Nichos ecológicos
Diploma del Bachillerato Internacional · IB Diploma · Biology · HL Tema 19 4:29 Narración en inglés · Subtítulos en inglés + 中文 quemados en pantalla
Capítulos
Transcripción
Two species can share a habitat while using different resources or using the same resource at different times.
两个物种可以在同一栖息地中生活，但利用不同的资源，或者在同一时间使用相同的资源。
A niche describes more than a location.
生态位描述的内容远不止一个位置。
An ecological niche includes how an organism uses resources, responds to conditions and interacts with other organisms.
生态位包括生物如何利用资源、对环境条件的响应以及与其他生物的相互作用。
A fundamental niche describes potential conditions without restrictive biotic interactions in the model; a realized niche describes the conditions occupied when those interactions operate.
在模型中，基础生态位描述了在没有限制性生物相互作用下的潜在条件；而实际生态位则描述了当这些相互作用发生时生物所占据的条件。
Competition can restrict resource use or distribution.
竞争可能会限制资源的使用或分布。
An ecological niche is defined as the resource use, conditions and interactions associated with an organism’s role.
生态位是指与生物角色相关的资源利用、条件和相互作用。
Resource partitioning refers to differences in resource use that can reduce overlap among organisms.
资源分割是指可以减少生物间重叠的资源利用差异。
Separate a habitat observation from a causal claim about a niche boundary.
将栖息地观察与关于生态位边界的因果主张区分开来。
Absence from a site can reflect dispersal, detection, abiotic conditions, or interactions.
某物种在特定地点的缺失可能反映扩散能力、检测难度、非生物条件或种间相互作用。
Resource partitioning can reduce overlap, but an observational difference alone does not prove that competition caused it.
资源分割可以减少生态位重叠，但仅凭观察到的差异并不能证明这是竞争导致的结果。
Compare alternative explanations and the timescale of evidence.
请比较其他可能的解释以及证据的时间尺度。
In the lab: Use permitted field observations or an attributed dataset.
在实验室中，使用经许可的野外观察数据或已标注的数据集。
Record species identification confidence, resource category, time, abiotic conditions and sampling effort.
记录物种鉴定置信度、资源类别、时间、非生物条件及采样努力程度。
Repeat observations at several locations rather than choosing only patches that fit the hypothesis.
应在多个地点重复观察，而非仅选择符合假设的样地。
Non-destructive comparisons or approved models should be used instead of removing native species or introducing competitors.
应使用非破坏性比较方法或经批准的模型，避免移除本地物种或引入竞争者。
Known: fictional birds A use resource categories in counts 18, 9 and 3 out of 30 observations; birds B use 3, 9 and 18.
已知：虚构鸟类A在30次观察中使用的资源类别数量分别为18、9和3；鸟类B使用的数量分别为3、9和18。
Their shared middle category is 30 percent for each, but the preferred categories differ.
它们共同的中位类别占比均为30%，但偏好的类别不同。
This is evidence of different observed resource use.
这是观测到的资源利用差异的证据。
It does not alone establish their full niches or demonstrate the cause of the difference.
但这本身并不能确立它们的完整生态位，也无法证明这种差异的原因。
Your turn: A species uses one resource in 12 of 40 feeding observations.
轮到你了。 某物种在40次摄食观察中有12次使用了一种资源。
Calculate the observed percentage.
请计算其观测百分比。
Pause the video and work it out.
请暂停视频，自己算一算。
Check: 12 divided by 40 is 30 percent.
核对：12 ÷ 40 = 30%。
A niche is not identical to a trophic level or a habitat.
生态位并不等同于营养级或栖息地。
A realized niche is a context-dependent model, and an incomplete survey cannot establish every tolerance limit or competitive interaction.
实际生态位是一个依赖于情境的模型，不完整的调查无法确定所有的耐受极限或竞争相互作用。
Not true: Two species living in the same habitat necessarily have identical ecological niches.
这种说法不正确。 两种生活在同一栖息地的物种，其生态位不一定完全相同。
Species sharing a habitat can partition it - different foods, times or microsites - so identical location does not mean identical niches.
共享栖息地的物种可以通过利用不同的食物、时间或微生境来分割资源。 因此，相同的地理位置并不意味着相同的生态位。
Competition actually pushes coexisting species apart in their resource use.
竞争实际上会使共存物种在资源利用上彼此分离。
An ecological niche includes how an organism uses resources, responds to conditions, and interacts with other organisms.
生态位包括生物体如何利用资源、对环境条件作出反应以及与其它生物体相互作用的方式。
Separate a habitat observation from a causal claim about a niche boundary.
请将栖息地观察与关于生态位边界的因果主张区分开来。
Watch for: A niche is not identical to a trophic level or a habitat.
请注意：生态位并不等同于营养级或栖息地。
A species uses one resource in 14 of 35 feeding observations.
一个物种在35次摄食观察中有14次使用了一种资源。
Find the percentage.
求百分比。
Absence from a site is not by itself a niche boundary.
某地 absence 本身并不构成生态位边界。
Species A was seen feeding on resource one in 18 of 30 observations.
物种A在30次观察中有18次取食资源一。
That shows its observed resource use, not its whole niche.
这表明它被观察到的资源利用情况，而不是它的完整生态位。
Fictional birds use seeds and insects in counts of 18 and 12, and of 6 and 24.
虚构鸟类利用种子和昆虫的次数分别为 18 和 12，以及 6 和 24。
Compare resource proportions.
比较资源比例。
Does overlap prove competition?
重叠是否证明存在竞争？
Seed use is 60 percent and 20 percent, and both groups use both resources.
两组鸟类取食种子的比例分别是 60% 和 20%，而且两组都利用这两种资源。
Overlap alone does not prove resource limitation or competition; availability, season and interactions need evidence.
仅凭重叠并不能证明资源受限或存在竞争；资源可得性、季节和相互作用都需要证据。
Pause and check yourself. Explain each point on screen in your own words, then change one number in the last example and say which assumption must still hold.
暂停一下，自我检查：用自己的话解释屏幕上的每个要点，再改动最后一个例子中的一个数字，说明哪个假设仍然必须成立。