食物链等级体系中的高等级物种平均捕获率(而捕获正在并将持续进行)处于持续上升态势之中——按照所谓食物链等级理论，这应当意味着海洋生态系统的健康平衡发生了变化。
The average trophic level of what is being caught is rising — and this in principle should indicate improving ecosystem health.
在此基础上，提出了开发符合烟台海洋生态旅游资源开发的主要战略思路以及相关的保障体系。
On the basement of the related theories, this paper puts forward the main strategic and related security system in accordance with marine eco-tourism resources development in Yantai.
在此基础上，提出了开发符合烟台海洋生态旅游资源开发的主要战略思路以及相关的保障体系。
On the basement of the related theories, this paper puts forward the main strategic and related security system in accordance with marine eco-tourism resources development in Yantai.
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