• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Conservation Biology >Population size and reproduction in Phlox pilosa
【24h】

Population size and reproduction in Phlox pilosa

机译：福禄考的人口规模和繁殖

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We analyzed the relationships between population size and reproductive characteristics in the perennial prairie forb Phlox pilosa, an obligate outcrossing butterfly-pollinated species. We examined 27 populations ranging in size from 9 to over 75,000 flowering ramets in two regions of the state Iowa (eastcentral and northwest) in 1993 and 1994. We collected fruiting ramets from each population at the end of the Phlox growing season and scored them for height, biomass and reproductive variables, including the number of flowers initiated correlated with the number of capsules matured per ramet. Differences between populations in capsule production were set primarily at the population stage. In 1993, pollen arrival to stigmas was significantly lower and was correlated with population size in eastcentral Iowa population, indicating that lower reproduction in small populations that year was at least partially due to the inadequate amounts of pollen being moved. In 1993, weather conditions likely depressed pollinator activity, but absolute capsule formation was high because of high flower production per ramet and high population densities. In 1994, when pollen arrival to stigmas was relatively high and unrelated to population size, outcross pollen movement was greater in larger populations. Increased efficacy of outcross pollen movement between ramets or from variation between years in fine-scale spatial genetic substructuring of populations. Our results indicate that the viability of Phlox pilosa can be best ensured by protecting and creating populations of at least 1000-2000 flowering ramets. [References: 53]
机译：我们分析了多年生草原福布斯Plox pilosa（一种专为异型蝴蝶授粉的物种）中种群数量与生殖特征之间的关系。在1993年和1994年，我们检查了爱荷华州两个地区（中部和西北部）的27个种群，其大小从9到75,000多个开花分株。在福禄考生长季节结束时，我们从每个种群中收集了结果分株，并对它们进行了评分高度，生物量和生殖变量，包括起始花的数量与每个分株成熟的胶囊的数量相关。胶囊生产人群之间的差异主要是在人群阶段确定的。 1993年，花粉到达柱头的比例显着降低，并且与爱荷华州中东部人群的种群数量有关，这表明那年小种群繁殖率较低，至少部分原因是花粉移动量不足。 1993年，天气条件可能降低了授粉媒介的活动，但由于每株高产量的花和高密度的花，绝对的荚膜形成率很高。 1994年，当花粉到达柱头的数量相对较高且与种群数量无关时，较大种群中花粉的异样花粉运动更大。分株间异花粉运动的有效性提高，或种群的精细空间遗传子结构中不同年份之间的变异所致。我们的结果表明，通过保护和创建至少1000-2000个开花分株的种群，可以最好地确保毛lo的生存能力。 [参考：53]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号