作者sarcasm ()
看板geography101
标题Re: [环生] 生物累积与生物扩大
时间Wed Jan 12 23:07:46 2011
花几分钟随便乱翻的
有错别怪我XD
※ 引述《k8k12 (小昱)》之铭言：
: 如标题可以参考下列原文
: A third factor for some substances is bioaccumlation, in which some
: molecules are absorbed and stored in specific organs or tissues at higher than
: normal levels. As a consequence, a chemical found at a fairly low
: concentration
: in the environment can build up to a harmful level in certain organs and
: tissues.
第三个因素是生物累积，指的是比平均更多的分子被吸收并储存在特定器官或组织中，
使原本环境中含量极低的化学物质在器官和组织中累积达到有害的程度。
: A related factor is biomagnification, in which levels of some potential
: toxins in the environment become magnified as they pass through food chains
: and webs. Organisms at low trophic levels might ingest only small amounts of
: a toxin, but each animal on the next trophic level up that eats many of those
: organisms will take in increasingly larger amounts of that toxin. Examples of
: chemicals that can be biomagnified include long-lived, fat-soluble organic
: compounds such as DDT, PCBs (oily chemicals used in electrical transformers),
: and some radioactive isotopes (such as strontium-90)
另一相关要素是生物放大，指的是环境中潜在的毒物经过食物链和食物网後被放大，
层级较低的生物可能只会吸收少量毒素，但被下一层生物大量食入後
便会在其体内累积更大量的毒素。具有放大效应的化学物质包含持久脂溶性有机化合物，
如DDT、PCBs(用於变压器的油性化学物质)、和部分辐射性同位素(如锶九十)。
: 大家考试加油!
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◆ From: 140.112.4.195
1F：→ sevenchao:推英资哥!!! 01/12 23:11
2F：→ sarcasm:可是我觉得被我翻成中文更难理解XD 01/12 23:15
3F：推 js100:有下有推 01/12 23:20
4F：推 tryitman:一个是单个体的吸收，一个是食物链的高等生物累积，有差 01/12 23:33
5F：→ tryitman:得乌脚病(喝毒水)的叫生物累积，这样举例不知道会不会怪 01/12 23:35
6F：推 lily78323:楼上的举例是对的喔~ 01/13 01:08
7F：→ lily78323:不过应该不叫喝毒水吧XD 01/13 01:08