Edaphic specialization and vegetation zones define elevational range-sizes for Mt Kinabalu regional flora
Edaphic specialization and vegetation zones define elevational range-sizes for Mt Kinabalu regional flora
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土壤专业化和植被带定义了基纳巴卢山区域植物群的海拔范围大小
DOI：
10.1111/ecog.05873
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发表时间：
2021
期刊：
影响因子：
5.9
通讯作者：
Russo SE
中科院分区：
文献类型：
--
作者：
Whitman M;Beaman RS;Repin R;Kitayama K;Aiba S;Russo SE
确定限制物种发生的物理和生态边界对于预测这些物种如何应对全球变化非常重要。婆罗洲岛拥有广泛的栖息地，这些栖息地是地球上最丰富的栖息地之一，使其成为研究物种分布广泛模式背后的生态机制的理想地点。我们以婆罗洲基纳巴卢山海拔梯度为中心，利用193科的3060种植物，测试了丰富度和范围大小与地形专门化和植被带边界的关系。在物种间，平均范围大小随海拔升高而增加，与Rapoport规则一致。然而，与土壤关联随机化的零模型相比，与营养和水分利用率低且重金属浓度高的超镁铁质土壤相关的植物在海拔梯度上的分布范围和丰富度比预期的要大。相反，非超镁铁质物种的分布范围和丰富度比预期的要小。这些结果表明，对资源限制的耐受性可能与更大的范围大小有关，而对土壤胁迫不耐受的物种可能具有更窄的范围大小，这可能是由于在有利的土壤类型中竞争更激烈。使用海拔作为平均范围大小的预测因子，我们发现在植被带过渡时具有断点的分段模型比不包含生态边界的模型更能解释物种分布。在山地云林植被带中，海拔高度对范围大小的相对增加最大。在一个没有物理边界的地区，平均范围的扩大可能表明生态策略的转变以及生物与非生物压力源的重要性。我们的研究结果表明，海拔范围大小格局是由物种的地理关联等生态约束因素构成的，这可能限制了物种为响应气候变化而向上或向下迁移的能力。
Identifying physical and ecological boundaries that limit where species can occur is important for predicting how those species will respond to global change. The island of Borneo encompasses a wide range of habitats that support some of the highest richness on Earth, making it an ideal location for investigating ecological mechanisms underlying broad patterns of species distribution. We tested variation in richness and range‐size in relation to edaphic specialization and vegetation zone boundaries using 3060 plant species from 193 families centered around the elevational gradient of Mt Kinabalu, Borneo. Across species, average range‐size increased with elevation, consistent with Rapoport's rule. However, plants associated with ultramafic soil, which is low in nutrient and water availability and often has high concentrations of heavy metals, had larger range‐sizes and greater richness than expected along the elevational gradient, as compared to a null model with randomization of edaphic association. In contrast, non‐ultramafic species had smaller range‐sizes and lower richness than expected. These results suggest that tolerance of resource limitation may be associated with wider range‐sizes, whereas species intolerant of edaphic stress may have narrower range‐sizes, possibly owing to more intense competition in favorable soil types. Using elevation as a predictor of average range‐sizes, we found that piece‐wise models with breakpoints at vegetation zone transitions explained species distributions better than models that did not incorporate ecological boundaries. The greatest relative increases in range‐size with respect to elevation occurred mid‐elevation, within the montane cloud forest vegetation zone. Expansion of average range‐size across an area without physical boundaries may indicate a shift in ecological strategy and importance of biotic versus abiotic stressors. Our results indicate that elevational range‐size patterns are structured by ecological constraints such as species' edaphic association, which may limit the ability of species to migrate up or down mountains in response to climate change.