Climatic and biotic velocities for woody taxa distributions over the last 16 000 years in eastern North America.
Climatic and biotic velocities for woody taxa distributions over the last 16 000 years in eastern North America.
复制标题
过去 16000 年北美东部木本类群分布的气候和生物速度。
DOI：
10.1111/ele.12110
复制
发表时间：
2013
期刊：
影响因子：
8.8
通讯作者：
John W. Williams
中科院分区：
文献类型：
--
作者：
Alejandro Ordonez;John W. Williams
我们使用化石花粉记录网络估计了过去16,000年来30个木本植物分类群核心分布的南北边界的纬向速度(公里/十年)(生物速度)，并将这些速度与CCSM3模拟估计的气候速度进行了比较。生物速度在温度快速变化时期(即16至7千卡)比相对稳定时期(即7至1千卡)更快，南北边界向北移动一致。对于大多数分类群来说，在12至7 GHz之间，北部边界的生物速度快于南部边界，导致分布范围扩大。就单个时间段而言，生物速度与使用多变量方法计算的气候速度一样快或更快。这些结果表明，气候变化加快了北部和南部人口分布变化的速度，同时表明北部人口更加敏感。在21世纪的气候变化下，预计也会出现类似的敏感度和节奏。
We estimated the latitudinal velocity (km/decade) of northern and southern boundaries of core distributions for 30 woody taxa over the last 16 000 years (biotic velocities) using networks of fossil pollen records, and compared these with climate velocities estimated from CCSM3 simulations. Biotic velocities were faster during periods of rapid temperature change (i.e. 16 to 7 ka) than times of relative stability (i.e. 7 to 1 ka), with a consistent northward movement of northern and southern boundaries. For most taxa, biotic velocities were faster for northern than for southern boundaries between 12 and 7 ka, resulting in expanding distributions. For individual time periods, biotic velocities were as fast or faster than climate velocities calculated using multivariate approaches. These results indicate that climate change paced the rate of distribution shifts in both northern and southern populations while suggesting that northern populations were more sensitive. A similar sensitivity and pacing is expected under 21st century climate change.