森の昆虫に対する鳥の捕食:排除実験

R T Holmes, J C Schultz, P Nothnagle

Science (New York, N.Y.)

|October 26, 1979

まとめ

鳥は,特に昆虫の数が少ない場合,森林昆虫の個体数を大幅に減少させます. 鳥によるこの捕食は,昆虫の個体数を調節し,自然選択を促す重要な要因として機能します.

科学分野:

エコロジーエコロジーエコロジー
動物学動物学
エントモロジーエントモロジー学

背景:

鳥の捕食は,森林の生態系における昆虫集団に影響を与える重要な要因である.
草食動物集団の規制における鳥の役割を理解することは,森林の健康にとって極めて重要です.

研究の目的:

鳥の捕食が,森林下の植生におけるレピドプテラの幼虫の密度に与える影響を調査する.
鳥の捕食が,特に低密度で,昆虫集団の集団規制および/または選択剤として作用するかどうかを判断する.

主な方法:

排除実験は,鳥類が森林の下木植物の特定の領域へのアクセスを防ぐために行われました.
昆虫 (レピドプテラの幼虫) の密度は,コントロール (鳥に開放) と実験 (鳥を除く) のプロットの両方で監視されました.

主要な成果:

排除実験では,鳥類がアクセスできる土地で,レピドプテラの幼虫の密度が有意に低下していることが示されました.
鳥の捕食の影響は,最初の昆虫の密度が低いときにより顕著でした.

結論:

鳥は,森林の昆虫集団,特にレピドプテラを制御する上で重要な役割を果たします.
鳥の捕食は,規制メカニズムと選択力の両方として機能し,特に低密度条件下で,昆虫集団を形作る.

さらに関連する動画

08:20

A Method for Quantifying Foliage-Dwelling Arthropods

Published on: October 20, 2019

06:19

Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night

Published on: December 29, 2021

関連する概念動画

02:07

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.

00:48

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.

01:28

Microbial Interactions: Predation

Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...

02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...

02:31

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.

01:50

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...

関連する実験動画