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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.

对北海道三个地方种群的栖息地条件、繁殖特性和种群结构进行了调查。这种林下草本植物是日本最典型的春季短暂植物之一，该物种的栖息地受到土地利用变化的威胁。研究地点是位于该物种分布区最东端的谷野镇、旭川市的Tossho-zan和新藤川镇的Pin-Neshiri。Tanno镇的生长季温度条件比Toshozan和Pin-Neshiri.虽然在本州岛似乎是异交物种，但授粉实验表明Tanno种群不仅具有自交亲和能力，而且还具有自动授粉能力。旭川族略微兼具这两种能力，但平内西里人则没有。由叶面积确定的最大个体大小由大到小的顺序是Pin-Neshiri、Tosshzan、Tanno种群。这两种能力的大小似乎与研究地点的生境条件有关。Tossho-zan和Tanno种群的种群动态由Leslie矩阵模型模拟。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，这三个种群处于稳定的状态，灭绝的概率很低。需要进一步研究种群的遗传多样性，以及自交亲和性导致近亲交配耗尽的存在。