sympathetic

Japanese: sympatric
sympathetic

...Then, allopatric populations reach the level of species when they become reproductively isolated. After reproductive isolation occurs, the two species may become partially or completely sympatric. Regarding the question of whether speciation can occur in sympatric populations even without geographic isolation, isolation should not necessarily be considered as complete due to long distances or insurmountable barriers, but should be considered in terms of the relative strength of natural selection, which differentiates populations through changes in gene frequency, and chance drift, and sympatric speciation is possible. ...

*Some of the terminology explanations that mention "sympatric" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…そして異所性集団は生殖的に隔離されるに至って種の域に達する。生殖的隔離が生じた後は両種は部分的あるいは全面的に同所性sympatricになることもある。 地理的な隔離がなくても同所性集団で種分化が起こるかという問題については,隔離を必ずしも遠い距離とか越えがたい障害による完全なものだけでなく,遺伝子頻度の変化により集団を分化させる自然淘汰,機会的浮動との相対的な強さとして考えるべきで,同所性種形成の可能性はある。…

※「sympatric」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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