trophic level

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

这些微生物的营养级为1.

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。

Producer The first TROPHIC LEVEL , in a food chain.

生产者:食物链中第一个营养级.

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。

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。