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相关概念视频

Global Climate Change01:50

Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Ecological Disturbance02:26

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An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
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Threats to Biodiversity01:50

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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...
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Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
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Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
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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.
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解冷地球:在普莱斯托时代后的气候环境中,为功能而重新利用野生气候.

Barry W Brook1, Guy F Midgley2

  • 1School of Natural Sciences, University of Tasmania, Sandy Bay, TAS, Australia.

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概括

快速上升的二氧化碳 (CO2) 水平正在改变生态系统,影响生物多样性和人类进化. 这种转变威胁到适应过去气候的物种,需要新的保护策略.

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人类世 (Anthropocene) 是一个人类世.整个全新纪 (Holocene) 的时间.普莱斯托时代 (Pleistocene) 的一个时期.生物多样性生物多样性恢复野生的时间.

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科学领域:

  • 古气候学 古气候学
  • 生态生态学 生态生态学
  • 进化生物学 进化生物学

背景情况:

  • 普世和全新世时代在不同的二氧化碳 (CO2) 水平下塑造了生态系统和人类进化.
  • 通常被认为是稳定的全新世纪,在人类二氧化碳排放改变这一轨迹之前,自然地向冰川阶段发展.
  • 低二氧化碳条件在历史上支持特定的动植物,这里定义为低二氧化碳依赖者.

研究的目的:

  • 分析大气二氧化碳上升对生态系统的影响,特别是非洲的沙漠,那里是智人进化.
  • 为了突出生物多样性适应开放生态系统的威胁,由于二氧化碳驱动的木材侵占和再造林.
  • 建议将气候适应性测试与史前类似物进行整合,以重建野生活动.

主要方法:

  • 普世和全新世气候条件及其生态影响的比较分析.
  • 评估二氧化碳驱动的植被变化,特别是非洲大草原的木质侵占.
  • 在不同的二氧化碳制度下对智人和其他大型哺乳动物的进化压力的审查.

主要成果:

  • 人类造成的二氧化碳排放逆转了自然的冰川化趋势,阻止了千年来回归周期性冰川气候.
  • 二氧化碳度的上升超过了许多物种和生态系统的适应能力,加速了全球变暖.
  • 历来由火和碳稀缺维持的非洲大草原,由于二氧化碳的增加,正在经历巨大的木质侵占.

结论:

  • 目前的Holocene基线是暂时的;保护和农业必须适应一个动态的,CO2驱动的未来.
  • 重生努力需要纳入气候适应性测试,预测未来的二氧化碳轨迹.
  • 系统性政策改革和地方干预对于应对快速气候变化造成的生物多样性丧失和生态系统转变至关重要.