Highly individualistic rates of plant phenological advance associated with arctic sea ice dynamics
Highly individualistic rates of plant phenological advance associated with arctic sea ice dynamics
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DOI：
10.1098/rsbl.2016.0332
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发表时间：
2016-12-01
期刊：
影响因子：
3.3
通讯作者：
Steltzer, Heidi
中科院分区：
文献类型：
--
作者：
Post, Eric;Kerby, Jeffrey;Steltzer, Heidi
我们分析了12年的物种特定的出现日期的植物在低北极地区附近的Kangerlussuaq，格陵兰岛，调查与海冰动态，一个潜在的贡献者，当地的温度变化在近海岸苔原。物种表现出高度可变的物候提前率，从最大的-2.55 +/- 0.17和-2.93 +/- 0.51天/年（-1）的禾本科和杂类草，分别为最小的-0.55 +/- 0.19天/年（-1）或没有提前在两个落叶灌木物种。每月北极范围内的海冰范围是一个显着的预测出现的时间在14种。尽管物种之间的进展率的变化，这些利率一般是最大的最早出现的物种，每月海冰范围也是出现的主要预测。物种之间的变化在物候提前率重新洗牌的物候群落，落叶灌木叶逐渐晚于杂类草和禾本科。由于早期物种比晚期物种更快地前进，因为出现物候与海冰动态相关的物种的前进速度最大，加速海冰下降可能有助于在这个社区的早期和晚期新兴物种之间的进一步分歧。
We analysed 12 years of species-specific emergence dates of plants at a Low-Arctic site near Kangerlussuaq, Greenland to investigate associations with sea ice dynamics, a potential contributor to local temperature variation in near-coastal tundra. Species displayed highly variable rates of phenological advance, from a maximum of -2.55 +/- 0.17 and -2.93 +/- 0.51 d yr(-1) among a graminoid and forb, respectively, to a minimum of -0.55 +/- 0.19 d yr(-1) or no advance at all in the two deciduous shrub species. Monthly Arctic-wide sea ice extent was a significant predictor of emergence timing in 10 of 14 species. Despite variation in rates of advance among species, these rates were generally greatest in the earliest emerging species, for which monthly sea ice extent was also the primary predictor of emergence. Variation among species in rates of phenological advance reshuffled the phenological community, with deciduous shrubs leafing out progressively later relative to forbs and graminoids. Because early species advanced more rapidly than late species, and because rates of advance were greatest in species for which emergence phenology was associated with sea ice dynamics, accelerating sea ice decline may contribute to further divergence between early-and late-emerging species in this community.