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HABITAT AND REPRODUCTION OF DIRCA MEXICANA (THYMELAEACEAE)

机译:墨西哥DIRCA(THYMELAEACEAE)的栖息地和繁殖

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Little is known about the single reported population of Dirca mexicana. I monitored air temperature from mid-2005 through mid-2007, analyzed pH of soil, used the global positioning system (GPS) to define geographical boundaries of the population, explored for additional populations, and Studied aspects of sexual and asexual reproduction in situ and among seedlings in greenhouses. Temperature ranged from -2 to 35.5 degrees C, and weekly means were 7.4 to 18.1 degrees C. Soil pH was 6.3. No other Populations were found at sites nearby with similar slopes and aspects, but a second distinct cluster of plants was found 221 m from the portion of the known population described previously. Numerous individuals of Catasticta nimbice nimbice, a butterfly in the family Pieridae, visited flowers in mid-March, 2007. Drupes were observed in May four of five years, and drupe count per plant was 3 to 131 among individuals with basal trunk diameters of 10 to 46 mm in 2007. Genetic analysis of 45 individuals revealed no putative clones. Drupes of D. mexicana were longer and wider than those of the other two species in the genus, while size of seeds was intermediate. Seedlings isolated from pollinators in a greenhouse flowered for the first time and formed viable seeds during their fourth spring of development, demonstrating the capacity of D. mexicana to self-pollinate or to form seeds via apomixis. These observations improve our understanding of the habitat and reproductive biology of this endemic species.
机译:关于单一报道的Dirca mexicana的种群知之甚少。我监控了2005年中至2007年中的气温,分析了土壤的pH值,使用全球定位系统(GPS)定义了人口的地理边界,探索了其他人口,并研究了原地和无性繁殖的方面在温室中的幼苗之间。温度范围为-2至35.5摄氏度,每周平均值为7.4至18.1摄氏度。土壤pH为6.3。在附近具有相似坡度和坡度的站点上未发现其他种群,但在先前描述的已知种群部分的221 m附近发现了第二个不同的植物簇。 2007年3月中旬,无数的Catasticta nimbice nimbice(蝴蝶兰家族中的蝴蝶)造访了花朵。在5年的5月4日观察到核果,在基干直径为10的个体中,每株植物的核果数量为3至131。在2007年增加到46毫米。对45个个体的遗传分析表明没有推定的克隆。墨西哥D. mexicana的核果比其他两个种的核果更长和更宽,而种子的大小则中等。从温室中的授粉媒介中分离出的幼苗第一次开花,并在发育的第四个春天形成可行的种子,这证明了墨西哥D. mexicana自花授粉或通过无融合生殖形成种子的能力。这些观察结果提高了我们对这种特有物种的栖息地和生殖生物学的了解。

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