...Then, Belgian mathematician PF Verhulst (1804-49) showed that population growth follows an S-shaped (sigmoid) curve, formulated it, and in 1845 named it the logistic curve. Separately, R. Pearl (1879-1940), who discovered the logistic equation while studying population growth rates in the United States, attempted to verify it in experimental populations, and in 1922, together with SL Parker (1895-?), demonstrated that as population density increased, Drosophila melanogaster caused a decrease in egg production and an increase in mortality, and that as a result, population growth follows a logistic curve. This was essentially the first experimental proof of the density effect. ... *Some of the terminology that mentions "Pearl, R." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…続いて,ベルギーの数学者フェルフルストP.F.Verhulst(1804‐49)が,人口増加はS字型(シグモイド)曲線を描くことを示して定式化し,1845年にそれをロジスティック曲線と名づけた。 これとは別に,アメリカにおける人口増加率を調べる過程でロジスティック式を見いだしたパールR.Pearl(1879‐1940)は,実験個体群での検証を試み,1922年に個体群密度が増加するにつれてキイロショウジョウバエが産卵数の減少と死亡率の増加を引き起こし,結果的に個体群増加はロジスティック曲線を描くことをパーカーS.L.Parker(1895‐?)とともに明らかにした。これが事実上最初の密度効果の実験的証明である。… ※「Pearl,R.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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