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Plant reproductive interval and population density in aseasonal tropics

机译：季节性热带植物的繁殖间隔和种群密度

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摘要

In some tropical areas, annual cycles in the environment and plant phenology are not clearly detectable. In such aseasonal tropics, it was found that plant population density is associated with flowering intervals within the same habitats and within the same pollination guilds, if some conditions are satisfied. This finding is based on observations of flowering phenology of butterfly-pollinated understory shrubs of the genus Ixora (Rubiaceae) for 36 months in a mixed dipterocarp forest in Sarawak, northwest Borneo. Plants did not receive sufficient pollination services and fruit set was pollination-limited. Under such conditions, it is theoretically predicted that the plant types that reproduce frequently would have higher population density than those that reproduce less frequently, because common types must avoid competition for pollinators and rare types can have a large floral display by storing resources during long reproductive intervals to attract pollinators efficiently. Observed relationships among plant reproductive intervals, pollinator attractions and population densities in Ixora are consistent with theoretical predictions. Based on the theory proposed in this paper, I discuss a factor promoting diversification of the genus Ixora and other taxa.
机译：在某些热带地区，环境和植物物候的年度周期无法清楚地检测到。在这样的季节性热带地区，如果满足某些条件，就会发现植物种群密度与相同生境和相同授粉行会内的开花间隔有关。该发现是基于婆罗洲西北砂拉越的混合双香果林中Ixora（Rubiaceae）蝴蝶授粉的地下灌木的开花物候36个月的观察结果。植物没有得到足够的授粉服务，坐果有限。在这种条件下，理论上预测，经常繁殖的植物类型将比不经常繁殖的植物类型具有更高的种群密度，因为常见类型必须避免与传粉媒介竞争，而稀有类型可以通过在长期繁殖期间储存资源而具有较大的花香。间隔以有效吸引传粉媒介。 Ixora中植物繁殖间隔，传粉媒介吸引力和种群密度之间的相关关系与理论预测相符。基于本文提出的理论，我讨论了促进Ixora属和其他类群多样化的因素。

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