Tree species diversity increases with conspecific negative density dependence across an elevation gradient,Ecology Letters

当前位置： X-MOL 学术 › Ecol. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Tree species diversity increases with conspecific negative density dependence across an elevation gradient
Ecology Letters ( IF 7.6 ) Pub Date : 2022-03-15 , DOI: 10.1111/ele.13996
Joseph A LaManna ₁ , F Andrew Jones _{2,

3} , David M Bell ₄ , Robert J Pabst ₅ , David C Shaw ₆

Affiliation

Elevational and latitudinal gradients in species diversity may be mediated by biotic interactions that cause density-dependent effects of conspecifics on survival or growth to differ from effects of heterospecifics (i.e. conspecific density dependence), but limited evidence exists to support this. We tested the hypothesis that conspecific density dependence varies with elevation using over 40 years of data on tree survival and growth from 23 old-growth temperate forest stands across a 1,000-m elevation gradient. We found that conspecific-density-dependent effects on survival of small-to-intermediate-sized focal trees were negative in lower elevation, higher diversity forest stands typically characterised by warmer temperatures and greater relative humidity. Conspecific-density-dependent effects on survival were less negative in higher elevation stands and ridges than in lower elevation stands and valley bottoms for small-to-intermediate-sized trees, but were neutral for larger trees across elevations. Conspecific-density-dependent effects on growth were negative across all tree size classes and elevations. These findings reveal fundamental differences in biotic interactions that may contribute to relationships between species diversity, elevation and climate.

中文翻译：

树种多样性随着海拔梯度的同种负密度依赖性而增加

物种多样性的高程和纬度梯度可能由生物相互作用介导，导致同种生物对生存或生长的密度依赖性影响不同于异种生物的影响（即同种密度依赖性），但支持这一点的证据有限。我们使用超过 40 年的 23 座古老温带森林跨越 1,000 米海拔梯度的树木存活和生长数据检验了同种密度依赖性随海拔变化的假设。我们发现，在较低海拔、较高多样性的森林林分通常以较高的温度和较高的相对湿度为特征，对中小型焦点树的生存的同种密度依赖性影响是负面的。对于中小型树木，高海拔林分和山脊对生存的同种密度依赖性影响比低海拔林分和谷底的负面影响要小，但对于海拔较高的较大树木而言，这种影响是中性的。在所有树木大小等级和海拔高度上，同种密度相关的生长影响都是负面的。这些发现揭示了生物相互作用的根本差异，这可能有助于物种多样性、海拔和气候之间的关系。

更新日期：2022-03-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11