US Geological Survey, Western Ecological Research Center, Three Rivers, CA 93271, USA.
Science. 2011 Oct 14;334(6053):177; author reply 177. doi: 10.1126/science.1205740.
Crimmins et al. (Reports, 21 January 2011, p. 324) attributed an apparent downward elevational shift of California plant species to a precipitation-induced decline in climatic water deficit. We show that the authors miscalculated deficit, that the apparent decline in species' elevations is likely a consequence of geographic biases, and that unlike temperature changes, precipitation changes should not be expected to cause coordinated directional shifts in species' elevations.
克里明斯等人（报告，2011 年 1 月 21 日，第 324 页）认为，加利福尼亚植物物种的明显海拔下降归因于降水引起的气候水分亏缺减少。我们表明，作者计算有误，物种海拔的明显下降可能是地理偏差的结果，而且与温度变化不同，降水变化不应导致物种海拔的协调方向变化。
