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相关概念视频

Conservation of Small Populations02:04

Conservation of Small Populations

13.4K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
13.4K
Conservation of Declining Populations02:07

Conservation of Declining Populations

9.7K
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.
9.7K
What are Populations and Communities?00:30

What are Populations and Communities?

34.8K
Overview
34.8K
Predator-Prey Interactions02:39

Predator-Prey Interactions

18.8K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
18.8K
Sample Proportion and Population Proportion01:20

Sample Proportion and Population Proportion

5.6K
Collecting samples or responses from an entire population takes significant time and effort, so a researcher collects responses from only a sample of that population. Suppose a study needs to collect information about a specific mobile application. After sample collection, the researcher analyzes the data and discovers that most individuals in the sample use that specific mobile application. The sample proportion measures the number of individuals in a sample who either use or don't use the...
5.6K
Testing a Claim about Population Proportion01:24

Testing a Claim about Population Proportion

3.4K
A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
3.4K

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相关实验视频

Updated: Sep 7, 2025

A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae
04:51

A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae

Published on: July 8, 2025

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一个新的北极熊种群

Elizabeth Peacock1

  • 1Department of Emergency Medicine, Emory University School of Medicine, Atlanta, GA. USA.

Science (New York, N.Y.)
|June 16, 2022
PubMed
概括

国际保护协议可能不足以保护临灭绝的熊. 需要进一步的研究来评估目前熊群保护策略的有效性.

科学领域:

  • 保护生物学
  • 野生动物生态
  • 国际政策

背景情况:

  • 熊种群面临许多威胁,
  • 国际保护协议旨在减轻这些威胁.
  • 这些协议对保护熊的有效性仍然不确定.

研究的目的:

  • 评估国际保护协议保护熊种类的潜力.
  • 确定影响熊保护工作成功的关键因素.

主要方法:

  • 对熊群动态的现有文献进行审查.
  • 对国际保护协议的范围和执行进行分析.
  • 对不同地区的保护成果进行比较研究.

主要成果:

  • 协议的现有框架可能在解决熊的具体威胁方面存在局限性.
  • 实施和执行的区域差异影响了保护的成功.
  • 缺乏足够的关于该协议对熊群的直接影响的数据.

结论:

  • 国际保护协议提供了一个框架, 但需要加强有效保护熊的战略.
  • 应对息地碎片化和非法野生动物贸易至关重要.

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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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相关实验视频

Last Updated: Sep 7, 2025

A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae
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A Modified Mirror Test as a Visual Guide for the Self-awareness Trait in Wild Antarctica Penguins, Pygoscelis adeliae

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A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals
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A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals

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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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  • 持续监测和适应性管理对于熊的长期生存至关重要.