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首页> 外文期刊>Plant biology >Impact of prairie fragment size on proportion of females and reproductive success of Lobelia spicata Lam., a gynodioecious species
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Impact of prairie fragment size on proportion of females and reproductive success of Lobelia spicata Lam., a gynodioecious species

机译：草原片段规模对雌雄同体林株林和生殖成功的影响。，一种营养物种

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Due to ongoing human impacts, plant species increasingly occur in landscapes that are highly fragmented, with remaining natural habitats occupying small areas, resulting in populations that are smaller and more isolated than in previous time periods. This changed metapopulation structure is expected to have negative impacts on seed production. For example, the proportion of female plants within gynodioecious populations may be more volatile due to genetic drift in small populations associated with small habitat fragments, with concomitant impacts on seed production. My aims were to determine: (i) if variation in proportion of females is larger in smaller fragments; and (ii) if such changes in female frequency in small fragments result in reduced seed production. Thirty-two populations of Lobelia spicata Lam., a gynodioecious species, were surveyed in 2000, 2001 and 2009 in the tallgrass prairie region of Midwestern North America (Illinois and Indiana, USA). Data were collected for: proportion of female plants, total number of flowering plants (measure of population size), seed set per plant and prairie fragment size (another measure of population size). The proportion of females is more variable in smaller prairie fragments. Seed number per fruit decreases as the proportion of females increases in a population, but only significantly for female plants. The number of flowering plants is positively associated with fruit production for both genders. Populations within larger prairie fragments have higher seed production. The reproductive consequences of habitat fragmentation depend on the plant breeding system. While both sexes were negatively impacted, females were more adversely affected.
机译：由于持续的人类影响，植物物种越来越多地发生在高度碎片的景观中，其余的自然栖息地占据了小区域，导致群体较小，比以前的时间较小。这种改变的比例结构预计对种子生产产生负面影响。例如，由于与小栖息地碎片相关的小群体中的遗传漂移，雌性植物中的雌植物的比例可能更挥发，伴随着种子生产的伴随地位。我的目标是确定：（i）如果较小的碎片比例大的变化更大; （ii）如果小片段中的女性频率的这种变化导致种子生产减少。 32人的Lobelia Spicata Lam群体。2000年，2001年和2009年在北美洲中西部（伊利诺伊州和印第安纳州）的Tallgrass Prairie地区进行了调查。收集数据：女性植物的比例，开花植物的总数（群体大小的衡量标准），种子套装，种子簇和草原片段大小（群体大小的另一种衡量标准）。女性的比例在较小的草原片段中更具变量。随着女性的比例在人口中增加，种子数量减少，但仅适用于女性植物。开花植物的数量与两种性别的果实产量正相关。较大的草原片段内的种群具有更高的种子生产。栖息地破碎物的生殖后果依赖于植物育种系统。虽然两性都受到负面影响，但女性受到更大的不利影响。

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