Community traits affect plant–plant interactions across climatic gradients
Community traits affect plant–plant interactions across climatic gradients
复制标题
群落特征影响跨气候梯度的植物间相互作用
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Harrison
中科院分区：
文献类型：
--
作者：
Stella M. Copeland;S. Harrison
植物的丰度和种群数量通常会随着环境压力的变化而沿着变化，而邻近的植物可以放大或缩小这种变化。我们问到在多大程度上的影响，邻近的植物对一个焦点物种可以解释的性状和丰富度的物种在周围的社区。我们研究了一种常见的林下草本植物，Trientalis latifolia，跨越由俄勒冈州西南部锡斯基尤山脉地形造成的气候梯度。我们比较了Trientalis健身沿着这些梯度与邻居删除，并询问是否可以预测其社区加权性状值和丰度的影响相邻的植物。环境条件本身并不能解释邻居是否对Trientalis有竞争或促进作用。然而，环境与邻居性状和生物量的相互作用，影响邻居效应：在凉爽，高海拔，高邻居生物量与较强的促进作用，而在温暖，低海拔，高邻居的差异与较强的竞争效应。我们认为，环境和群落特征之间的协变和相互作用是理解物种性能沿着气候梯度的关键。
Plant abundances and demography often vary along gradients of environmental stress, and neighboring plants can amplify or diminish such variation. We asked to what degree the effects of neighboring plants on a focal species can be explained by the traits and abundances of species in the surrounding community. We studied a common understory herb, Trientalis latifolia, across climatic gradients created by topography in the Siskiyou Mountains, southwestern Oregon. We compared Trientalis fitness along these gradients with and without neighbor removal, and asked whether the effects of neighboring plants could be predicted by their community-weighted trait values and abundances. Environmental conditions alone did not explain whether neighbors had competitive or facilitative effects on Trientalis. However, the environment interacted with neighbor traits and biomass to influence neighbor effects: at cool, higher elevations, high neighbor biomass was associated with stronger facilitative effects, while at warm, lower elevations, high neighbor dissimilarity from Trientalis was associated with stronger competitive effects. We suggest that covariation and interactions among environmental and community characteristics are key to understanding species performance along climatic gradients.