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Optimal Foraging00:48

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.
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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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.
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関連する実験動画

Updated: May 11, 2026

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
10:50

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies

Published on: November 8, 2018

視覚的な捕食者は,仮想の獲物の暗号性とポリモルフィズムを選択します.

Alan B Bond1, Alan C Kamil

  • 1Nebraska Behavioral Biology Group, School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0118, USA.

Nature
|February 8, 2002
PubMed
まとめ
この要約は機械生成です。

共通の獲物の変種を攻撃する捕食者は,より頻繁に獲物を駆り立て,より良いカモフラージュとより大きなパターン多様性を進化させます. この周波数依存の捕食者は,デジタルモスとブルー・ジェイを用いてテストされました.

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関連する実験動画

Last Updated: May 11, 2026

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科学分野:

  • 進化生物学の進化生物学について
  • 行動生態学 行動生態学
  • 捕食者と獲物のダイナミクス

背景:

  • 謎めいた動物におけるフェノタイプの多様性は一般的です.
  • 共通の変種がより多く攻撃される周波数依存の捕食は,この多様性を促進する可能性があります.
  • この仮説には直接的な実験的証拠が欠けていた.

研究 の 目的:

  • 実験的に,餌食の暗号化と現象型変異を誘導する周波数依存の捕食の役割をテストする.
  • 捕食者の捜索戦略とその獲物の進化への影響について調査する.

主な方法:

  • コンピュータのモニターでブルージェイ (Cyanocitta cristata) に提示されたデジタルモールを用いた制御実験.
  • 蝶のフェノタイプは遺伝アルゴリズムによって進化し,検出された個体に対して選択された.
  • 周波数依存選択による進化したの集団と対照群の比較.

主要な成果:

  • ブルージャイは周波数依存の捕食性を示し,珍しいの変種を検出できませんでした.
  • これにより,が増幅された暗号化 (検出の難しさ) を進化させた.
  • 進化したの個体群は,対照群と比較して,有意に大きな表型変異を示した.

結論:

  • 周波数依存の捕食は,獲物の暗号化と現象型多様性の重要な要因である.
  • 捕食者は,一般的な獲物を好む"画像検索"を使用し,無意識に希少な多様性を促進する可能性があります.
  • このメカニズムは,自然集団における多様な暗号的パターンの維持を説明できる.