trophic level

常見例句

The next best way to quantify the amount of protoplasm in each trophic level is to weigh it .
確定每一個(gè)營(yíng)養(yǎng)階層原生質(zhì)總量的第二個(gè)好辦法是稱重。
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The average trophic level of what is being caught is rising -- and this in principle should indicate improving ecosystem health.
食物鏈等級(jí)體系中的高等級(jí)物種平均捕獲率（而捕獲正在并將持續(xù)進(jìn)行）處于持續(xù)上升態(tài)勢(shì)之中——按照所謂食物鏈等級(jí)理論，這應(yīng)當(dāng)意味著海洋生態(tài)系統(tǒng)的健康平衡發(fā)生了變化。
The ecosystem appears to be a young weak one caused by overfishing, with small and low-valued fishes dominated and low ecotrophic efficiency for trophic level I.
系統(tǒng)受過(guò)度捕撈漁業(yè)影響很大，并存在營(yíng)養(yǎng)級(jí)I利用效率低和漁業(yè)資源小型化、低值化等不穩(wěn)定的幼態(tài)特征。