Moving front or population expansion:: How did Picea abies (L.) Karst. become frequent in central Sweden?
Moving front or population expansion:: How did Picea abies (L.) Karst. become frequent in central Sweden?
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DOI：
10.1016/j.quascirev.2005.03.002
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发表时间：
2005-12-01
影响因子：
4
通讯作者：
Giesecke, T
中科院分区：
文献类型：
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作者：
Giesecke, T
在瑞典中部四个湖泊附近的全新世云杉树的增加是通过扩展花粉计数来分析的，这些部分包括频繁但不连续的出现的尾部和连续曲线的开始。通过模拟简单的景观场景来测试冷杉冷杉在斯堪的纳维亚半岛传播和种群扩张的可能机制。从景观情景中预测的花粉积累率模式与在四个地点观察到的模式进行了比较，以探索观察到的曲线是如何产生的。对移动锋情景的模拟表明，花粉积累速率的上升速度要快于4个站点观测到的指数和logistic增长。这些地点花粉值呈指数增长，很可能是由于当地种群的增加。然而，人口增长的地理位置可能会影响曲线的形状。经验和模型的结果进行了讨论，以获得新的见解的模式和过程的传播在瑞典中部的婴儿。生殖压力和自交受精被认为可能解释了为什么在冷杉的区域扩张之前可能存在的小前哨种群没有更早地扩张。(c) 2005 Elsevier Ltd版权所有。
The Holocene increase in Picea abies around four central Swedish lakes was analysed using extended pollen counts over the sections comprising the tail of frequent, but discontinuous, occurrences and the beginning of the continuous curve. Simple landscape scenarios were simulated to test possible mechanisms of the spread and population expansion of P. abies in Scandinavia. Predicted patterns of pollen accumulation rates from the landscape scenarios were compared to patterns observed at the four sites to explore how the observed curves could have come about. Simulations of a moving front scenario indicate that pollen accumulation rates should rise faster than the exponential and logistic increase observed at the four sites. Exponential increase of pollen values at the sites is most likely due to locally increasing populations. However, the geography of expanding populations may influence the shape of the curve. Empirical and model results are discussed to gain new insights into the pattern and processes of the spread of P abies in central Sweden. Propagule pressure and self-fertilisation are considered as possible explanations of why small outpost populations that may have existed before the regional expansion of P. abies did not expand earlier. (c) 2005 Elsevier Ltd. All rights reserved.