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首页> 外文期刊>International journal of plant sciences >CONFLICTING SELECTIVE FORCES UNDERLYING SEED DISPERSAL IN THE ENDANGERED PLANT SILENE DICLINIS
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CONFLICTING SELECTIVE FORCES UNDERLYING SEED DISPERSAL IN THE ENDANGERED PLANT SILENE DICLINIS

机译：在濒临灭绝的植物硅藻中，在种子分散下使选择力冲突

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Selective pressures underlying the distance of seed dispersal in Silene diclinis were evaluated in natural populations. We expected that high seed predation and high seedling density around mother plants would favor relatively long-distance dispersal and that microhabitat conditions might favor short-distance dispersal. We experimentally altered seed density and seed dispersal distance and found that seed predation by ants increased with density but not with distance. Observations of naturally occurring seedlings showed that their survival probability was higher at lower density and when closer to female plants. Overall, calculated cumulative survival probabilities (including both seed predation and seedling survival) favored limited dispersal. Observations of naturally occurring seedlings and adults showed a strongly clumped spatial population structure. Selection for reduced dispersal and the resulting reduction of colonization ability make S. diclinis populations extremely sensitive to environmental stochasticity, and in the long run, this could contribute to the extinction of this endangered species as a consequence of changing land-use patterns.
机译：在自然种群中评估了在小二烯中种子传播距离的基础上的选择压力。我们预期母本植物周围较高的种子捕食和较高的幼苗密度将有利于相对长距离的分散，而微生境条件可能有利于短距离的分散。我们通过实验改变了种子的密度和种子的传播距离，发现蚂蚁对种子的捕食随着密度的增加而增加，而不是随着距离的增加而增加。对天然存在的幼苗的观察表明，在较低密度和靠近雌性植物时，它们的存活概率较高。总体而言，计算的累积生存概率（包括种子捕食和幼苗生存）都有利于有限的分散。对自然发生的幼苗和成年的观察表明，空间种群结构非常拥挤。选择减少扩散的方法和随之而来的定植能力降低使二齿链球菌种群对环境随机性极为敏感，从长远来看，由于土地利用方式的改变，这可能导致该濒危物种的灭绝。

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