西せい限げん

noun

western limit; western boundary of distribution

Technical term used in biogeography and ecology for the westernmost extent of a species' range. Often contrasted with 東限 (eastern limit).

• この植しょく物ぶつの西せい限げんは九きゅう州しゅう南なん部ぶとされている。

  The western limit of this plant is considered to be southern Kyushu.

• 分ぶん布ぷの西せい限げんを調しらべるために調ちょう査さを行おこなった。

  We conducted a survey to investigate the western limit of the distribution.