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関連する概念動画

Optimal Foraging00:48

Optimal Foraging

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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.
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Types of Selection01:46

Types of Selection

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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...
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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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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Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
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Mate Choice01:20

Mate Choice

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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Foraging Path-length Protocol for Drosophila melanogaster Larvae
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バランスの取れた選択は,密度依存の採食行動を形作る.

Joshua S Greene1, Maximillian Brown1, May Dobosiewicz1

  • 1Howard Hughes Medical Institute, Lulu and Anthony Wang Laboratory of Neural Circuits and Behavior, The Rockefeller University, New York, New York 10065, USA.

Nature
|November 4, 2016
PubMed
まとめ
この要約は機械生成です。

アスカロシドフェロモンの社会的情報は,C.elegansの餌探し行動に影響を与えます. srx-43のような遺伝子は,この密度依存戦略を媒介し,人口動態と進化に影響を与えます.

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科学分野:

  • 神経倫理学
  • 進化 的 な 遺伝子
  • 化学エコロジー

背景:

  • 最適な採食戦略は 社会的競争と行動戦略によって 影響を受けます
  • 遺伝的・神経的メカニズムが 社会的ヒントを採取する意思決定に 組み込むことは 未だほとんど未知のことです

研究 の 目的:

  • アスカロシドフェロモンが 集団密度をシグナリングし,カエノラブディティス・エレガンスの 餌探し行動にどのように影響するかを調査する.
  • 遺伝子や神経回路を特定し 社会的情報を感知し 採食決定を調節する

主な方法:

  • フェロモン感受性に関連した遺伝的位置を特定するために,定量的な特性の位置 (QTL) マッピングを使用した.
  • ASI感覚神経細胞におけるGタンパク質結合受容体遺伝子 srx-43の役割を調査した.
  • アスカロシド分泌と検出の自然な変動が採食戦略と競争力のある成長に与える影響を分析した.

主要な成果:

  • アスカロシドフェロモン,特にicas#9は,C. elegansの探索的な餌を抑制することが判明した.
  • 自然に分離された種は,遺伝的な代替食糧戦略に関連して,icas#9に対する異なる感受性を表しています.
  • ASIニューロンのアスカロシド受容体をコードするsrx-43遺伝子は,この密度依存の探索抑制の重要なレギュラーとして特定されました.
  • 2つの古代のsrx-43ハプロタイプは,アスカロシドシグナルと食糧の利用性に依存する競争上の優位性を与えます.

結論:

  • srx-43によって媒介されるアスカロシド感受性の遺伝的変異は,C.elegansの代替密度依存の餌探し行動を生成する.
  • srx-43の場所でのバランスの取れた選択は,これらの代替戦略をサポートし,狩猟ゲーム理論の予測と整合しています.