生物多样性和保护
国际文凭组织 · IB Diploma · 环境系统与社会 · SL 知识点 3 1:12 英语旁白 · 英中内嵌字幕
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These are selected topics, not the whole syllabus, and every example is fictional.
这些是精选主题，不是完整大纲，所有例子都是虚构的。
Richness counts species; evenness asks how evenly the individuals are shared.
丰富度数物种；均匀度看个体分布是否均匀。
Two sites each have 10 individuals of 3 species, so the same richness.
两个地点各有 3 个物种、10 个个体，所以丰富度相同。
Site A has counts 8, 1 and 1: one species holds 80 percent.
A 地计数 8、1、1：一个物种占 80%。
Site B has 4, 3 and 3: the top species holds 40 percent.
B 地 4、3、3：最多的物种占 40%。
B is more even.
B 更均匀。
Compare only surveys with similar area, effort and season.
只比较面积、努力程度和季节相近的调查。
Fragmentation can matter even when the total area hardly changes.
即使总面积几乎不变，破碎化也会产生影响。
One continuous habitat lets animals move and genes flow across it.
连续的栖息地让动物移动、基因流动。
Cut by roads into four fragments of the same total area, each patch is isolated and has more edge.
被道路切成四块总面积相同的碎片后，每块都被孤立，边缘更多。
A conservation plan must state whether it protects habitats, populations or genetic diversity.
保护计划必须说明保护的是栖息地、种群还是遗传多样性。
Check yourself.
自我检测。
Four species were recorded, so richness is 4.
记录到四个物种，丰富度为 4。
Ten thousand individuals of one species still have richness 1.
同一物种一万个个体，丰富度仍是 1。