FORMULATION AND ESTIMATION OF THE EFFECTIVE SIZE OF STAGE‐STRUCTURED POPULATIONS IN FRITILLARIA CAMTSCHATCENSIS, A PERENNIAL HERB WITH A COMPLEX LIFE HISTORY
FORMULATION AND ESTIMATION OF THE EFFECTIVE SIZE OF STAGE‐STRUCTURED POPULATIONS IN FRITILLARIA CAMTSCHATCENSIS, A PERENNIAL HERB WITH A COMPLEX LIFE HISTORY
复制标题
具有复杂生活史的多年生草本植物白贝母阶段结构种群有效规模的制定和估计
DOI：
10.1111/j.0014-3820.2000.tb01244.x
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发表时间：
2000
期刊：
影响因子：
3.3
通讯作者：
Hiroko Zentoh
中科院分区：
文献类型：
--
作者：
K. Yonezawa;E. Kinoshita;Yasuyuki Watano;Hiroko Zentoh
基于阶段结构种群模型，对川贝母（Fritillaria camtschatcensis（L.）凯尔高（百合科），一种多年生，主要是无性繁殖的草本植物。这些种群中的植物每年都在改变生活史阶段，在三个明确可识别的阶段中向上或向下：一叶，不开花;多叶不开花;和多叶，开花阶段。所有阶段的植物每年都产生克隆后代（小鳞茎），植物的死亡只发生在第一阶段。种群在种群规模和阶段结构上都接近平衡。据估计，Ne是人口普查人口规模（N）的20 - 30%，导致预测约20，000或更多的人口规模将需要保存基因多样性的正常水平（Ne≥ 5000）。根据该物种目前的人口统计模式，第一阶段植物的加速生长以及第二阶段和第三阶段植物的存活率降低将增加种群的年（Ny/N）和世代时间（Ne/N）有效大小。
The effective population size (Ne) is formulated based on a stage‐structured population model and is estimated for two populations of Fritillaria camtschatcensis (L.) Ker‐Gawl. (Liliaceae), a perennial, mainly clonally reproducing herb. Plants in these populations change life‐history stages year by year, either upward or downward across three unambiguously identifiable stages: one‐leaf, nonflowering; multileaf nonflowering; and multileaf, flowering stages. Plants of all stages produce clonal progeny (bulblets) each year, and death of plants occurs only in the first stage. The populations are nearly at equilibrium in both population size and stage structure. Ne is estimated to be 20‐30% of the census population size (N), leading to the prediction that a population size of about 20,000 or more will be needed to conserve the normal level of the gene diversity (Ne≥ 5000). With the current demographic pattern of this species, accelerated growth of the first‐stage plants with reduced survival of the second‐ and third‐stage plants will increase both the annual (Ny/N) and generation time (Ne/N) effective sizes of population.