関連する実験動画
Updated: Jul 19, 2026

07:34
Milk Collection Methods for Mice and Reeves' Muntjac Deer
Published on: July 19, 2014
哺乳類の減少と絶滅危機
Gerardo Ceballos1, Paul R Ehrlich
1Instituto de Ecologia, Universidad Nacional Autonoma de Mexico, Apdo, Postal 70-275, Mexico D.F. 04510, Mexico. gceballo@miranda.ecologia.unam.mx
まとめ
主要な指標性哺乳類の個体群は,主に人間の集中的な活動により,歴史的な範囲の半分以上を失っている. この大きな生息地喪失は,世界の種の多様性や生態系サービスに対する深刻な脅威を示しています.
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
- 生物多様性 科学 科学 生物多様性
背景:
- 人口減少は種の絶滅の前兆である.
- 主要な指標分類の現在の集団損失に関する地理的に明示的なデータは不足しています.
- 範囲の喪失を理解することは,効果的な保全戦略にとって極めて重要です.
研究 の 目的:
- 減少している哺乳類種の現在の人口損失を推定する.
- 範囲の縮小により最も影響を受ける地理的地域を特定する.
- 範囲の喪失が生物多様性や生態系サービスに及ぼす影響を評価する.
主な方法:
- 比較された過去と現在の地理的分布.
- 6つの大陸で173種の減少している哺乳類のデータを分析した.
- 人間の活動強度と相関する範囲喪失.
主要な成果:
- 選択された哺乳類の種は,歴史上の範囲の50%以上を失っている.
- 範囲収縮は,人間の活動が集中している地域で最も深刻です.
- これは,生態系サービスと財の重大な損失を暗示しています.
結論:
- インジケーター哺乳類の広範囲の減少は,世界の種の多様性に重大な脅威をもたらしています.
- 人口のさらなる減少と生息地の破壊を緩和するために,緊急の保全行動が必要である.
- この発見は,哺乳類の個体数と生態系の健康に対する人間の活動の重大な影響を強調しています.
関連する概念動画
Population Growth
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
Threats to Biodiversity
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...
What is Conservation Biology?
Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials.
Conservation of Small Populations
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 likely to...
Conservation of Declining Populations
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.
Habitat Fragmentation
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.

