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How does spatial heterogeneity affect inter- and intraspecific growth patterns in tundra shrubs?
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-09-28 , DOI: 10.1111/1365-2745.13784 Svenja Dobbert 1 , Roland Pape 2 , Jörg Löffler 1
中文翻译：
空间异质性如何影响苔原灌木的种间和种内生长模式？
更新日期：2021-09-28
Journal of Ecology ( IF 5.3 ) Pub Date : 2021-09-28 , DOI: 10.1111/1365-2745.13784 Svenja Dobbert 1 , Roland Pape 2 , Jörg Löffler 1
Affiliation
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- Arctic and alpine ecosystems are strongly affected by rapidly changing environmental conditions, resulting in profound vegetation shifts, which are highly heterogeneous and hard to predict, yet have strong global impacts. Shrubs have been identified as a key driver of these shifts. In this study, we aim to improve the understanding of how such broad-scale vegetation changes are locally impacted by inter- and intraspecific plasticity and topographically driven heterogeneity in microsite conditions.
- We assessed continuous stem diameter variation of three dominant tundra shrub species at daily resolution during 5 years, using high-precision dendrometers, thus bridging the gap between classical dendroecology and plant physiology. From this data, we identified distinct growth patterns which we linked to microsite environmental drivers.
- The observed patterns appeared highly variable depending on site and species, strongly influenced by characteristics of the individual plant. As the main driver of this variability, we identified fine-scale topographic complexity, causing the sampled specimens to adjust locally by developing distinct growth strategies. We found these strategies strongly related to snow-cover variation and associated freezing and thawing. Predicted changes in winter conditions and associated snow regimes will therefore have strong effects on shrub growth and community structure, yet, these effects are highly complex and not uniform in direction.
- Synthesis. The ability to adapt in a heterogeneous environment appeared highly differentiated between species and closely connected to intraspecific plasticity. Here, we identified spatial variability related to local topography as a main indicator for potential future redistribution and niche shifts in response to environmental change.
中文翻译：
空间异质性如何影响苔原灌木的种间和种内生长模式？
- 北极和高山生态系统受到快速变化的环境条件的强烈影响，导致植被发生深刻变化，这些变化高度异质且难以预测，但具有强大的全球影响。灌木已被确定为这些转变的关键驱动因素。在这项研究中，我们旨在提高对这种大尺度植被变化如何受到种间和种内可塑性以及微型场地条件下地形驱动异质性的局部影响的理解。
- 我们使用高精度树状计在 5 年内以每日分辨率评估了三种主要苔原灌木物种的连续茎直径变化，从而弥合了经典树木生态学和植物生理学之间的差距。从这些数据中，我们确定了与微型站点环境驱动因素相关的不同增长模式。
- 观察到的模式似乎因地点和物种而异，受单个植物特征的强烈影响。作为这种可变性的主要驱动因素，我们确定了精细的地形复杂性，通过制定不同的生长策略导致采样标本在局部进行调整。我们发现这些策略与积雪变化和相关的冻融密切相关。因此，冬季条件和相关雪情的预测变化将对灌木生长和群落结构产生强烈影响，但这些影响高度复杂且方向不统一。
- 合成。适应异质环境的能力似乎在物种之间高度分化，并且与种内可塑性密切相关。在这里，我们将与局部地形相关的空间变异性确定为未来潜在重新分布和生态位变化以响应环境变化的主要指标。
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