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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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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

複雑性と多様性

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
まとめ
この要約は機械生成です。

周波数依存の選択によって生物の多様性が保たれる. 高次元の現象型空間における複数の特徴間の複雑な相互作用は,このプロセスの条件を緩和し,生物多様性の生成と維持を容易にする.

さらに関連する動画

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

関連する実験動画

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

科学分野:

  • 進化生物学の進化生物学について
  • 理論的なエコロジー
  • 人口遺伝学 人口遺伝学

背景:

  • 生物多様性の発生と維持を促すメカニズムは,未だに完全に理解されていない.
  • 稀な変異を好む周波数依存的選択は,遺伝的多様性を維持し,種種化を促進する既知のメカニズムである.
  • 以前のモデルは,単純で低次元な現象型空間で多様性を生み出すには,強い周波数依存が必要であることを示していた.

研究 の 目的:

  • 複数の特性の複雑な相互作用が,生物多様性を生み出すために,周波数依存選択の条件にどのように影響するか調査する.
  • 周波数依存選択による多様性の維持を促進する上で,高次元の現象型空間が果たす役割を調査する.

主な方法:

  • 生態学的文脈における周波数依存選択の理論的モデリング.
  • 複雑な特性の相互作用に関連する数学的性質,特に二乗形の固有値の分析.
  • 現実の生物の複雑さを反映した,高次元性のフェノタイプ空間の研究.

主要な成果:

  • 生態学的性質が複数の相互作用する特徴 (高次元の現象型空間) に依存している場合,多様性を生み出す周波数依存選択の条件は著しく緩和されます.
  • これらのリラックスした条件は,高次元の現象型空間では容易に満たされ,周波数依存のより広範な適用性を示唆します.
  • この現象の数学的根拠は,複雑な特性の相互作用における二次的な形を支配する固有値の性質と結びついている.

結論:

  • 高次元の現象型空間における多数の特徴の複雑な相互作用は,生物多様性を駆動する周波数依存の選択の可能性を高めます.
  • この発見は,すべての生物体における生物多様性の起源と維持における周波数依存の重要性を再評価するものである.
  • この研究は,進化的および生態学的モデルにおける特性の複雑性と次元性を考慮することの重要性を強調しています.