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相关概念视频

What is Biodiversity?01:19

What is Biodiversity?

Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Microbial Morphologies01:29

Microbial Morphologies

Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
Diversity of Protists I01:15

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

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相关实验视频

Updated: Jun 13, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
08:16

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

复杂性和多样性 复杂性和多样性

Michael Doebeli1, Iaroslav Ispolatov

  • 1Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC V6T 1Z4, Canada. doebeli@zoology.ubc.ca

Science (New York, N.Y.)
|April 24, 2010
PubMed
概括
此摘要是机器生成的。

频率依赖的选择可以维持生物多样性. 在高维的表型空间中,多种特征之间的复杂相互作用放松了这个过程的条件,使生物多样性更容易产生和维持.

更多相关视频

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community
11:28

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community

Published on: May 28, 2007

相关实验视频

Last Updated: Jun 13, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
08:16

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community
11:28

Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community

Published on: May 28, 2007

科学领域:

  • 进化生物学 进化生物学
  • 理论生态学理论生态学
  • 人口遗传学 人口遗传学

背景情况:

  • 推动生物多样性的起源和维持的机制仍然不完全理解.
  • 偏好罕见变异的频率依赖选择是维持遗传变异和促进物种化的已知机制.
  • 以前的模型表明,要在简单的,低维的表型空间中产生多样性,需要强烈的频率依赖.

研究的目的:

  • 研究多种特征之间的复杂相互作用如何影响频率依赖选择产生生物多样性的条件.
  • 通过依赖频率的选择来探索高维现型空间在促进多样性维护中的作用.

主要方法:

  • 在生态环境中依赖频率的选择的理论建模.
  • 分析与复杂特征相互作用相关的数学属性,特别是二次形式的固有值.
  • 检查具有高维度的表型空间,反映真实生物体的复杂性.

主要成果:

  • 当生态性质依赖于多个相互作用的特征 (高维的表型空间) 时,频率依赖选择产生多样性的条件显著放松.
  • 这些放松的条件在高维的表型空间中很容易满足,这表明频率依赖的应用范围更广.
  • 这种现象的数学基础与控制复杂特征相互作用中的二次形式的固有值的属性有关.

结论:

  • 在高维的表型空间中,众多特征之间的复杂相互作用增强了频率依赖选择驱动生物多样性的潜力.
  • 这一发现重新评估了频率依赖在所有生物体生物多样性的起源和维持中的重要性.
  • 该研究强调了在进化和生态模型中考虑特征复杂性和维度的重要性.