Genetic evidence for a Janzen-Connell recruitment pattern in reproductive offspring of Pinus halepensis trees.

Effective seed dispersal, combining both dispersal and post-dispersal (establishment) processes, determines population dynamics and colonization ability in plants. According to the Janzen-Connell (JC) model, high mortality near the mother plant shifts the offspring establishment distribution farther away from the mother plant relative to the seed dispersal distribution. Yet, extending this prediction to the distribution of mature (reproductive) offspring remains a challenge for long-living plants. To address this challenge we selected an isolated natural Aleppo pine (Pinus halepensis) population in Mt. Pithulim (Israel), expanded from five ancestor trees in the beginning of the 20th century into ~2000 trees today. Using nine microsatellite markers, we assigned parents to trees established during the early stages of population expansion. To elucidate the effect of the distance from mother plant on post-dispersal survival, we compared the effective seed dispersal kernel, constructed based...

兼具扩散与扩散后（定植）过程的有效种子扩散，决定了植物的种群动态与定殖能力。根据杨森-康奈尔模型（Janzen-Connell model, JC），相较于种子扩散分布，母株附近的高死亡率会使子代定植分布向远离母株的方向偏移。然而，将这一预测推广至成熟（可繁殖）子代的分布情况，对于长寿植物而言仍是一项挑战。为解决这一难题，我们选取了以色列皮图勒姆山一处孤立的天然阿勒颇松（Pinus halepensis）种群，该种群于20世纪初由5株祖先树木发展而来，如今已增至约2000株。我们利用9个微卫星标记（microsatellite markers），对种群扩张早期定植的林木进行了亲本归属鉴定。为阐明母株距离对扩散后存活的影响，我们对比了基于……构建的有效种子扩散核（seed dispersal kernel）。