Scientists and environmentalists agree that the causes of the decline include overfishing and the destruction of spawning habitats .
科学家和环境学家都承认,导致鲑鱼数量下降的原因是过度捕捞和产卵生境的破坏。
Some highly specialised arctic species will probably become extinct as their habitats shrink and southern interlopers rush in .
一些北极特有的物种也会随着栖息地变小和南方动物的入侵最终灭绝。
Promoting and supporting measures to reduce and minimise external threats to the habitats and wildlife at the reserve .
推广和支持有助缓减保护区生境和生物所面对的外来威胁的措施。
The results show that sample areas in different habitats in ethnobotany researches are similar to that in ecological researches .
结果表明,不同生境中民族植物学的取样面积与植物生态学中的取样面积比较相近。
It is a scenario that many biologists have reason to fear , as man-made climate change wreaks havoc with natural habitats around the globe .
这是让许多生物学家都有理由恐惧的一幕,因为人为导致的气候变化使全球自然生存环境历经浩劫。
The four pictures were released to celebrate earth day , and show endangered habitats around the world .
发布的这四张照片是庆祝世界地球日,显示世界各地濒危的栖息地。
Given their fragile habitats and ancient history , these creatures warrant protection as evolutionary marvels .
就他们脆弱的栖息地和古老的历史而言,这些生物有必要被当作进化的奇迹加以保护。
The zoo offers views of koalas , kangaroos and other australian animals in their recreated habitats .
该动物园可看到考拉、袋鼠与其他澳大利亚土生动物在重新营造的栖息地里悠游。
Habitats provide humans with services such as water treatment , pollination and sediment capture .
生态环境提供给人类各种服务,例如水质的净化、授粉作用、沉积物俘获等。
Results composed of the total volatile oil over 90 % , 186 components were separated and identified . The effect on the content of ppfa from different habitats is remarkable .