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首页> 外文期刊>Ecological research >Geographie Variation in nut size of Castanopsis species in Japan
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Geographie Variation in nut size of Castanopsis species in Japan

机译：日本of锥坚果大小的地理变化

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摘要

The environmental conditions affecting the geographic Variation in nut size of the Castanopsis species in Japan were examined. The mother trees having a rela-tively large nut tended to dominate in the geographically marginal area of the distribution ränge in Japan, i.e. the Japan Sea, Kanto, and Ryukyu areas, whereas in the central area, i.e. the Pacific area, mother trees having a relatively small nut occurred. We attempted an adaptive explanation, proposing that mother trees with large nuts have higher inclusive fitness than those with small nuts in unfavorable habitats. The Japan Sea area features large amounts of snow fall and low temperatures. The Ryukyu area is insular and is characterized by high temperatures. Within the Pacific area, mother trees with relatively large nuts were abundant at both higher and lower parts of the altitudinal ränge. We infer that environmental conditions in marginal areas, in terms of both horizontal and vertical distribution, favor mother trees having large nuts. How-ever, in the marginal Kanto area, the cause of the absence of mother trees having relatively small nuts was inde-pendent of the environmental conditions. The geographic Variation in nut size of Castanopsis species is not always explained by environmental factors.
机译：研究了影响日本the锥坚果大小地理差异的环境条件。坚果相对较大的母树倾向于在日本分布范围的边缘地区（即日本海，关东和琉球地区）占主导地位，而在中部地区（即太平洋地区），发生了相对较小的螺母。我们尝试了一种适应性的解释，提出在不利的栖息地中，坚果较大的母树比坚果较小的母树具有更高的包容性。日本海地区有大量降雪和低温。琉球地区是孤立的，具有高温特征。在太平洋地区，坚果树的坚果树相对较大，在海拔范围的较高和较低部分都有。我们推断，就水平和垂直分布而言，边缘地区的环境条件都有利于坚果大的母树。然而，在关东边缘地区，缺少具有相对较小坚果的母树的原因与环境条件无关。 Cast属植物坚果大小的地理差异并不总是由环境因素来解释。

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