導入された種とその欠落した寄生虫.
Mark E Torchin1, Kevin D Lafferty, Andrew P Dobson
1Marine Science Institute and Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California 93106, USA. torchin@lifesci.ucsb.edu
Nature
|February 7, 2003
まとめ
寄生虫のような自然の敵から逃れるため,導入された種はしばしば害虫になります. この研究では,入侵種は寄生虫種が少なく,感染率は先住民族と比較して低いことが判明しました.
科学分野:
- エコロジー エコロジー エコロジー
- 侵入種 生物学 侵入種 生物学
- 寄生虫学とは,寄生虫学である.
背景:
- 導入された種は,高い人口密度と大きな体型のため,重要な生態学的被害を引き起こす可能性があります.
- 自然の敵,特に寄生虫からの脱出は,入侵種の成功を説明する重要な仮説です.
- 寄生虫は,密度と体サイズを減らすことで宿主集団を調節することができます.
研究 の 目的:
- 導入された種は,ネイティブ種よりも寄生虫が少ないという仮説を検証する.
- 寄生虫の富と感染の強さを比較するために,様々な宿主種のネイティブと導入された集団の間で.
主な方法:
- 寄生虫のコミュニティを比較し,26の異国宿主種を本来の範囲と導入範囲で比較した.
- 多様な宿主分類:軟体動物,甲殻類,魚,鳥,哺乳類,両生類,爬虫類を含む.
主要な成果:
- 導入された集団は,先住民族集団で見られる寄生虫種の数の半分を隠していた.
- 導入された集団は,ネイティブ集団と比較して,感染の強度 (感染者の割合) が低いことを示した.
結論:
- 侵入種は寄生性の減少を経験し,敵の放出仮説を裏付けている.
- 寄生性の減少に寄与する要因には,寄生虫の導入が失敗し,中間宿主が存在しないこと,そして寄生虫の宿主特有の制限が含まれます.
さらに関連する動画
07:56Methods for Rearing the Parasitoid Ganaspis brasiliensis, a Promising Biological Control Agent for the Invasive Drosophila suzukii
Published on: June 2, 2022
03:46A Simple Fecal Flotation Method for Diagnosing Zoonotic Nematodes Under Field and Laboratory Conditions
Published on: December 15, 2023
関連する概念動画
00:53Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
00:58Symbiosis
Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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...
02:40Epiphytes, Parasites, and Carnivores
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...
02:07Conservation 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.
01:22Microbial Interactions: Parasitism
Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...