中PBDEs的含量与脂含量和δ15N值均呈正相关，脂含量对生物体富集PBDEs的影响远比生物所处的营养级的影响大。

So new productivity in euphotic zone is assimilating capacity with carbon imported from outside and supporting capacity to product of high trophic level.

所以，新生产力表现为真光层对外部输入碳的同化能力和供次级或更高营养级生产所需营养的能力。

This article is based on background value monitoring in major branch rivers before Reservoir water storage, the author apply trophic level index approach to evaluate the background trophic level in Reservoir Area.

本文通过对三峡库区蓄水前主要一级支流富营养化背景值进行调查监测，并采用水体综合营养状态指数法，对库区次级河流水体富营养化背景进行了评价。

Producer The first TROPHIC LEVEL , in a food chain.

生产者:食物链中第一个营养级.

The fractions and distribution of bioavailable phosphorus in river sediments were studied in order to identify the trophic level of inflow rivers to the west of Taihu Lake.

为了解太湖入湖河道的营养状况，研究了太湖西部河流沉积物生物利用磷的组成与分布。

While Ζ S 1S 2 cos(Δα)/ PCV max, preying relationship absents, the former Eqs. shows two species in the same trophic level and the latter in more than one trophic level.

当ΖS1S2cos（Δα）/PCVmax时，不存在捕食关系，前式为同一营养级，后式为相隔一个至几个营养级。

These microscopic organisms are assigned a trophic level ( TL ) of 1.

这些微生物的营养级为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。