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相关概念视频

Migration00:53

Migration

Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
What is Conservation Biology?01:57

What is Conservation Biology?

Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials.
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Conservation of Declining Populations02:07

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.

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相关实验视频

Updated: Jun 30, 2026

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings
19:57

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

Published on: March 30, 2014

在非洲各地存在保护冲突.

A Balmford1, J L Moore, T Brooks

  • 1Conservation Biology Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK. a.balmford@zoo.cam.ac.uk

Science (New York, N.Y.)
|April 3, 2001
PubMed
概括
此摘要是机器生成的。

撒哈拉以南非洲的人口密度与高物种丰富度有关,挑战了保护假设. 这种重叠仍然存在,表明生物多样性保护与人类发展之间存在不可避免的冲突.

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Last Updated: Jun 30, 2026

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19:57

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Published on: March 30, 2014

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06:03

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Published on: September 4, 2016

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科学领域:

  • 保护生物学 保护生物学
  • 生态生态学 生态生态学
  • 生物多样性研究 生物多样性研究

背景情况:

  • 具有高度保护重要性的地区往往与人类定居点重叠.
  • 之前的研究表明,由于物种丰富性下降,随着人类影响和初级生产率的增加,冲突较低.

研究的目的:

  • 为了测试保护区和人类定居点之间的重叠的普遍性.
  • 分析撒哈拉以南非洲的人口密度和物种丰富之间的关系.
  • 评估对保护规划的影响以及与发展的潜在冲突.

主要方法:

  • 利用了撒哈拉以南非洲的1度分辨率数据.
  • 分析了人类人口密度和鸟类,哺乳动物,蛇和两动物的物种丰富性之间的相关性.
  • 检查了不同物种类别 (广泛分布,特有,危) 的物种丰富性模式.
  • 研究了物种丰富,人类影响和初级生产率之间的关系.

主要成果:

  • 在多种类型中发现人类人口密度和物种丰富之间存在正相关性.
  • 观察到,这种关联包括广泛,特有和危物种.
  • 通过发现物种丰富,人类影响和初级生产力之间的单模式关系,与早期的预期相矛盾.
  • 指出,许多人口密集的地区含有独特的物种,突出了保护的重要性.

结论:

  • 在撒哈拉以南非洲,人类人口密度与物种丰富之间的正相关性是一个重要的发现.
  • 在这种规模上,很难避免保护和发展冲突,因为独特的物种集中在居住区.
  • 未来的保护战略必须整合人类人口密度的考虑,以解决这些持续的冲突.