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関連する概念動画

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.
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Introduction to Plant Diversity02:22

Introduction to Plant Diversity

From Water to Land
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 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...
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...

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関連する実験動画

Updated: Jun 28, 2026

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

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

植物生物多様性のスケール依存性

M J Crawley1, J E Harral

  • 1Department of Biology, Natural Environment Research Council Centre for Population Biology, Imperial College, Silwood Park, Ascot SL5 7PY, UK. m.crawley@ic.ac.uk

Science (New York, N.Y.)
|February 7, 2001
PubMed
まとめ

重要な生態学的パターンである種と面積の関係では,傾き (z) が空間規模と生息地によって変化することを示しています. 異なる生態学的プロセスによって,様々なスケールで植物生物多様性が形成される可能性が高い.

科学分野:

  • コミュニティエコロジー
  • 生物多様性に関する研究は,
  • 空間エコロジー 空間エコロジー

背景:

  • 種と面積の関係は,基本的な生態学的パターンである.
  • 理論的モデルとデータは,物種豊かさ対面積のログ-ログプロットでは,一定の傾き (z ≈ 0.25) を示唆しています.
  • このパターンは,多様な植物と動物の分類群で観察されています.

研究 の 目的:

  • 異なる空間スケールと生息地における種面積関係斜率 (z) の変動性を調査する.
  • 一つのプロセスがすべてのスケールで種の豊かさを支配するか,スケールに依存するプロセスが作用しているかどうかを判断する.

主な方法:

  • イギリスの11の空間スケール (0.01~10^8m2) で複製・ランダム化された植物データを収集した.
  • エリアに対する種多様性のログ・ログのプロットの傾き (z) を分析した.
  • 異なる空間スケールと生息地における傾斜値の比較.

主要な成果:

  • 種と面積の関係における傾き (z) は一定ではない.
  • 斜面の値は,空間的なスケールと生息地のタイプによって体系的に変化した.
  • 小規模 (<100 m2) と大規模で低z値,中規模 (1 ha ~ 10 km2) で高z値が観測されました.

さらに関連する動画

A Method for Quantifying Foliage-Dwelling Arthropods
08:20

A Method for Quantifying Foliage-Dwelling Arthropods

Published on: October 20, 2019

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
09:23

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning

Published on: March 21, 2025

関連する実験動画

Last Updated: Jun 28, 2026

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

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

A Method for Quantifying Foliage-Dwelling Arthropods
08:20

A Method for Quantifying Foliage-Dwelling Arthropods

Published on: October 20, 2019

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
09:23

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning

Published on: March 21, 2025

結論:

  • 異なる生態系プロセスは,異なる空間スケールでの植物生物多様性に影響を与えます.
  • 種と面積の関係における一定の傾きを仮定することは,普遍的に当てはまらないかもしれません.
  • 規模に依存するプロセスは,生物多様性のパターンを理解する上で極めて重要です.