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関連する概念動画

Threats to Biodiversity01:50

Threats to Biodiversity

21.9K
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...
21.9K
Formation of Species01:31

Formation of Species

36.9K
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.
36.9K
Conservation of Small Populations02:04

Conservation of Small Populations

14.4K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
14.4K
Conservation of Declining Populations02:07

Conservation of Declining Populations

11.6K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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Habitat Fragmentation02:31

Habitat Fragmentation

15.8K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
15.8K
The Evidence for Evolution02:55

The Evidence for Evolution

40.3K
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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Updated: May 7, 2026

A Push-pull Protocol to Reduce Colonization of Bird Nest Boxes by Honey Bees
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A Push-pull Protocol to Reduce Colonization of Bird Nest Boxes by Honey Bees

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広範囲に広がる地元の家鳥の絶滅.

David G Hole1, Mark J Whittingham, Richard B Bradbury

  • 1Farmland Bird Group, Edward Grey Institute of Field Ornithology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. david.hole@linacre.ox.ac.uk

Nature
|August 29, 2002
PubMed
まとめ
この要約は機械生成です。

西ヨーロッパにおける家鳥の減少は,農業の強化による冬の食糧の減少による可能性が高い. この研究は,農村の家鳥の絶滅の主な原動力として,食料供給の減少を特定しています.

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科学分野:

  • エコロジー エコロジー エコロジー
  • 保護生物学の保護生物学
  • 鳥類学 鳥類学とは,鳥類学である.

背景:

  • ハウス・スパロウの個体数は西ヨーロッパ全域で著しく減少しています.
  • これらの人口減少の正確な原因は,公衆の懸念にもかかわらず,ほとんど特定されていないままです.

研究 の 目的:

  • 南イングランドにおける農村の家鳥の集団の広範な局所的な絶滅の背後にある主な要因を調査する.
  • 家鳥の集団動態における農業の集中と食糧の利用の役割を決定する.

主な方法:

  • フィールド実験を組み合わせた多面的なアプローチを使用しました.
  • 人口構造を理解するために組み込まれた遺伝分析.
  • 人口の生存可能性を評価するために,人口統計データを分析した.

主要な成果:

  • 農業の強化は,家鳥の冬の食糧供給の減少につながった.
  • この減少した食料の利用可能性は,南イングランド地方の地方絶滅の主要な原因として特定されています.
  • 農地にある家鳥の群れは,微細なスケールの遺伝子構造を示し,明確な源とシンク群れが特定されています.

結論:

  • 農耕の強化による冬の食糧供給の減少は,農村の家鳥の集団崩壊の最も可能性の高い説明である.
  • 人口構造 (源-沈没ダイナミクス) を理解することは,効果的な保全戦略にとって極めて重要です.
  • 鳥類の集団に対する農業の影響に関するさらなる研究が必要である.