Synchronous flowering despite differences in snowmelt timing among habitats of Empetrum hermaphroditum
Synchronous flowering despite differences in snowmelt timing among habitats of Empetrum hermaphroditum
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DOI：
10.1016/j.actao.2015.10.005
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发表时间：
2015-11-01
影响因子：
1.8
通讯作者：
Eckstein, R. Lutz
中科院分区：
文献类型：
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作者：
Bienau, Miriam J.;Kroencke, Michael;Eckstein, R. Lutz
北极-高寒地区地形异质性强，积雪分布格局多样，春季融雪时间不同。这可能会影响北极和高山植物物种的物候发育，而非同步开花可能会促进植物对当地环境的适应。本文研究了优势矮灌木雌雄同体（Empetrum hermaphroditum）的开花物候在冬季积雪深度和春季融雪时间不同的3种生境（露脊、遮蔽洼地和白桦林）中的变化，以及在3个不同研究区域中观察到的模式是否一致。尽管不同生境间融雪时间存在显著差异，但雌雄同体开花在不同生境间几乎是同步的，这表明雌雄同体开花存在高度重叠。我们的数据表明，在融雪和开花之间有较长滞后期的暴露脊与融雪和开花之间的两个后期融化栖息地相比，经历了不同的温度和光照条件。我们的研究表明，融雪时间的年际差异似乎比小尺度变化对Empetrum开花的影响更小。(C) 2015 Elsevier Masson SAS。版权所有。
The topography within arctic-alpine landscapes is very heterogeneous, resulting in diverse snow distribution patterns, with different snowmelt timing in spring. This may influence the phenological development of arctic and alpine plant species and asynchronous flowering may promote adaptation of plants to their local environments.We studied how flowering phenology of the dominant dwarf shrub Empetrum hermaphroditum varied among three habitats (exposed ridges, sheltered depressions and birch forest) differing in winter snow depth and thus snowmelt timing in spring, and whether the observed patterns were consistent across three different study areas.Despite significant differences in snowmelt timing between habitats, full flowering of E. hermaphroditum was nearly synchronous between the habitats, and implies a high flowering overlap. Our data show that exposed ridges, which had a long lag phase between snowmelt and flowering, experienced different temperature and light conditions than the two late melting habitats between snowmelt and flowering.Our study demonstrates that small scale variation seems matter less to flowering of Empetrum than interannual differences in snowmelt timing. (C) 2015 Elsevier Masson SAS. All rights reserved.