Conservation for regional populations of endangered plant species growing in seminatural ecosystems

保护半自然生态系统中生长的濒危植物物种的区域种群

基本信息

批准号：
13680660
负责人：
ISHIKAWA Yukio
金额：
$ 2.11万
依托单位：
Hokkaido College, Senshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

We investigated habitat condition, reproductive characteristics and population structure in three local populations of Erythronium japonicum in Hokkaido. This understory herb is one of the most typical spring ephemerals in Japan, and the habitat of the species has been threatened by land use changes. The study sites are Tanno town near the easternmost part of the distribution range of the species, Tossho-zan in Asahikawa City, and Pin-neshiri in Shintotsukawa town.The temperature condition of growing season was harsher in Tanno town than in Tosshozan and Pin-neshiri.Although E. japonicum seems to be an outcross species in the Honshu island, pollination experiments showed that the Tanno population has not only self compativility but also automatic self pollination ability. The Asahikawa population slightly has both abilities, but the Pin-neshiri population does not. Maximum individual size identified by leaf area was decreasing order from the Pin-neshiri, the Tosshozan, to the Tanno populations. The extent of both abilities seems to be accompanied with the habitat conditions of the study sites.Population dynamics was simulated by Leslie matrix model for the Tossho-zan and the Tanno populations. Regardless to initial growth rates of population, the probabilities of extinction were low not only in the Tossho-zan population but also in the Tanno population.Based on the results mentioned above, it is concluded that the three populations studied are in stable conditions, and have low probabilities of extinction. Further studies will be needed for genetic diversities of the populations, and for the presence of inbreeding depletion as a consequence of self compatibility.

我们调查了北海道三个当地刺蓟种群的栖息地条件、繁殖特征和种群结构。这种林下草本植物是日本最典型的春季短命植物之一，该物种的栖息地已受到土地利用变化的威胁。研究地点是该物种分布范围最东端的端野町、旭川市的Tossho-zan和新十津川町的Pin-neshiri。丹野町的生长季节温度条件比Tosshozan和Pin-neshiri更严酷。 neshiri.虽然E. japonicum似乎是本州岛的异型杂交物种，但授粉实验表明Tanno群体不仅具有自交亲和性，而且具有自动自交性授粉能力。旭川族群稍微具备这两种能力，但平内尻族群却没有。根据叶面积确定的最大个体尺寸从 Pin-neshiri、Tosshozan 到 Tanno 种群依次递减。这两种能力的程度似乎与研究地点的栖息条件有关。利用Leslie矩阵模型对Tossho-zan和Tanno种群进行了种群动态模拟。无论种群的初始增长率如何，无论是Tossho-zan种群还是Tanno种群，灭绝的概率都很低。根据上述结果，可以得出结论，所研究的三个种群均处于稳定状态，并且灭绝的可能性很低。需要进一步研究种群的遗传多样性，以及自交亲和性导致的近交耗竭的存在。