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相关概念视频

Formation of Species01:31

Formation of Species

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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What is a Species?01:17

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Overview
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Genome Size and the Evolution of New Genes03:21

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Human civilization relies on biodiversity in many ways. Sudden changes in species biodiversity result in environmental changes that can modify weather patterns and therefore human civilizations.
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Keystone Species01:39

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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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相关实验视频

Updated: Jul 27, 2025

Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches
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一个新的物种的新物种.

Yuzheng Ke1, Imran A Rahman2,3, Hanchen Song1

  • 1School of Earth Science, China University of Geosciences (Wuhan), Wuhan, Hubei, People's Republic of China.

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|June 5, 2023
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概括

在中国发现了一种新的大型海物种Nanhsiungchelys yangi.

关键词:
前两侧的过程.在南市的小里.南雄盆地是南雄的盆地.人类遗传学分析上白时期的上白时期.

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科学领域:

  • 古生物学的古生物学
  • 脊椎动物古生物学 脊椎动物古生物学
  • 中生代爬行动物 中生代爬行动物

背景情况:

  • 纳西切利科 (Nanhsiungchelyidae) 是一种已灭绝的白纪的大型海.
  • 化石发现提供了关于古代切洛尼亚人的进化和多样性的见解.

研究的目的:

  • 为了描述一个新物种的nanhsiungchelyid海,Nanhsiungchelys yangi sp. 在新的一年里.
  • 为了分析南阳科家族内的遗传关系.
  • 为了研究 Nanhsiungchelys yangi.独特的甲特征的潜在功能.

主要方法:

  • 对保存良好的化石头骨,下和部分/胎盘进行形态分析.
  • 与已知Nanhsiungchelyidae物种进行骨科比较.
  • 使用形态学数据进行了家族遗传学分析.
  • 计算流体动力学模拟,以评估甲过程的功能.

主要成果:

  • 描述了Nanhsiungchelys yangi,其特点是三角形的鼻子和宽的前侧.
  • 遗传学分析将N. yangi和Nanhsiungchelys wuchingensis作为姐妹种群.
  • 在现存的海中缺少的前侧过程可能有助于头部保护或水力动力学.

结论:

  • 发现Nanhsiungchelys yangi扩大了我们对亚洲白纪乌多样性的理解.
  • 独特的前两侧过程表明,在水生环境中,它们适应了防御或运动.
  • 在热纪的气候中,南甲基类动物可能采用了温度调节行为,如泥浴.