查询词典 trophic level

The maximization of the social strategy has the lowest trophic level 2.78 of all the strategies considered in this study.

由此可见，多鱼种捕捞策略的模拟是个复杂的任务，目标功能有时互相冲突，而且易受到初始模型条件的影响。

Based on the three bottom trawl surveys in adjacent waters of Changjiang estuary in June, August and October 2006, the composition and variation of the functional groups of high trophic level communities in the waters were studied.

通过对2006年6、8和10月在长江口及邻近海域3次调查采集样品的分析，对该水域的高营养层次生物群落的功能群组成及其变化进行了研究。

At each link in this food chain we can recognize three pathways to the next trophic level: decomposition, parasitism andpredation.

在这种食物链的每一个连接，我们能够辨别出通向下一个营养级的三条途径：分解、寄生和捕食。

The index of mean trophic level is used to access the condition of exploitation and usage of marine fishery resources in East China Sea.

结果表明，经过几十年的捕捞开发，东海区渔获物的平均营养级已从1965年的3.5下降到1990年的2.8，自1974年后海区的产量主要依靠捕捞低营养级品种如马面鲍等而获得。

About two-thirds of the world's people survive primarily by eating wheat,rice,and corn at the first trophic level,mostly because they cannot afford meat.

世界上有三分之二的人主要吃小麦，米等谷物维生，在连续的营养阶层中可以解释许多能量消逝。

If it really exists difference in food quality of seston, the difference can be recognized from the variation of fatty acid compositon in higher trophic level organisms.

当悬浮颗粒物在时空上存在数量和质量差异时，这种差异就可能在浮游动物中体现出来，而且通过脂肪酸的信息可以追踪到这种差异。

It was calculated that trophic level of macrofauna was between 2.0 and 3.7,and thus the macrobenthos of East Chongming tidal flat were primary and secondary consumers.

底栖动物的氮同位素能较好地反映其食性和营养位，计算出崇明东滩的大型底栖动物营养位在2.0～3.7，为一级消费者和二级消费者。

Located at the high trophic level of wetland ecosystem, and being sensitive to the changes occur in the entire ecosystem, waterbirds are important criteria for assessing the quality and importance of wetlands.

湿地鸟类位于湿地生态系统食物链的较高等级，对湿地生态系统所发生的变化非常敏感，因此，湿地鸟类是评价湿地质量及其敏感性的重要指标。

The first and lowest trophic level contains the producer, green plants that convert solar energy to food by photosynthesis.

第一层或称最底层营养水平包括生产者——通过光合作用将光能转化成为化学养料的绿色植物。

Then results of the fuzzy mathematics method were compared to the comprehensive trophic level index method ,and these were evaluated against the data.

模糊数学方法评价的结果是：河流入湖区与养殖区轻度富营养化，开阔水体、湿地保护区和全湖中营养。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。