但是这份报告哀叹道：当前有数不胜数的交易及收获中的野生产品严重缺乏监督，结果导致生物栖息地退化，物种资源衰竭。
But the report laments that far too much of the harvesting of, and trade in, wild products is poorly supervised, with the result that habitats are degraded and stocks depleted.
数值效应是明显的：退化地区的鲑鱼数量比原始地区少；然而，栖息地的丧失也有可能减少遗传多样性。
The numerical effect is obvious: there are fewer salmon in degraded regions than in pristine ones; however, habitat loss also has the potential to reduce genetic diversity.
由于栖息地的丧失或退化，外来物种、气候变化、过度采伐、环境污染以及野生物疾病的影响，各类物种正在受到威胁。
Species are being threatened by habitat loss and degradation, invasive species, climate change, over-exploitation, pollution and wildlife disease.
我们知道是什么原因导致了野生老虎数量的下降，这些原因就是：非法偷猎；非法野生动植物贸易；变更用途、侵占和土地退化导致的栖息地丧失。
We know what is causing the decline in Numbers of wild tigers: illegal poaching; illegal wildlife trade; loss of habitat through conversion, encroachment, and land degradation.
对邻近河流树木的采伐也会增加河流中的沉淀和污浊度，降低水质和退化河岸动植物栖息地。
Harvesting adjacent to streams can increase sedimentation and turbidity in streams, lowering water quality and degrading riparian habitat.
因为刀耕火种和伐木作业，低地雨林栖息地的丧失和退化威胁着这种蜥蜴的生存。
The loss and degradation of lowland forest habitat through conversion of land for agricultural use and logging operations is a threat to this lizard.
里海海豹，也由于不可持续的狩猎和栖息地的退化而濒临灭绝，其数量已经在过去的100年中减少了百分之九十。
The Caspian seal, also now endangered, has declined in population by 90 percent over the past 100 years because of unsustainable hunting and degradation of its habitats.
里海海豹，也由于不可持续的狩猎和栖息地的退化而濒临灭绝，其数量已经在过去的100年中减少了百分之九十。
The Caspian seal, also now endangered, has declined in population by 90 percent over the past 100 years because of unsustainable hunting and degradation of its habitats.
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