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Many land managers and ecologists also hold this view .

许多土地管理和生态学家也持有这样的观点。

Ecologists document the negative ripple effects of removing top predators from ecosystems .

生态学家证明把顶级掠食动物从生态系统中移除存在负面涟漪效应。

Nobody knows what will happen next in what ecologists see as a gigantic , unplanned , centuries-long experiment .

生态学家眼中这场庞大、毫无计划并将历经多个世纪的实验还在继续着，没有人知道接下来会发生什么。

Ecologists fear that if the integrity of the continuous habitat is interrupted , the whole system could be under threat .

生态学家担心，如果中断了候鸟在迁徙路线上连续栖息地的完整性，整个的生态系统可能受到威胁。

In the 20th century biologists ecologists and epidemiologists launched many long-term studies designed with an eye beyond their own time .

回首二十世纪，为了让研究视角超越时代局限，生物学家、生态学家和流行病学家曾展开了多项长期研究。