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相关概念视频

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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 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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Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
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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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逆行性解衰退导致北极流无脊椎动物的干扰模式发生变化.

Maria Dolan1, Jordan Musetta-Lambert2, Krista S Chin3

  • 1Wilfrid Laurier University, Waterloo, Canada.

Global change biology
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概括

气候变化驱动的永久土融继续降低北极水生息地. 盆地宏观无脊椎动物群体表现出持续的低丰度,并由于高总悬浮固体 (TSS) 而向耐扰物种转移.

关键词:
北极的淡水生物多样性北极的河流是北极的河流盆地宏观无脊椎动物气候变暖 气候变暖干扰系统的干扰制度.长期监测 长期监测 长期监测永久土的融化正在发生.融解会导致经济衰退.

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科学领域:

  • 环境科学 环境科学
  • 生态生态学 生态生态学
  • 水文学的水文学

背景情况:

  • 永久土融是影响水生生态系统的重要北极干扰.
  • 这些沉降会增加总悬浮固体 (TSS) 和营养物质,影响水质和生物多样性.
  • 以前的研究表明,受影响的流域的无脊椎动物数量和多样性减少.

研究的目的:

  • 评估永久土融化的下降对地宏观无脊椎动物 (BMI) 的十年级影响.
  • 为了评估水质变化的持久性和生物多样性在长时间暴露后的恢复.
  • 确定北极流中BMI社区组成的驱动因素.

主要方法:

  • 将2010-2014年的环境和BMI数据与2021年的抽样活动进行了比较.
  • 分析了总悬浮固体 (TSS),营养度以及BMI的丰度和多样性.
  • 相关的BMI指标与上游融化低谷和降水水平的数量.

主要成果:

  • 在过去十年中,高TSS和营养度在受经济衰退影响的地区持续存在.
  • 在受影响的河流中,本土巨无脊椎动物的数量仍然显著下降.
  • 观察到受干扰耐受性类型的丰富性和丰富性增加,与降水量减少有关,香农-韦纳多样性增加.

结论:

  • 永久土融导致北极水生息地长期退化.
  • TSS 作为盆地宏观无脊椎动物的持续性压力因素,阻碍了恢复.
  • 融化衰退的数量是BMI社区的关键驱动因素,随着衰退的增加,未来的风险越来越大.