ハリケーンによる干渉と熱帯樹種の多様性
J Vandermeer1, I Granzow de la Cerda, D Boucher
1Department of Biology, University Herbarium, School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109, USA. jvander@umich.edu
Science (New York, N.Y.)
|October 29, 2000
まとめ
ハリケーンなどの大規模な熱帯雨林の破壊は,小規模な木の落下による差異とは異なり,種の多様性に影響を及ぼします. 主要なイベントでは先駆者種は限られており,時間の経過とともにより大きな全体的な種の蓄積を可能にします.
科学分野:
- エコロジー エコロジー エコロジー
- 林業 林業 林業 林業 林業
- 生物多様性 科学 科学 生物多様性
背景:
- 熱帯雨林における高木種の多様性は,重要な生態学的問題である.
- 木が倒れる隙間は,この多様性に影響を与える主要な干渉源と考えられています.
研究 の 目的:
- 大規模なハリケーンによる干渉が熱帯雨林の種蓄積パターンに与える影響を調査する.
- ハリケーン後の種の蓄積と,小規模な木の落下による干渉を比較する.
主な方法:
- ニカラグアでのハリケーン・ジョアン (1988) の後の10年間のデータセットを利用した.
- 分析された種の蓄積は,時間とともに,個別のサンプル採取が増えていく.
主要な成果:
- ハリケーン後の種の蓄積パターンは,小さな木の落下の隙間後のものと大きく異なります.
- 先駆者種の定着は,大規模な干渉で限られている.
結論:
- ハリケーンなどの大きな干渉は,小さな干渉と同じくらい効果的に他の種を抑制しません.
- 干渉の大きさの役割は,熱帯雨林の種多様性の維持に不可欠です.
関連する概念動画
01:50Threats 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...
02:22Introduction to Plant Diversity
From Water to Land
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
02:45Responses to Heat and Cold Stress
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
02:26Ecological Disturbance
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...