A concept proposed by E. Mayr (1942) to explain the relationship between the existence of two (or more) animal populations and geographical speciation, it is the opposite of allopatric. It is defined as "a state in which individuals or populations of different species are distributed in the same area." In general, the evolution of species requires a process of geographical isolation of populations (resulting in immiscibility of genes), and it is often thought that sympatric closely related species, as seen today, are maintained by secondary sympatry of species that have differentiated sufficiently to not interbreed. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
マイヤーE.Mayrが2種(以上)の動物個体群の在り方と地理的種分化の関係を説明するために提唱(1942)した概念で,異所性の対語。〈異なる種の個体または個体群が同じ地域に重複分布している状態〉と定義される。一般に種の進化には,個体群の地理的隔離の過程(それによる遺伝子の不混合)が必要とされ,通常現在みられるような同所性近縁種は,交雑しないほど十分に分化した種が二次的に同所性となって,それぞれの種を維持していると考えられる場合が多い。
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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